FieldsMagnetic properties in condensed matter

Exploring Electronic States in BEDT-TTF Organic Superconductors

This review, published in the Journal of the Physical Society of Japan, provides a comprehensive summary of the electronic states observed in BEDT-TTF type organic superconductors, including metal-insulator transitions, Mottness transitions, non-Fermi liquids, quantum spin liquids, and Bose-Einstein condensation.

Superconductivity

Electronic transport in condensed matter

Magnetic properties in condensed matter

Variety of Mechanically Induced Spin Currents in Rashba Systems

Various types of spin currents, including unconventional types, are generated in Rashba spin-orbit coupled systems by dynamic lattice distortions associated with, for example, surface acoustic waves.

Electronic transport in condensed matter

Magnetic properties in condensed matter

Structure and mechanical and thermal properties in condensed matter

Current Melt Frozen Electrons

The origin of the current-induced insulator-to-metal transition of samarium monosulfide was explained by the 4f−5d hybridization observed using optical reflectivity and photoelectron spectroscopies.

Dielectric, optical, and other properties in condensed matter

Magnetic properties in condensed matter

Towards Uncovering the Hidden Order of URu₂Si₂ Phase Transition

We propose a chiral charge as the hidden order parameter in URu₂Si₂ and present experiments to detect it by focusing on breakings of mirror and inversion symmetries at the local uranium ion.

Magnetic properties in condensed matter

Electronic structure and electrical properties of surfaces and nanostructures

Magnetic Excitation in S = 1/2 Antiferromagnetic Chain CsCoCl₃ with Ising-Like Exchange Interaction

The results of high-field electron spin resonance measurements in the millimeter-wave to terahertz region reveal unconventional magnetic excitation in S = 1/2 one-dimensional antiferromagnets.

Magnetic properties in condensed matter

Strange Elastic Anomalies with Ultraslow Dynamics around Magnetic Critical Endpoint

Near the magnetic critical endpoint of UCoAl, peculiar elastic anomalies exhibiting exotic ultraslow dynamics arising from electric quadrupoles are indicated. Combining this with diverse fluctuations, intriguing phenomena and exotic ground states are expected.

Structure and mechanical and thermal properties in condensed matter

Magnetic properties in condensed matter

Study of Unconventional Slow Critical Dynamics of the Frustrated Magnet DyRu₂Si₂ ~Spontaneous Alignment of Emergent Ferromagnetic Spin Textures?~

We measured the ac susceptibility of the frustrated magnet DyRu₂Si₂, in the partially ordered phase, where emergent 2-dimensional (2-D) disordered planes appear, and revealed extraordinarily slow and unconventional dynamics, which could be attributed to the highly fluctuating nature of the emergent 2-D planes.

Magnetic properties in condensed matter

Dzyaloshinskii–Moriya Interactions in Magnetism, Electricity, and Electronics

A collection of papers in the Journal of the Physical Society of Japan advances our understanding of Dzyaloshinskii–Moriya interaction and paves the way for developing next generation computing and electronic systems.

Magnetic properties in condensed matter

Electron states in condensed matter

Dielectric, optical, and other properties in condensed matter

Antisymmetric Exchange Interaction Selects the Cycloidal Helicity: Observation by Resonant X-ray Diffraction

The unique sense of rotation of the cycloidal magnetic order was clarified in noncentrosymmetric EuIrGe₃ by using circularly polarized resonant x-ray diffraction.

Magnetic properties in condensed matter

Ultra Purification Unveils the Intrinsic Nature in Spin-Triplet Superconductor UTe₂

Microscopic spin-susceptibility measurements in ultra-pure UTe₂ samples reveal that superconducting symmetry is analogous to the superfluidity of the ³He B-phase and that U deficiency has a significant impact on superconducting properties.

Superconductivity

Magnetic properties in condensed matter

Heavy Fermion Meets Antiferromagnetic Sea

CeMnSi exhibits heavy fermion behaviors in an antiferromagnetically ordered state of Mn.
The space-time inversion symmetry inherent in the ordered state is key for the unique electron state.

Magnetic properties in condensed matter

Possible New State in CeB₆ Uncovered by Extremely Low-Frequency Nuclear Quadrupole Resonance Experiments

Extremely low-frequency nuclear quadrupole resonance analyses of CeB₆, a prototypical antiferroquadrupole (AFQ) material, indicate the possible existence of a new state in the zero-field AFQ ordered phase.

Magnetic properties in condensed matter

Non-Trivial Superconductivity in the Semimetal EuAuBi

　Magnetic order and superconductivity coexist in a noncentrosymmetric topological semimetal, EuAuBi. EuAuBi exhibits a large, anisotropic critical field with Rashba spin–orbit coupling, which can help develop superconducting spintronic materials.

Superconductivity

Magnetic properties in condensed matter

Hidden Magnetoelectric Phase Transition by Emergent Staggered Magnetic Field

Emergent staggered magnetic fields induce phase transition in the multiferroic material Ba₂FeSi₂O₇.
This study established a design principle utilizing emergent staggered magnetic fields to obtain an enhanced physical response.

Magnetic properties in condensed matter

Thickness-Dependent Oscillation Behavior of Magnetic Phase Transitions in Pt Ultrathin Films with Small Orbital Moment

Ferromagnetism in nano-Pt films originates from the quantum-confinement effect that depends on film thickness. Studies of the electronic states of nano-Pt will aid in developing methods for efficiently utilizing its large spin-orbit coupling.

Magnetic properties in condensed matter

High Magnetic Field as a Tool for Discovery in Condensed Matter Physics

The Journal of the Physical Society of Japan highlights in this special topic recent advances in modern physics that have been realized with the generation of pulsed high magnetic fields.

Magnetic properties in condensed matter

Dielectric, optical, and other properties in condensed matter

Electronic transport in condensed matter

Structure and mechanical and thermal properties in condensed matter

Electron states in condensed matter

Electronic structure and electrical properties of surfaces and nanostructures

Measurement, instrumentation, and techniques

Understanding the Obscure Antiferromagnetism in α-Mn by Nuclear Magnetic Resonance

Although Mn is an elementary metal, the antiferromagnetic state of α-Mn is still obscure. Our NMR study on high-quality α-Mn provides new insights into the symmetry of its antiferromagnetism.

Magnetic properties in condensed matter

Origin of Metamagnetic Transition (MMT) in the Spin-Triplet Superconductivity in UTe₂

State-of-the-art magnetostriction measurements in a pulsed-magnetic field reveal the origin of a metamagnetic transition of spin-triplet superconductor UTe₂. We propose that the uranium valence fluctuation plays a crucial role in its metamagnetic and superconducting transitions.

Superconductivity

Magnetic properties in condensed matter

Unraveling the Unique Properties of Icosahedral Quasicrystals

Scientists review the magnetism, non-Fermi liquid behavior, and quantum critical behavior observed in icosahedral quasicrystals (QCs), and compare these properties with that of heavy fermions and approximant crystals.

Magnetic properties in condensed matter

Structure and mechanical and thermal properties in condensed matter

Cross-disciplinary physics and related areas of science and technology

Tensor Networks Across Physics

Researchers from Japan provide the first comprehensive review of the historical development of tensor networks from a statistical mechanics viewpoint, with a focus on its theoretical background.

Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling

Statistical physics and thermodynamics

Magnetic properties in condensed matter

Realizing Spin Liquids Experimentally with Kapellasite-type Quantum Kagome Antiferromagnet

This study reports the observation of the spin fluctuation in a quantum kagome antiferromagnet CaCu₃(OH)₆Cl₂·0.6H₂O which persists down to 82 mK using the μSR technique.

Magnetic properties in condensed matter

Shedding Light on Nonreciprocal Directional Dichroism at High Magnetic Fields in a Multiferroic Material

Large optical nonreciprocal directional dichroism, coupled with an antiferromagnetic order parameter, is observed in a high magnetic field via magneto-optical spectroscopy combined with a pulse magnet technique.

Dielectric, optical, and other properties in condensed matter

Magnetic properties in condensed matter

Spin-Wave Dynamics in Antiferromagnets under Electric Current

Electric current causes a Doppler effect in spin waves in ferromagnets through a spin-transfer torque. We report that antiferromagnets allow two such spin-transfer torques and present a microscopic analysis that interpolates ferro- and antiferromagnetic transport regimes.

Electronic transport in condensed matter

Magnetic properties in condensed matter

Exploring the Basic Principles and Functionalities of Spintronic Thermal Management

Scientists propose a new spin caloritronics concept called “spintronic thermal management” and provide a comprehensive overview of basic principles, physical behaviors, and heat control functionalities associated with the concept.

Magnetic properties in condensed matter

Structure and mechanical and thermal properties in condensed matter

The Mysteries of Charge Order and Charge Fluctuations in Cuprate Superconductors

This Special Topics issue condenses the latest research on the enigmatic characteristics of high-temperature superconductivity in cuprates through the observation and elucidation of charge order, charge fluctuations, and other phenomena.

Superconductivity

Dielectric, optical, and other properties in condensed matter

Structure and mechanical and thermal properties in condensed matter

Magnetic properties in condensed matter

Measurements and Implications of Shot Noise in Mesoscopic Systems

Shot noise measurements provide rewarding insights into system properties, non-equilibrium phenomena, and quantum effects in mesoscopic systems.

Electronic transport in condensed matter

Magnetic properties in condensed matter

Superconductivity

Finding Pattern in Randomness: Brownian Motion of Skyrmions

The chiral properties of the Brownian motion of magnetic skyrmions in one- and two-dimensional systems in thermal equilibrium are reported.

Structure and mechanical and thermal properties in condensed matter

Electronic transport in condensed matter

Magnetic properties in condensed matter

Exploring the Physics of Ferrimagnets for Future Spintronics Applications

This Special Topics collection of the Journal of the Physical Society of Japan covers recent progress in spintronics research on ferrimagnetic materials.

Structure and mechanical and thermal properties in condensed matter

Electronic transport in condensed matter

Magnetic properties in condensed matter

Cross-disciplinary physics and related areas of science and technology

Understanding Skyrmion Crystal Formation in EuPtSi

We theoretically demonstrate that the interplay between the spin-charge and spin-orbit couplings in itinerant magnets stabilizes field-direction sensitive, short-period skyrmions. Our results can aid in engineering short-period skyrmions.

Magnetic properties in condensed matter

Will Magnetic Properties near Pressure Induced Quantum Critical Phenomena Be Elucidated?

Hiraoka et al. developed an opposed anvil-type pressure cell for magnetization measurements which combines a large sample space and is capable of generating higher pressures up to 6.3 GPa.

Measurement, instrumentation, and techniques

Magnetic properties in condensed matter

Overlooked Materials Host Rich Physics of Strongly Correlated Electrons

An international team of researchers reviews the research progress on strongly spin-orbit coupled systems, providing an overview of theoretically predicted electronic phases, candidate materials, and unusual experimental observations.

Electron states in condensed matter

Magnetic properties in condensed matter

Electronic transport in condensed matter

Detecting Weak Quantum Magnetism at High Pressures

Improved device and method to measure magnetization under high pressure was developed, which brings a quick tool to screen phases of interest in weakly magnetic materials including quantum magnets.

Measurement, instrumentation, and techniques

Magnetic properties in condensed matter

Electric Quadrupole Orders in f-Electron Systems on the fcc Lattice

We theoretically showed that electric quadrupoles in some heavy fermion materials exhibit a very rich phase diagram including unique partially-ordered phases stabilized by an interaction specific to these systems.

Magnetic properties in condensed matter

Dielectric, optical, and other properties in condensed matter

Statistical physics and thermodynamics

Electronic Nematic Ordering Driven by Atomic-scale Multipoles

Theoretical investigations have unearthed a plethora of electronic nematic orderings driven by the spatial distribution of atomic-scale electric quadrupoles.

Magnetic properties in condensed matter

Dielectric, optical, and other properties in condensed matter

Statistical physics and thermodynamics

BKT Phase Transitions in Magnetic Systems: Formations of Narrow Stripes and Vortex–Antivortex Pairs in a Quasi-2D Ferromagnet K₂CuF₄

Cryogenic Lorentz transmission electron microscopy directly shows that vortex and antivortex pairs emerge in a quasi-two-dimensional ferromagnet K₂CuF₄. This work may reveal the nature of Berezinskii, Kosterlitz, and Thouless phase transition in a magnetic system.

Magnetic properties in condensed matter

Structure and mechanical and thermal properties in condensed matter

Cross-disciplinary physics and related areas of science and technology

Phase Transition and Its Universality Class for a Quantum Spin Chain

We numerically diagonalize the Dimer-Trimer (DT) model Hamiltonian around the SU(3) symmetric point. As a result, we discover the phase transition at this point which belongs to the Berezinskii-Kosterlitz-Thouless (BKT)-like universality class.

Statistical physics and thermodynamics

Magnetic properties in condensed matter

Splitting Walls: Interplay of Different Orders in Multiferroic Materials

We theoretically showed an intrinsic splitting instability of composite domain walls in multiferroic materials under field drive. This instability is a direct result of the coexistence of multiple orders in the system.

Magnetic properties in condensed matter

Statistical physics and thermodynamics

Random Numbers Can Help Solve Difficult Problems in Many-body Physics

Theorists review a random state vector-based description of quantum many-body systems which helps greatly reduce the computational burden involved in their numerical simulations, opening doors to applications in quantum computing.

Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling

Electronic transport in condensed matter

Magnetic properties in condensed matter

Quantum Phase Transition in Spin Dimer Systems

A magnetic moment fluctuates in both longitudinal and transverse directions. The total moment sum rule is a conservation law that can help us resolve data of neutron scattering into the two components.

Magnetic properties in condensed matter

Of Spins and Atoms: Combining Rotations to Obtain Directed Motion

The coupling between surface acoustic waves and spin waves is shown to depend strongly on the angle between the acoustic wavevector and magnetization. For a particular angle, it completely vanishes in one direction, which enables a unidirectional generation of surface acoustic waves by a ferromagnetic resonance.

Magnetic properties in condensed matter

Electromagnetism, optics, acoustics, heat transfer, and classical and fluid mechanics

Under Pressure: Getting the Electronic State of Europium Ions to Changes

Scientists show how pressure and quantum phenomena interplay to alter Europium’s electronic states in a unique manner, opening doors to novel applications in spintronics and technology.

Magnetic properties in condensed matter

On and Off: The Physics Behind Photoswitchable Magnetic Octacyanometalates

We make a major breakthrough in understanding the photoswitchable magnetism in square-antiprismatic octacyanometalates. We reveal that the ``bidirectional” magnetism is accompanied by ``monodirectional electronics” to find a possibility of fabricating multifunctional magnetic devices.

Dielectric, optical, and other properties in condensed matter

Magnetic properties in condensed matter

Taking a Better Look at Data to Predict Exceptional Materials

Instead of regression, the evaluation values to measure the degree of separation of the distributions of the target variable were studied and applied to the magneto crystallineanisotropy of Co/Fe films.

Cross-disciplinary physics and related areas of science and technology

Magnetic properties in condensed matter

Extending Machine Learning to Fermion–Boson Coupled Systems and Excited-State Calculations

We have demonstrated the power of machine learning in representing quantum many-body states accurately. We have extended the applicability of neural-network wave functions and shown their usefulness in fermion-boson-coupled systems and excited-state calculations.

Magnetic properties in condensed matter

Structure and mechanical and thermal properties in condensed matter

Novel Material Shows Unconventional Superconductivity with Magnetic Order Under Pressure

Multiple superconductivity wad found in the novel spin-triplet superconductor UTe₂, which is called “Silicon of Quantum Computers”. A complicated spin-triplet state is realized as a consequence of spin degree of freedom. This result will lead to a new state of topological superconductivity.

Superconductivity

Magnetic properties in condensed matter

Multiple Superconducting Phases in UTe₂: A Complex Analogy to Superfluid Phases of ³He

In quantum liquids, large differences are observed owing to differences in quantum statistics. The physical properties of liquid ³He (Fermion) and ⁴He (Boson) are considerably different at low temperatures. After the discovery of superconductivity in electron (i.e., Fermion) systems, a similar pairing ordered state was expected for ³He. Remarkably, the observed ordered state of ³He was more surprising than expected, multiple superfluid phases in the T–P phase diagram. The origin of the multiple phases was attributed to ferromagnetic interactions in the p-wave symmetry state.

Superconductivity

Magnetic properties in condensed matter