This Special Topics edition of JPSJ details the capabilities and upgrades made to the instruments at JRR-3, since its shutdown after the Great East Japan Earthquake and 2011.

This study clarifies the relationship between magnetic ordering and chiral gauge fields in the ferromagnetic Weyl semimetal Co₃Sn₂S₂, highlighting its spintronic potential using the topological magnetoelectric responses of Weyl fermions.

The correspondence principle states that as quantum numbers approach infinity, the nature of a system described by quantum mechanics should match that described by classical mechanics. Quantum phenomena, such as quantum superposition and quantum correlation, generally become unobservable when a system approaches this regime. Conversely, as quantum numbers decrease, classical descriptions give way to observable quantum effects. The external approach to classical–quantum crossover has attracted research interest. This study aims to demonstrate a method for achieving such control in materials.

In the magnetic skyrmion lattice of non-centrosymmetric EuNiGe₃, the original magnetic helicity, determined by the antisymmetric exchange interaction, is reversed, resulting in a unified helicity.

An investigation using high-quality NbMnP crystals demonstrates that the anomalous Hall conductivity arising from antiferromagnetism is dissipationless, as expected from the intrinsic mechanism.

The ferrotoroidic state, an exotic state of matter with broken space inversion and time-reversal symmetries, was achieved by combining structural rotation and falsely chiral antiferromagnetism in PbMn₂Ni₆Te₃O₁₈.

This study reviews the recent advancements in research of multipole representations for understanding electronic orderings and cross-correlations in materials and presents future research directions.

The multilayered nickelates, La₃Ni₂O₇ and La₄Ni₃O₁₀ , were investigated using nuclear magnetic resonance (NMR) at ambient pressure. Metallic electronic states under the density wave order were observed microscopically for both compounds.

The replica method maps matrix-valued geometric Brownian motion to a mean-field quantum spin system. This correspondence makes it possible to obtain an exact solution for matrix-valued geometric Brownian motion.

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.

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.

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.

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.

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.

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.

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.

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.

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

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.

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.

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 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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

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

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

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.

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.

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.

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.

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.

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

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.

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.

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.

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.

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.

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.