FieldsSuperconductivity

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

A New Superconductor Family with Various Magnetic Elements

A new superconductor family, Sc₆MTe₂, has been discovered, comprising seven variations with magnetic elements labeled as M. Notably, only a few known superconductor families exist that involve various magnetic elements.

Superconductivity

Cross-disciplinary physics and related areas of science and technology

Electron states in condensed matter

Exploring Vortex Dynamics in a Multi-band Superconductor

We measured the microwave flux-flow Hall effect in FeSe, where the cancellation of holes and electrons was observed. This is a novel effect of multi-band superconductors.

Superconductivity

Double Superconductivity in Nodal Line Material NaAlSi; Coexistence of Bulk and 2D Superconductivities

Unique diamagnetic torque signals are found in the nodal line material NaAlSi, which suggests the presence of double superconductivity; i.e., bulk superconductivity and 2D superconductivity on the crystal surface.

Superconductivity

Electronic structure and electrical properties of surfaces and nanostructures

Self-Energy Singularity Explains High-Temperature Superconductivity in Cuprates

A new review discusses the high-temperature superconductivity mechanisms in copper oxides, explaining the various phases observed in these materials based on a nonperturbative effect called self-energy singularity.

Superconductivity

Electron states 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

Fingerprint of Majorana Zero Modes through Nonlocal Measurements

The enhancement and robustness of the 2π periodic Aharonov-Bohm effect can serve as a nonlocal probe of Majorana zero modes in topological superconductors that are not restricted by fermion parity.

Superconductivity

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

Observing the de Haas–van Alphen Effect to Unveil the Electronic Structure of UTe₂ Superconductor

The topology of Fermi surfaces with heavy effective masses in strongly correlated topological superconductor UTe₂ was investigated using quantum oscillation measurements and theoretical calculations.

Electron states in condensed matter

Superconductivity

Strange Metal Behavior Potentially Associated to Hidden Electronic Nematicity

Iron-based superconductor, Ba_1-xRb_xFe₂As₂, exhibits “strange metal” behavior—linear dependence of resistivity on temperature. It seems that hidden electronic nematic fluctuations play a greater role than the well-known antiferromagnetic fluctuations.

Superconductivity

Electronic transport in condensed matter

Topology-Based Method for Determining the Order Parameter of the Putative Spin-Triplet Superconductor UTe₂

The intrinsic anomalous thermal Hall effect can be an effective probe for the order parameters of non-unitary pairing states of the putative spin-triplet superconductor UTe₂

Superconductivity

A New Route to the Realization of Topological Superconductivity

We theoretically suggest that topological Weyl superconductivity can be realized by applying a supercurrent to noncentrosymmetric line-nodal superconductors with spin–orbit coupling.

Superconductivity

Electronic structure and electrical properties of surfaces and nanostructures

Exploring Superconductivity in the Close Proximity of Polar-Nonpolar Structural Phase Transition

A polar-nonpolar structural phase transition and corresponding increase in superconducting transition temperature T_c are observed in chemically doped PtBi₂. T_c increases as the system approaches the phase boundary.

Superconductivity

New Phases of Matter: Topological Physics in the 21^st Century

Researchers from Japan highlight in an editorial our current understanding of topological phases of matter, focusing on the classification of the newly discovered symmetry protected topological phases.

Theoretical Particle Physics

Fundamental Theory of Condensed Matter Physics, Statistical Mechanics, Fluid Dynamics,

Superconductivity

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

New Classification Theory for Topological Gapless Superconducting Nodes

A new classification theory on topological superconducting gap nodes predicts two new gap structures emerging from a nonsymmorphic crystal symmetry and angular momentum.

Superconductivity

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

Semiconductor to Semimetal to Superconductor: An Excitonic Journey

A phase diagram was constructed for Ta₂NiSe₅, a promising candidate for excitonic insulators, using high pressure as a tuning parameter. The results indicated pressure-induced superconductivity in the semimetallic phase.

Superconductivity

Electronic transport in condensed matter

Exotic Superconducting States in Transition Metal Tellurides

Nb₂Pd₃Te₅ was found to show bulk superconductivity at 3.3 K. In contrast, Ta₂Pd₃Te₅, a 5d analogue of Nb₂Pd₃Te₅, showed nonmetallic electronic conduction, which was changed to show bulk superconductivity by chemical doping.

Superconductivity

Single-crystal NaAlSi Shows Unconventional Superconductivity

Interesting normal and superconducting states of NaAlSi, a topological nodal line semimetal, were revealed by the measurements using the single crystals grown by the self-flux method.

Superconductivity

Exploring the Pseudogap in Cuprate Superconductors

Electronic nematic correlation, in which electronic degree of freedom breaks the crystal symmetry, was found to have a potential link to the origin of high-temperature superconductivity in cooper oxide materials.

Superconductivity

Solving Quantum Equations with Gauge Fields: How Explicit Integrators Based on a Bipartite Lattice and Affine Transformations Can Help

We proposed an explicit numerical integrator consisting of affine transformation pairs resulting from the checkerboard lattice for spatial discretization. It can efficiently solve time evolution equations that describe dynamical quantum phenomena under gauge fields, e.g., generation, motion, interaction of quantum vortices in superconductors or superfluids.

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

Superconductivity

Review of Cutting-Edge Research on Iron Selenide Superconductors

Scientists review the incredible progress in our understanding of the superconducting properties of iron selenide and provide their own insights, taking us one step closer to revolutionizing energy and electronics.

Superconductivity

Cross-disciplinary physics and related areas of science and technology

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

Magnetic Responses of Majorana Kramers Pairs on Time-Reversal Invariant Topological Superconductors

We reveal magnetic degrees of freedom of Majorana fermions and find a new type of response that are distinct from those of conventional electrons.

Superconductivity

Electronic structure and electrical properties of surfaces and nanostructures