Kaori Sugii

Interplanar coupling-dependent magnetoresistivity in high-purity layered metals.

The magnetic field-induced changes in the conductivity of metals are the subject of intense interest, both for revealing new phenomena and as a valuable tool for determining their Fermi surface. Here we report a hitherto unobserved magnetoresistive effect in ultra-clean layered metals, namely a negative longitudinal magnetoresistance that is capable of overcoming their very pronounced orbital one. This effect is correlated with the interlayer coupling disappearing for fields applied along the so-called Yamaji angles where the interlayer coupling vanishes. Therefore, it is intrinsically associated with the Fermi points in the field-induced quasi-one-dimensional electronic dispersion, implying that it results from the axial anomaly among these Fermi points. In its original formulation, the anomaly is predicted to violate separate number conservation laws for left- and right-handed chiral (for example, Weyl) fermions. Its observation in PdCoO2, PtCoO2 and Sr2RuO4 suggests that the anomaly affects the transport of clean conductors, in particular near the quantum limit.

Two distinct superconducting states in KFe2As2 under high pressure

We report measurements of ac magnetic susceptibility

Vortex Dynamics and Diamagnetic Torque Signals in Two Dimensional Organic Superconductor λ-(BETS)2GaCl4

chi_{ac}

Quantum-disordered state of magnetic and electric dipoles in an organic Mott system

and de Haas-van Alphen (dHvA) oscillations in KFe

In-Plane Anisotropy of Flux-Flow Resistivity in Layered Organic Superconductor λ-(BETS)2GaCl4

_2

Orbital Effect on FFLO Phase and Energy Dissipation due to Vortex Dynamics in Magnetic-Field-Induced Superconductor λ-(BETS)2FeCl4

As

Phase Boundary in a Superconducting State of κ-(BEDT-TTF)2Cu(NCS)2: Evidence of the Fulde–Ferrell–Larkin–Ovchinnikov Phase

_2

Crystal Structure and Physical Properties of π–d System κ-(BDH-TTP)2FeBr4

under high pressure up to 24.7 kbar. The pressure dependence of the superconducting transition temperature

Magnetic and Transport Properties of π–d System κ-(BDH-TTP)2FeCl4

T_c

In-Plane Anisotropy of Upper Critical Field and Flux-Flow Resistivity in Layered Organic Superconductor β′′-(ET)2SF5CH2CF2SO3

changes from negative to positive across