Anomalous sign change in hall coefficient of κ-(BEDT-TTF)2Cu[N(CN)2]Br under pressure

Pressure-Induced Mott Transition in an Organic Superconductor with a Finite Doping Level

“…Note that the drastic change in R H occurs in a metallic state, which is reported to be stable [16,18,19]. Above 0.6 GPa, both magnitude and pressure dependences of R H are similar to those of the half-filled metallic system κ-(ET) 2 Cu[N(CN) 2 ]Br [24], the R H values of which well correspond to the cross-sectional area of Fermi surfaces as in other κ-ET compounds in a conventional metallic state [24,32]. Therefore, κ-HgBr under pressures above 0.6 GPa is considered to be in a conventional metallic state with a large Fermi surface as in κ-(ET) 2 Cu[N(CN) 2 ]Br.…”

“…[24] The normal and SC states under pressure are characterized by contactless conductivity measurements, which utilize the technique of AC susceptibility measurements in the MHz frequency range. This method probes the resistivity in the normal state because the eddy current due to electromagnetic induction causes a diamagnetic response, which yields the characteristic length of flux penetration, namely the skin depth, δ (the so-called skin effect).…”

Theory of Thermal Conductivity in High-Tc Superconductors below Tc: Comparison between Hole-Doped and Electron-Doped Systems

“…On the other hand, the charge CVC gives anomalous transport properties for R H [2], S [3], magnetoresistance [24] and Nernst coefficient [25] both in hole-doped and electron-doped systems. Anomalous transport phenomena due to charge CVC are also observed in CeMIn 5 (M=Co,Rh) [27] and in κ-(BEDT-TTF) 2 X [28].…”