Resistive properties and phase diagram of the organic antiferromagnetic metal kappa-(BETS)(2)FeCl4

Article

关键词: FIELD-INDUCED SUPERCONDUCTIVITY;    HIGH MAGNETIC-FIELDS;    FERMI-SURFACE;    SPIN-FLOP;    BIS(ETHYLENEDITHIO)TETRASELENAFULVALENE;    CONDUCTORS;    BETS;    MAGNETOTRANSPORT;    TRANSITIONS;    ANIONS;   

DOI  :  10.1103/PhysRevB.94.205104

来源: SCIE

【 摘 要 】

The low-temperature electronic state of the layered organic charge-transfer salt kappa-(BETS)(2)FeCl4 was probed by interlayer electrical resistance measurements under magnetic field. Both above and below T-N = 0.47 K, the temperature of antiferromagnetic ordering of 3d-electron spins of Fe3+ localized in the insulating anion layers, a nonsaturating linear R(T) dependence has been observed. A weak superconducting signal has been detected in the antiferromagnetic state, at temperatures <= 0.2 K. Despite the very high crystal quality, only a tiny fraction of the sample appears to be superconducting. Aside from a small kink feature in the resistivity, the impact of the antiferromagnetic ordering of localized Fe3+ spins on the conduction p-electron system is clearly manifested in the Fermi surface reconstruction, as evidenced by Shubnikov-de Haas oscillations. The magnetic-field-temperature phase diagrams for the field directions parallel to each of the three principal crystal axes have been determined. For magnetic field along the easy axis, a spin-flop transition has been found. Similarities and differences between the present material and the sister compound kappa-(BETS)(2)FeBr4 are discussed.

【 授权许可】

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