Enhanced magnetic quantum oscillations in the mixed state of a two-dimensional organic superconductor

Article

关键词: MAGNETOTHERMAL INSTABILITIES;    CRITICAL FIELDS;    KAPPA-(BEDT-TTF)(2)CU(NCS)(2);    YBA2CU3O7;    LIQUID;    METAL;    HEAT;   

DOI  :  10.1103/PhysRevB.67.060504

来源: SCIE

【 摘 要 】

We report on de Haas-van Alphen (dHvA) oscillations observed in the mixed state of the organic superconductor beta-(BEDT-TTF)(2)SF5CH2CF2SO3 (BEDT-TTF stands for bisethylenedithio-tetrathiafulvalene) utilizing the field-modulation technique and torque magnetometry. At low temperatures (30 mK), the dHvA signal persists down to 1.4 T well below the upper critical field B(c2)approximate to3.6 T. Contrary to most theoretical predictions and previous experimental findings, no additional damping of the dHvA-oscillation amplitude, but a reduced damping of the dHvA signal is found. This highly unusual effect might indicate a reduced quasiparticle scattering rate or an additional oscillatory contribution in the superconducting state.

【 授权许可】

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