Anomalous dissipation in the mixed state of underdoped cuprates close to the superconductor-insulator boundary

Article

关键词: HIGH-TEMPERATURE SUPERCONDUCTOR;    T-C SUPERCONDUCTORS;    VALENCE-BOND THEORY;    THIN-FILMS;    MAGNETIC-FIELD;    PHASE-DIAGRAM;    VORTEX CORES;    LA2-XSRXCUO4;    TRANSITION;    NERNST;   

DOI  :  10.1103/PhysRevB.67.100507

来源: SCIE

【 摘 要 】

We present a comparative study of Nernst effect and resistivity in underdoped samples of Bi2Sr2CuO6+delta and La2-xSrxCuO4. The Nernst effect presents a peak in a region of the H-T diagram where resistivity shows a nonmetallic temperature dependence. Our results illustrate that the mechanism of dissipation in the mixed state of underdoped cuprates is poorly understood. Large quantum superconducting fluctuations and vanishing vortex viscosity are among suggested explanations for an enhanced Nernst signal close to the superconductor-insulator boundary.

【 授权许可】

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