Dimensional crossover in the electrical and magnetic properties of the layered LaSb2 superconductor under pressure: The role of phase fluctuations

Article

关键词: UNDERDOPED BI2SR2CACU2O8+DELTA;    COMPOUND 2H-TAS2;    CRITICAL FIELDS;    NORMAL-STATE;    TRANSITION;    PSEUDOGAP;    NBSE2;    FILMS;    GAP;   

DOI  :  10.1103/PhysRevB.83.174520

来源: SCIE

【 摘 要 】

We present electrical transport, magnetization, and ac as well as dc magnetic susceptibility measurements of the highly anisotropic compound LaSb2. Our data display a very broad anisotropic transition upon cooling below 2.5 K into a clean superconducting state with a field-dependent magnetization that is consistent with type I behavior. We identify distinct features of two-dimensionality in both the transport and magnetic properties. Application of hydrostatic pressure induces a two- to three-dimensional crossover evidenced by a reduced anisotropy and transition width. The superconducting transition appears phase-fluctuation-limited at ambient pressure, with fluctuations observed for temperatures greater than eight times the superconducting critical temperature.

【 授权许可】

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