Anisotropic superconductivity in layered LaSb$_2$: the role of phase fluctuations

Physics – Condensed Matter – Superconductivity

Scientific paper

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4 pages with 4 figures and 2 pages of sup. materials which includes 2 figures

Scientific paper

We present magnetic susceptibility and electrical transport measurements of the highly anisotropic compound LaSb$_2$ observing a very broad transition into a clean, consistent with type-I, superconducting state with distinct features of 2 dimensionality. Application of hydrostatic pressure induces a 2- to 3-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 8 times the superconducting critical temperature.

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