Morgan James Grant, Yi Liu, Guanghan Cao, Joseph Alec Wilcox, Yanfeng Guo, Xiaofeng Xu, Antony Carrington
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引用次数: 0
Abstract
Experimental determination of the structure of the superconducting order parameter in the kagome lattice compound CsV3Sb5is an essential step towards understanding the nature of the superconducting pairing in this material. Here we report measurements of the temperature dependence of the in-plane magnetic penetration depth, λ(T), in crystals of CsV3Sb5down to ∼ 60 mK. We find that λ(T) is consistent with a fully-gapped state but with significant gap anisotropy. The magnitude of the gap minima obtained are 0.16kBTcand 0.21kBTcfor the measured samples, markedly smaller than previous estimates. We discuss different forms of potential anisotropy and how these can be linked to the V and Sb Fermi surface sheets. We highlight a significant discrepancy between the calculated and measured values of λ(T=0) which we suggest is caused by spatially suppressed superconductivity.
期刊介绍:
Journal of Physics: Condensed Matter covers the whole of condensed matter physics including soft condensed matter and nanostructures. Papers may report experimental, theoretical and simulation studies. Note that papers must contain fundamental condensed matter science: papers reporting methods of materials preparation or properties of materials without novel condensed matter content will not be accepted.