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Unconventional Bulk Superconductivity in YFe2Ge2 Single Crystals

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Banda,  Jacintha
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Brando,  Manuel
Manuel Brando, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Chen, J., Gamża, M. B., Banda, J., Murphy, K., Tarrant, J., Brando, M., et al. (2020). Unconventional Bulk Superconductivity in YFe2Ge2 Single Crystals. Physical Review Letters, 125(23): 237002, pp. 1-6. doi:10.1103/PhysRevLett.125.237002.


Cite as: http://hdl.handle.net/21.11116/0000-0007-9D01-7
Abstract
Sharp superconducting transition anomalies observed in a new generation of single crystals establish that bulk superconductivity is intrinsic to high purity YFe2Ge2. Low temperature heat capacity measurements suggest a disorder and field dependent residual Sommerfeld coefficient, consistent with disorder-induced in-gap states as expected for a sign-changing order parameter. The sevenfold reduction in disorder scattering in these new crystals to residual resistivities similar or equal to 0.45 mu Omega cm was achieved using a new liquid transport growth technique, paving the way for multiprobe experiments investigating the normal and superconducting states of YFe2Ge2.