Point contact Andreev reflection studies of a non-centro symmetric superconductor Re6 Zr

Scientific Reports
Pradnya ParabSangita Bose

Abstract

Re6Zr, a non-centrosymmetric superconductor is an interesting system as recent experimental evidence suggests that the superconducting state breaks time reversal symmetry. This implies a mixing of spin singlet-triplet states leading to a complex order parameter in this system. Here, we report point contact Andreev Reflection (PCAR) measurements on a single crystal of Re6Zr (superconducting transition temperature (Tc) = 6.78 K). We observe multiple gap features in the PCAR spectra which depends on the type of tip and contact. Spectral features appear at voltages 1.0 ± 0.1 mV, 0.75 ± 0.05 mV and 0.45 ± 0.1 mV suggesting that there are at least more than one band contributing to superconductivity. However, strong surface inter-band scattering is possibly responsible for the uncertainty in observing them together distinctly in a single contact in the PCAR measurements. Interestingly, the bulk gap (Δ  = 1.95kBTc = 1.1 meV) is occasionally observed in PCAR spectra, mostly with ferromagnetic tips. The gap features associated with the other two smaller gaps disappear at the bulk Tc. In addition, no anisotropy in the upper critical field was observed. Our results suggest an unconventional superconducting order in this compound: Multiban...Continue Reading

References

Apr 1, 1994·Physical Review. B, Condensed Matter·A PleceníkA Pfuch
Mar 16, 2007·Physical Review Letters·M NishiyamaGuo-qing Zheng
Jun 4, 2008·Physical Review Letters·R S GonnelliS Massidda
Mar 31, 2015·Nature Communications·Zhixiang SunPeter Wahl
Jan 11, 2017·Reports on Progress in Physics·M SmidmanD F Agterberg

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Citations

Jul 30, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Sudeep GhoshHuiqiu Yuan

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Methods Mentioned

BETA
X-ray
PCAR

Software Mentioned

ASOC

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