Non-magnetic impurity and defect doping in superconductors Li 2Pd3B with noncentrosymmetric crystal structures

G. Bao, Yoshihiko Inada, S. Harada, Guo-Qing Zheng

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Abstract

The spin singlet and spin triplet superconducting states can coexist in noncentrosymmetric crystal structures like Li2T3B (T: Pd, Pt), while it is prohibited in ordinary crystal structures. In this study, we focused our research on non-magnetic impurity effect in Li2T3B(T: Pd, Pt). The nature of the pair breaking by non-magnetic impurity in the parity mixing superconducting state is still unclear. We investigated the effect of non-magnetic impurity on s-wave dominant parity mixing superconductor Li2Pd3B by substituting B with Al. In this substitution process, we controlled the quality of the samples and showed their quality deteriorations through the measurement of residual resistivity at Tc. Furthermore, we checked the relations of residual resistivity and Tc as well as its superconducting phase diagram. Our results showed that s-wave dominant parity mixing superconductor Li2Pd3B exhibits the small Tc suppression attributed by the non-magnetic impurities and defects, while the Hc2 value clearly increased about 1.5 times in the poor quality samples. Such behaviours are similarly observed in ordinary s-wave superconductors.

Original languageEnglish
Article number012084
JournalJournal of Physics: Conference Series
Volume391
Issue number1
DOIs
Publication statusPublished - 2012

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impurities
parity
crystal structure
defects
electrical resistivity
deterioration
phase diagrams
retarding
substitutes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

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title = "Non-magnetic impurity and defect doping in superconductors Li 2Pd3B with noncentrosymmetric crystal structures",
abstract = "The spin singlet and spin triplet superconducting states can coexist in noncentrosymmetric crystal structures like Li2T3B (T: Pd, Pt), while it is prohibited in ordinary crystal structures. In this study, we focused our research on non-magnetic impurity effect in Li2T3B(T: Pd, Pt). The nature of the pair breaking by non-magnetic impurity in the parity mixing superconducting state is still unclear. We investigated the effect of non-magnetic impurity on s-wave dominant parity mixing superconductor Li2Pd3B by substituting B with Al. In this substitution process, we controlled the quality of the samples and showed their quality deteriorations through the measurement of residual resistivity at Tc. Furthermore, we checked the relations of residual resistivity and Tc as well as its superconducting phase diagram. Our results showed that s-wave dominant parity mixing superconductor Li2Pd3B exhibits the small Tc suppression attributed by the non-magnetic impurities and defects, while the Hc2 value clearly increased about 1.5 times in the poor quality samples. Such behaviours are similarly observed in ordinary s-wave superconductors.",
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T1 - Non-magnetic impurity and defect doping in superconductors Li 2Pd3B with noncentrosymmetric crystal structures

AU - Bao, G.

AU - Inada, Yoshihiko

AU - Harada, S.

AU - Zheng, Guo-Qing

PY - 2012

Y1 - 2012

N2 - The spin singlet and spin triplet superconducting states can coexist in noncentrosymmetric crystal structures like Li2T3B (T: Pd, Pt), while it is prohibited in ordinary crystal structures. In this study, we focused our research on non-magnetic impurity effect in Li2T3B(T: Pd, Pt). The nature of the pair breaking by non-magnetic impurity in the parity mixing superconducting state is still unclear. We investigated the effect of non-magnetic impurity on s-wave dominant parity mixing superconductor Li2Pd3B by substituting B with Al. In this substitution process, we controlled the quality of the samples and showed their quality deteriorations through the measurement of residual resistivity at Tc. Furthermore, we checked the relations of residual resistivity and Tc as well as its superconducting phase diagram. Our results showed that s-wave dominant parity mixing superconductor Li2Pd3B exhibits the small Tc suppression attributed by the non-magnetic impurities and defects, while the Hc2 value clearly increased about 1.5 times in the poor quality samples. Such behaviours are similarly observed in ordinary s-wave superconductors.

AB - The spin singlet and spin triplet superconducting states can coexist in noncentrosymmetric crystal structures like Li2T3B (T: Pd, Pt), while it is prohibited in ordinary crystal structures. In this study, we focused our research on non-magnetic impurity effect in Li2T3B(T: Pd, Pt). The nature of the pair breaking by non-magnetic impurity in the parity mixing superconducting state is still unclear. We investigated the effect of non-magnetic impurity on s-wave dominant parity mixing superconductor Li2Pd3B by substituting B with Al. In this substitution process, we controlled the quality of the samples and showed their quality deteriorations through the measurement of residual resistivity at Tc. Furthermore, we checked the relations of residual resistivity and Tc as well as its superconducting phase diagram. Our results showed that s-wave dominant parity mixing superconductor Li2Pd3B exhibits the small Tc suppression attributed by the non-magnetic impurities and defects, while the Hc2 value clearly increased about 1.5 times in the poor quality samples. Such behaviours are similarly observed in ordinary s-wave superconductors.

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