Strong enhancement of -wave superconductivity near a quantum critical point of
- Paul Scherrer Inst. (PSI), Villigen (Switzerland)
- Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
We report microscopic studies by muon spin rotation/relaxation as a function of pressure of the and Sr3Ir4Sn13 system displaying superconductivity and a structural phase transition associated with the formation of a charge density wave (CDW). Our findings show a strong enhancement of the superfluid density and a dramatic increase of the pairing strength above a pressure of ≈ 1.6 GPa giving direct evidence of the presence of a quantum critical point separating a superconducting phase coexisting with CDW from a pure superconducting phase. The superconducting order parameter in both phases has the same s-wave symmetry. In spite of the conventional phonon-mediated BCS character of the weakly correlated (Ca1-xSrx)3Ir4Sn13 system the dependence of the effective superfluid density on the critical temperature puts this compound in the “Uemura” plot close to unconventional superconductors. This system exemplifies that conventional BCS superconductors in the presence of competing orders or multi-band structure can also display characteristics of unconventional superconductors.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC00112704
- OSTI ID:
- 1240591
- Alternate ID(s):
- OSTI ID: 1225822
- Report Number(s):
- BNL-111751-2016-JA; PRBMDO; R&D Project: PM016; KC0201050
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 19; ISSN 1098-0121
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Charge density wave quantum critical point with strong enhancement of superconductivity
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journal | July 2017 |
Study of Nb 0.18 Re 0.82 non-centrosymmetric superconductor in the normal and superconducting states
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journal | March 2019 |
Vortex phase diagram study in the superconductor Ca 3 Ir 4 Sn 13
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journal | August 2018 |
Possible quantum fluctuations in the vicinity of the quantum critical point of revealed by high-energy x-ray diffraction
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journal | March 2020 |
Study of Nb$_{0.18}$Re$_{0.82}$ non-centrosymmetric superconductor in the normal and superconducting states | text | January 2018 |
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