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Title: Strong enhancement of s -wave superconductivity near a quantum critical point of Ca 3 Ir 4 Sn 13

Abstract

We report microscopic studies by muon spin rotation/relaxation as a function of pressure of the Ca 3 Ir 4 Sn 13 and Sr 3Ir 4Sn 13 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 (Ca 1-xSr x) 3Ir 4Sn 13 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.

Authors:
 [1];  [1];  [1];  [1];  [2];  [2];  [2];  [1]
  1. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1240591
Alternate Identifier(s):
OSTI ID: 1225822
Report Number(s):
BNL-111751-2016-JA
Journal ID: ISSN 1098-0121; PRBMDO; R&D Project: PM016; KC0201050
Grant/Contract Number:  
SC00112704
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 19; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Biswas, P. K., Guguchia, Z., Khasanov, R., Chinotti, M., Li, L., Wang, Kefeng, Petrovic, C., and Morenzoni, E. Strong enhancement of s -wave superconductivity near a quantum critical point of Ca3Ir4Sn13. United States: N. p., 2015. Web. doi:10.1103/PhysRevB.92.195122.
Biswas, P. K., Guguchia, Z., Khasanov, R., Chinotti, M., Li, L., Wang, Kefeng, Petrovic, C., & Morenzoni, E. Strong enhancement of s -wave superconductivity near a quantum critical point of Ca3Ir4Sn13. United States. doi:10.1103/PhysRevB.92.195122.
Biswas, P. K., Guguchia, Z., Khasanov, R., Chinotti, M., Li, L., Wang, Kefeng, Petrovic, C., and Morenzoni, E. Wed . "Strong enhancement of s -wave superconductivity near a quantum critical point of Ca3Ir4Sn13". United States. doi:10.1103/PhysRevB.92.195122. https://www.osti.gov/servlets/purl/1240591.
@article{osti_1240591,
title = {Strong enhancement of s -wave superconductivity near a quantum critical point of Ca3Ir4Sn13},
author = {Biswas, P. K. and Guguchia, Z. and Khasanov, R. and Chinotti, M. and Li, L. and Wang, Kefeng and Petrovic, C. and Morenzoni, E.},
abstractNote = {We report microscopic studies by muon spin rotation/relaxation as a function of pressure of the Ca3Ir4Sn13 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.},
doi = {10.1103/PhysRevB.92.195122},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 19,
volume = 92,
place = {United States},
year = {2015},
month = {11}
}

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Cited by: 12 works
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    Works referencing / citing this record:

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