28 August 2022 to 2 September 2022
Science and Technology Campus, University of Parma
Europe/Rome timezone
The Open Access Conference Proceedings is Now Available!

Enhancement of strong coupling s-wave superconductivity in the vicinity of a quantum critical point in (Ca,Sr)$_3$Rh$_4$Sn$_{13}$

P-MON-43
29 Aug 2022, 17:20
1h 40m
Science and Technology Campus, University of Parma

Science and Technology Campus, University of Parma

University of Parma, Italy
Poster Superconductivity Posters

Speaker

Jonas A. Krieger (Max Planck Institute of Microstructure Physics)

Description

We report muon spin rotation ($\mu$SR) studies of the superconducting properties as a function of chemical and hydrostatic pressure on the cubic ternary intermetallic (Ca$_{x}$Sr$_{1-x}$)$_{3}$Rh$_{4}$Sn$_{13}$ compounds, which feature strong coupling phonon-mediated BCS superconductivity and a structural phase transition a critical pressure p$_c$ associated with a charge density wave (CDW) formation$\,[1]$. A strong enhancement of the superfluid density and a pronounced maximum in the pairing strength provide evidence of a quantum critial point at p$_c$, which separates a superconducting phase coexisting with CDW from a pure superconducting phase. In both phases superconductivity has a phonon-mediated BCS $s$-wave character. Together with the related isoelectronic compound Ca$_{3}$Ir$_{4}$Sn$_{13}$ $[2]$, this system shows that conventional BCS superconductors in the presence of competing orders may display behavior and characteristics of unconventional superconductors.

$[1]$ S. K. Goh, et al., Phys. Rev. Lett. 114, 097002 (2015)
$[2]$ P. K. Biswas, et al., Phys. Rev. B 92, 195122 (2015)

(a) Depolarization rate and center field as a function of temperature at ambient pressure for different chemical compositions. (b) Superconducting state parameters as a function of combined chemical and hydrostatic pressure.

Primary author

Jonas A. Krieger (Max Planck Institute of Microstructure Physics)

Co-authors

Dr Pabitra Biswas (STFC / UKRI) Dr Zurab Guguchia (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland) Dr Rustem Khasanov (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland) L. Li ( Key Laboratory of Materials Physics, Institute of Solid State Physics, CAS, CN-230031 Hefei) Kefeng Wang (Department of Physics, University of Maryland, College Park, 20742-4111, Maryland, USA) Cedomir Petrovic ( Condensed Matter Physics and Materials Science Department, Brookhaven National L, Upton, 11973 New York, USA) Ekaterina Pomjakushina (Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut) Prof. Elvezio Morenzoni (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland)

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