Author:
Krieger J A,Guguchia Z,Khasanov R,Biswas P K,Li L,Wang K,Petrovic C,Morenzoni E
Abstract
Abstract
We report microscopic studies by muon spin spectroscopy of the superconducting properties as a function of chemical and hydrostatic pressure in the cubic ternary intermetallic (Ca
x
Sr1−x
)3Rh4Sn13 compounds. We find evidence of a quantum critical point at a critical pressure p
c
in the superconducting phase, where the superfluid density increases by a factor of two and the superconducting pairing strength displays a pronounced maximum. The enhancement of superconductivity is related to the structural phase transition at p
c
, which is accompanied by profound changes of the Fermi surface associated to the suppression of a charge density wave (CDW). The quantum critical point separates a superconducting phase coexisting with CDW from a pure superconducting phase, while in both phases superconductivity has a strong-coupling phonon-mediated BCS-like s-wave character. Together with the related isoelectronic compound (Ca
x
Sr1−x
)3Ir4Sn13, this system shows that conventional BCS superconductors in the presence of competing orders may display behaviour and characteristics of unconventional superconductors.
Subject
Computer Science Applications,History,Education
Cited by
1 articles.
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