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2014 ; 111
(51
): 18178-82
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Emergence of superconductivity in heavy-electron materials
#MMPMID25489102
Yang YF
; Pines D
Proc Natl Acad Sci U S A
2014[Dec]; 111
(51
): 18178-82
PMID25489102
show ga
Although the pairing glue for the attractive quasiparticle interaction
responsible for unconventional superconductivity in heavy-electron materials has
been identified as the spin fluctuations that arise from their proximity to a
magnetic quantum critical point, there has been no model to describe their
superconducting transition at temperature Tc that is comparable to that found by
Bardeen, Cooper, and Schrieffer (BCS) for conventional superconductors, where
phonons provide the pairing glue. Here we propose such a model: a
phenomenological BCS-like expression for Tc in heavy-electron materials that is
based on a simple model for the effective range and strength of the
spin-fluctuation-induced quasiparticle interaction and reflects the unusual
properties of the heavy-electron normal state from which superconductivity
emerges. We show that it provides a quantitative understanding of the
pressure-induced variation of Tc in the "hydrogen atoms" of unconventional
superconductivity, CeCoIn5 and CeRhIn5, predicts scaling behavior and a dome-like
structure for Tc in all heavy-electron quantum critical superconductors, provides
unexpected connections between members of this family, and quantifies their
variations in Tc with a single parameter.
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