Anomalous isotope effect in BCS superconductors with two boson modes

The isotope effect in the superconducting transition temperature is anomalous if the isotope coefficient α < 0 or α > 1/2. In this work, we show that such anomalous behaviors can naturally arise within the Bardeen–Cooper–Schrieffer framework if both phonon and non-phonon modes coexist. Differe...

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Veröffentlicht in:	New journal of physics 2021-05, Vol.23 (5), p.53006
Hauptverfasser:	Sun, Gan, Lou, Pan-Xiao, Lai, Sheng-Qiang, Wang, Da, Wang, Qiang-Hua
Format:	Artikel
Sprache:	eng
Schlagworte:	BCS theory Coefficients Isotope effect Phonons Physics superconductivity Superconductors Transition temperature Unconventional superconductivity
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description	The isotope effect in the superconducting transition temperature is anomalous if the isotope coefficient α < 0 or α > 1/2. In this work, we show that such anomalous behaviors can naturally arise within the Bardeen–Cooper–Schrieffer framework if both phonon and non-phonon modes coexist. Different from the case of the standard Eliashberg theory (with only phonon) in which α ⩽ 1/2, the isotope coefficient can now take arbitrary values in the simultaneous presence of phonon and the other non-phonon mode. In particular, most strikingly, a pair-breaking phonon can give rise to large isotope coefficient α > 1/2 if the unconventional superconductivity is mediated by the lower frequency non-phonon boson mode. Based on our studies, implications on several families of superconductors are discussed.
doi_str_mv	10.1088/1367-2630/abfb8a
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subjects	BCS theory Coefficients Isotope effect Phonons Physics superconductivity Superconductors Transition temperature Unconventional superconductivity
title	Anomalous isotope effect in BCS superconductors with two boson modes
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