Isotope effects in multiband superconductors

2006/06/09 by N. Kristoffel, Kristoffel, N., P. Rubin +1
Chemistry · Physics and Astronomy · #Inorganic Fluorides and Related Compounds #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #cond-mat.supr-con

paper · pdf · doi:10.48550/arxiv.cond-mat/0606230

11 pages, 4 figures

arxiv created 2006/06/09 · arxiv updated 2009/12/01

Abstract

Isotope effects in a multiband superconductor with a leading interband pairing channel are investigated. A relatively small electron-phonon contribution into the pair-transfer interaction can cause effects of observed magnitude. A multiband model which interpolates the cuprate properties is used for illustrative calculations. Isotope exponents of the transition temperature (α), supercarrier density (α_n), paired carrier effective mass (α_m) and of the penetration depth (α_λ) on the doping scale have been obtained. The known opposite trend of α and T_c is reflected. The trends of α and α_n are similar. In contrast with the usual assumption in the interband case α_λ is driven by α_n, which overwhelmes α_m.

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