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Tc is insensitive to magnetic interactions in high-Tc superconductors

Authors :
Mallett, B.
Williams, G. V. M.
Kaiser, A. B.
Gilioli, E.
Licci, F.
Wolf, T.
Tallon, J. L.
Publication Year :
2012

Abstract

A quarter of a century after their discovery the mechanism that pairs carriers in the cuprate high-Tc superconductors (HTS) still remains uncertain. Despite this the general consensus is that it is probably magnetic in origin [1] so that the energy scale for the pairing boson is governed by J, the antiferromagnetic exchange interaction. Recent studies using resonant inelastic X-ray scattering strongly support these ideas [2]. Here as a further test we vary J (as measured by two-magnon Raman scattering) by more than 60% by changing ion sizes in the model HTS system LnA2Cu3O7-{\delta} where A=(Ba,Sr) and Ln=(La, Nd, Sm, Eu, Gd, Dy, Yb, Lu). Such changes are often referred to as "internal" pressure. Surprisingly, we find Tcmax anticorrelates with J where internal pressure is the implicit variable. This is the opposite to the effect of external pressure and suggests that J is not the dominant energy scale governing Tcmax.<br />Comment: 8 pages, 3 figures

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.1202.5078
Document Type :
Working Paper