Tuesday, June 11, 2013

1306.2277 (Z. Lotfi Mahyari et al.)

Universal inhomogeneous magnetic-field response in the normal state of
cuprate high-Tc superconductors

Z. Lotfi Mahyari, A. Cannell, E. V. L. de Mello, M. Ishikado, H. Eisaki, Ruixing Liang, D. A. Bonn, W. N. Hardy, J. E. Sonier
We report the results of a muon spin rotation (muSR) study of the bulk of Bi{2+x}Sr{2-x}CaCu2O{8+\delta}, as well as pure and Ca-doped YBa2Cu3Oy, which together with prior measurements reveal a universal inhomogeneous magnetic-field response of hole-doped cuprates extending to temperatures far above the critical temperature (Tc). The primary features of our data are incompatible with the spatially inhomogeneous response being directly related to the normal-state pseudogap, or known charge density wave (CDW) and spin density wave (SDW) orders. Instead the normal-state inhomogeneous line broadening is found to scale with the maximum value Tc^max for each cuprate family, indicating it is controlled by the same energy scale as Tc. Since the degree of chemical disorder varies widely among the cuprates we have measured, the observed scaling constitutes evidence for an intrinsic electronic tendency toward inhomogeneity above Tc.
View original: http://arxiv.org/abs/1306.2277

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