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25 April 2024

» arxiv » 1207.0915

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Long-range incommensurate charge fluctuations in (Y,Nd)Ba2Cu3O(6+x)
G. Ghiringhelli ; M. Le Tacon ; M. Minola ; S. Blanco-Canosa ; C. Mazzoli ; N.B. Brookes ; G.M. De Luca ; A. Frano ; D. G. Hawthorn ; F. He ; T. Loew ; M. Moretti Sala ; D.C. Peets ; M. Salluzzo ; E. Schierle ; R. Sutarto ; G. A. Sawatzky ; E. Weschke ; B. Keimer ; L. Braicovich ;
Date:	4 Jul 2012
Abstract:	There are increasing indications that superconductivity competes with other orders in cuprate superconductors, but obtaining direct evidence with bulk-sensitive probes is challenging. We have used resonant soft x-ray scattering to identify two-dimensional charge fluctuations with an incommensurate periodicity of $f sim 3.2$ lattice units in the copper-oxide planes of the superconductors (Y,Nd)Ba$_2$Cu$_3$O$_{6+x}$ with hole concentrations $0.09 leq p leq 0.13$ per planar Cu ion. The intensity and correlation length of the fluctuation signal increase strongly upon cooling down to the superconducting transition temperature, $T_c$; further cooling below $T_c$ abruptly reverses the divergence of the charge correlations. In combination with prior observations of a large gap in the spin excitation spectrum, these data indicate an incipient charge-density-wave instability that competes with superconductivity.
Source:	arXiv, 1207.0915
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