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Absence of gross static inhomogeneity in cuprate superconductors

J. W. Loram, J. L. Tallon, W. Y. Liang
2004 Physical Review B  

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2002 pre-print arXiv:cond-mat/0212461v1 fatcat:6ntfglyaerbw5flnq4ihf44i3y
Recent scanning tunnelling microscopy (STM) studies on Bi_2Sr_2CaCu_2O_8+δ (Bi-2212) revealed the presence of severe inhomogeneity with length scale L_0 ≈ξ_0, the coherence length. Other studies have been interpreted in terms of mesoscale or nanoscale phase segregation. Here we analyze heat capacity and NMR data on Bi-2212 and (Y,Ca)Ba_2Cu_3O_7-δ and find no evidence for phase segregation or gross inhomogeneity. For Bi-2212 the coherence scale L_0 increases with doping from 5 to 17ξ_0 and the
more » ... le density inhomogeneity decreases from 0.028 to 0.005 holes/Cu. We conclude that STM measurements considerably overstate the inhomogeneity in bulk Bi-2212.
doi:10.1103/physrevb.69.060502 fatcat:7at6vo3adbegdegeqmtbh5eia4
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J. W. Loram, J. L. Tallon, W. Y. Liang. "Absence of gross static inhomogeneity in cuprate superconductors." Physical Review B 69.6 (2004)