Pressure-induced charge transfer and dTc/dP in YBa2Cu3O7-x

J. D. Jorgensen*, Shiyou Pei, P. Lightfoot, D. G. Hinks, B. W. Veal, B. Dabrowski, A. P. Paulikas, R. Kleb, I. D. Brown

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

243 Citations (Scopus)

Abstract

Subtle pressure-induced structural changes in YBa2Cu3O6.93 and YBa2Cu3O6.60 have been measured by neutron powder diffraction for samples in a hydrostatic helium-gas pressure cell. Small, but significant, differences in the compression of particular Cu-O bonds (notably Cu(2)-O(4)) are observed. However, when the charges on the two copper sites are calculated, requiring overall charge conservation versus pressure, it is found that the net pressure-induced charge transfer of holes from Cu(1) to Cu(2) is essentially the same for both systems. We conclude that the much smaller value of dTc/dP for YBa2Cu3O6.93 results from the fact that, in the 90 K superconductor, the Tc has already reached its optimum value and the introduction of additional hole carriers cannot further increase Tc.

Original languageEnglish
Pages (from-to)93-102
Number of pages10
JournalPhysica C: Superconductivity and its applications
Volume171
Issue number1-2
DOIs
Publication statusPublished - 15 Oct 1990

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