Pressure dependence of the superconducting critical temperature of HgBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 8+{ital y}} and HgBa{sub 2}Ca{sub 3}Cu{sub 4}O{sub 10+{ital y}} up to 30 GPa
- Department of Physics and Astronomy, Free University, De Boelelaan 1081, 1081 HV Amsterdam (The Netherlands)
- Laboratoire de Crystallographie, CNRS, Boite Postale 166, 38042 Grenoble (France)
- Laboratorium fuer Festkoerperphysik, Eidgenoessische Technische Hochschule Hoenggerberg, 8093 Zuerich (Switzerland)
By performing experiments on samples as pure as presently available, the origin of the reported pressure-induced {ital T}{sub {ital c}} values well above 150 K in the mercury-based high-{ital T}{sub {ital c}} superconductors has been investigated. For HgBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 8+{ital y}} (Hg-1223) maximum {ital T}{sub {ital c}} values between 142 K and 146 K are obtained under pressure up to 30 GPa, while for HgBa{sub 2}Ca{sub 3}Cu{sub 4}O{sub 10+{ital y}} (Hg-1234) {ital T}{sub {ital c}} never exceeds 121 K. To verify the reproducibility between different laboratories the pressure dependence of a sample from the same batch as the sample on which Nu{tilde n}ez-Regueiro reported a {ital T}{sub {ital c}} value of 157 K at 23.5 GPa has also been measured. Below 10 GPa the agreement with his results is rather good and a possible explanation for the disagreement above 10 GPa is given. It appears that the reported high {ital T}{sub {ital c}} values in non-single-phase Hg-1223 samples are due to the presence of Hg-1234 phase impurities. Also some of the adopted definitions of {ital T}{sub {ital c}} have led to somewhat optimistic values of {ital T}{sub {ital c}}: The high-pressure results on Hg-1223 found in the literature are therefore reviewed and reanalyzed. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 286697
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 6 Vol. 54; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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