Pressure dependence of T{sub c} in strongly underdoped YBa{sub 2}Cu{sub 3}O{sub 6.41} as a function of pressure - temperature history.
The dependence of the superconducting transition temperature T{sub c}(P) of strongly underdoped YBa{sub 2}Cu{sub 3}O{sub 6.41} [T{sub c}(1 bar)14 K] on hydrostatic pressure is determined to 7 GPa in an ac susceptibility measurement in a diamond-anvil-cell loaded with dense helium as pressure medium. T{sub c}(P) is found to depend markedly on the temperature-pressure history due to the importance of relaxation processes in the oxygen sublattice. The relaxation time {tau} increases exponentially with pressure, corresponding to an activation volume of +4.2 cm{sup 3}/mol. The 'intrinsic' T{sub c}(P)-dependence (that devoid of relaxation effects) is determined whereby T{sub c} initially increases with pressure, passes through a maximum near 17 K at 2 GPa, and falls below 1.6 K above 7 GPa.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC; NSF
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 942736
- Report Number(s):
- ANL/MSD/JA-34110
- Journal Information:
- Physica C, Journal Name: Physica C Journal Issue: 1-2 ; May 1, 1999 Vol. 316; ISSN 0921-4534; ISSN PHYCE6
- Country of Publication:
- United States
- Language:
- ENGLISH
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