Pressure dependence of the superconducting critical temperature of Tl{sub 2}Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10+{ital y}} and Tl{sub 2}Ba{sub 2}Ca{sub 3}Cu{sub 4}O{sub 12+{ital y}} up to 21 GPa

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.54.10175· OSTI ID:385710

Jover, D T; Wijngaarden, R J; Griessen, R ^[1]; Haines, E M; Tallon, J L ^[2]; Liu, R S ^[3]

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1. Department of Physics and Astronomy, Free University, De Boelelaan 1081, 1081 HV Amsterdam (The Netherlands)
2. Institute for Industrial Research & Development, Gracefield Research Centre, Gracefield Road, P.O. Box 31310, Lower Hutt (New Zealand)
3. Department of Chemistry, National Taiwan University, Roosevelt Road, Section 4, Taipei, Taiwan, Republic of (China)

Using a cryogenic diamond anvil cell (DAC) the pressure dependence of the superconducting transition temperature {ital T}{sub {ital c}} of Tl{sub 2}Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10+{ital y}} (Tl-2223) and Tl{sub 2}Ba{sub 2}Ca{sub 3}Cu{sub 4}O{sub 12+{ital y}} (Tl-2234) has been measured resistively up to 21 GPa. At ambient pressure these compounds have {ital T}{sub {ital c}}{close_quote}s of 128.5 K and 113 K. At low pressures, the pressure dependence {partial_derivative}{ital T}{sub {ital c}}/{partial_derivative}{ital p} is 1.75 K/GPa in Tl-2223 and 2.0 K/GPa in Tl-2234. As pressure is increased {ital T}{sub {ital c}} continues to increase (although the rate diminishes) until {ital T}{sub {ital c}} reaches a maximum of 133 K at 4.2 GPa in Tl-2223 and of 120 K at 6.6 GPa in Tl-2234. At higher pressures {ital T}{sub {ital c}} decreases. In this region a rather abrupt change in {partial_derivative}{ital T}{sub {ital c}}/{partial_derivative}{ital p} is observed at {ital p}{sub {ital c}}=12.0 GPa in Tl-2223 and at {ital p}{sub {ital c}}=10.5 GPa in Tl-2234. The kink at {ital p}{sub {ital c}} is interpreted as an indication of the presence of {ital inequivalent} CuO{sub 2} layers: Below {ital p}{sub {ital c}} the {ital T}{sub {ital c}} of the samples is determined by the intrinsic {ital T}{sub {ital c}} of the outer CuO{sub 2} layers while above {ital p}{sub {ital c}} it is determined by that of the inner CuO{sub 2} layers. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 385710
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 14 Vol. 54; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
CALCIUM OXIDES
CHARGE DISTRIBUTION
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRON TRANSFER
HIGH-TC SUPERCONDUCTORS
PRESSURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
THALLIUM OXIDES
TRANSITION TEMPERATURE
VERY HIGH PRESSURE