Uniaxial pressure dependence of T{sub c} in (Y{sub 1-y}Ca{sub y}){sub 1}Ba{sub 2}Cu{sub 3}O{sub x} single crystals via high-resolution thermal expansion

Journal Article · Sun Dec 01 04:00:00 EST 1996 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1007/BF00753894· OSTI ID:443675

Meingast, C ^[1]; Wolf, T ^[2]; Klaester, M; Mueller-Vogt, G ^[3]

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1. Institut fuer Nukleare Festkoerperphysik, Karlsruhe (Germany)
2. Institut fuer Technische Physik, Karlsruhe (Germany)
3. Universitaet Karlsruhe (Germany)

The uniaxial pressure dependence of T{sub c}, dT{sub c}/dp{sub i} (i = a-b, c), of twinned (Y{sub 0.89}Ca{sub 0.11}){sub 1}Ba{sub 2}Cu{sub 3}O{sub x} single crystals has been investigated as a function of O doping, with special emphasis given to the over-doped regime. The dT{sub c}/dp{sub i} values are not measured directly, but are determined from high-resolution thermal expansion data (obtained with a capacitance dilatometer) using the thermodynamic Ehrenfest relationship. Both dT{sub c}/dp{sub c} and dT{sub c}/dp{sub a,b} become negative in the over-doped region. The effect is larger along the c-axis. The c-axis results can be described by a simple pressure-induced charge-transfer model, whereas the a, b-axis results are more complicated.

• Sponsoring Organization: USDOE
• OSTI ID: 443675
• Report Number(s): CONF-960808--
• Journal Information: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 5-6 Vol. 105; ISSN JLTPAC; ISSN 0022-2291
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
CALCIUM OXIDES
COPPER OXIDES
HIGH-TC SUPERCONDUCTORS
OXYGEN
PRESSURE DEPENDENCE
STOICHIOMETRY
TRANSITION TEMPERATURE
YTTRIUM OXIDES