Hydrostatic and uniaxial pressure effect on T{sub c} of YBa{sub 2}Cu{sub 3}O{sub x}
- Institut fuer Technische Physik, Karlsruhe (Germany); and others
The variation of the transition temperature T{sub c} of YBa{sub 2}Cu{sub 3}O{sub x} with hydrostatic He-gas pressure depends on the oxygen content x. The pressure effect dT{sub c}/dp increases from small negative values at x=7 to dT{sub c}/dp=7.4 K/GPa at x=6.7. For oxygen contents below x=6.7 dT{sub c}/dp drops to 3 K/GPa and remains nearly constant. The charge transfer model cannot explain the drop at x=6.7. Thermal expansion measurements on YBa{sub 2}Cu{sub 3}O{sub x} indicated that the uniaxial pressure effects along the three crystal axes are different. To investigate the uniaxial pressure effects inductively an experimental setup was constructed. The T{sub c}-change of several YBa{sub 2}Cu{sub 3}O{sub x} single crystals with different oxygen contents has been investigated under pressure along the c-axis. To avoid oxygen ordering processes the samples were held below 105 K during the measurements. The results of uniaxial pressure measurements in c-axis direction fit to former uniaxial pressure data and are explained within the charge transfer model. Hydrostatic pressure data of overdoped samples fit to the same curve. However, this is not the case for under doped samples. From this the authors conclude that only a part of the hydrostatic pressure effect can be explained by charge transfer in the underdoped region. The remaining part can be ascribed to uniaxial pressure effects along the a- and b-axis.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 443674
- 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 0022-2291; ISSN JLTPAC
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effect of uniaxial stress on the superconducting transition in YBa sub 2 Cu sub 3 O sub 7
Dependence of the critical temperature on atomic structure in orthorhombic YBa{sub 2}Cu{sub 3}O{sub {ital x}}