Site dependence of large oxygen isotope effect in Y0.7Pr0.3Ba2Cu3O6.97
Creators
- 1. Morris Research, Inc., 44 Marguerita Road, Kensington, California 94707 (United States)
- 2. Center for Advanced Materials, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)
Description
We report site-selective oxygen isotope effects on Tc and penetration depth in Y0.7Pr0.3Ba2Cu3O6.97 and in YBa2Cu3O7-δ. In Pr-substituted (underdoped) samples with 18O in only the CuO2 plane-sites, the Tc shift was -1.46 K vs -1.7 K for 18O at all sites; the αO values are 0.2 and 0.24. The corresponding Tc shifts in pure YBa2Cu3O7-δ were -0.24 K and -0.3 K. The shift is dominated by CuO2 planar oxygen mass in both compounds, and not by the apical sites. Thus, apical site isotope induced charge transfer to CuO2 planes does not seem a viable explanation for the isotope effects in YBCO. Our results indicate that the oxygen related phonons in the CuO2 planes play a significant role in the pairing mechanism. copyright 1996 The American Physical Society
Additional details
Publishing Information
- Journal Title
- Physical Review. B, Condensed Matter
- Journal Volume
- 54
- Journal Issue
- 21
- Journal Page Range
- p. 14982-14985.
- ISSN
- 0163-1829
- CODEN
- PRBMDO
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 28012324
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- BARIUM OXIDES; COPPER OXIDES; CRYSTAL DOPING; HIGH-TC SUPERCONDUCTORS; ISOTOPE EFFECTS; PENETRATION DEPTH; PRASEODYMIUM; TRANSITION TEMPERATURE; YTTRIUM OXIDES
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; ELEMENTS; METALS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; RARE EARTHS; SUPERCONDUCTORS; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS; YTTRIUM COMPOUNDS