The electron-positron momentum density and Fermi surface of YBa{sub 2}Cu{sub 3}O{sub 7-x}
- Texas Univ., Arlington, TX (United States)
- California Univ., Davis, CA (United States)
- Lawrence Livermore National Lab., CA (United States)
The search for evidence of Fermi surface in the cuprate high temperature superconductors has provided the greatest challenge for the 2D ACAR technique thus far in its relatively short history. Much of the effort in both theory and experiment has focused on the Yttrium compound where the small size of samples, twinning and structural oxygen defects have made the experiments difficult, complicated the interpretation of results and led to some confusion. With the advent of good twin-free crystals that confusion has now been resolved. In this paper we shall briefly review the earlier experiments on twinned crystals and then describe in more detail, and in the context of the contemporary bandstructure theory, our recent clear resolution of a major Fermi surface section in untwinned crystals of YBa{sub 2}Cu{sub 3}O{sub 7-x}.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); Welch (Robert A.) Foundation, Houston, TX (United States); Texas Advanced Research Program, TX (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 10126918
- Report Number(s):
- UCRL-JC-108674; CONF-9108150-9; ON: DE92008605; CNN: Grant 003656-133; Grant Y-1135
- Resource Relation:
- Conference: 9. international conference on positron annihilation,Szombathely (Hungary),26-31 Aug 1991; Other Information: PBD: 11 Oct 1991
- Country of Publication:
- United States
- Language:
- English
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SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
HIGH-TC SUPERCONDUCTORS
FERMI LEVEL
YTTRIUM COMPOUNDS
BARIUM COMPOUNDS
COPPER OXIDES
BAND THEORY
ANGULAR CORRELATION
ANNIHILATION
MEASURING METHODS
CRYSTALS
665411
360204
360207
BASIC SUPERCONDUCTIVITY STUDIES
PHYSICAL PROPERTIES