Phonon-drag thermopower correlations to {ital T}{sub {ital c}} in superconducting Sr{sub {ital x}}Nd{sub 1{minus}{ital x}}CuO{sub 2{minus}{delta}}: Evidence for phonon-mediated pairing in the high-{ital T}{sub {ital c}} parent compounds
- Oak Ridge National Laboratory, P.O. Box 2009, Oak Ridge, Tennessee 37831-8040 (United States)
The {ital A}CuO{sub 2} compounds---containing only CuO{sub 2} planes separated by {ital A} ions---are the basic ``building blocks`` of the more complex high-{ital T}{sub {ital c}} superconductors. Trivalently doped Sr{sub {ital x}}Nd{sub 1{minus}{ital x}}CuO{sub 2{minus}{delta}} thin films are shown to superconduct with the appearance of a phonon-drag contribution to the thermopower at the superconducting doping threshold. A monotonic increase in this phonon-drag contribution with {ital T}{sub {ital c}} suggests that electron-phonon interactions play an important role in the pairing mechanism. A correlation between the deduced BCS coupling constants and {ital T}{sub {ital c}} is consistent with strong-coupling theory.
- Research Organization:
- Oak Ridge National Laboratory
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 76439
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 2 Vol. 52; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CALCIUM ADDITIONS
CRYSTAL DOPING
CUPRATES
ELECTRON-PHONON COUPLING
NEODYMIUM ADDITIONS
SOLID SOLUTIONS
SOLUBILITY
STRONTIUM OXIDES
SUBSTOICHIOMETRY
SUPERCONDUCTING FILMS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
THERMOELECTRIC PROPERTIES
TRANSITION TEMPERATURE