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Phonons and superconductivity in Nd[sub 2[minus][ital x]]Ce[sub [ital x]]CuO[sub 4]

Journal Article · · Physical Review, B: Condensed Matter; (United States)
 [1];  [2]
  1. Cray Research Inc., 655E Lone Oak Drive, Eagan, Minnesota 55121 (United States)
  2. Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803 (United States)
+ Show Author Affiliations

We investigate superconducting properties of Nd[sub 2[minus][ital x]]Ce[sub [ital x]]CuO[sub 4] using conventional strong-coupling theory. The Eliashberg equations were solved based on a realistic model of the phonon density of states. The calculated properties are in good agreement with available experimental data. Specifically, we find the partial isotope exponents to be [alpha][sub Nd]=0.066, [alpha][sub Cu]=0.148, and [alpha][sub O]=0.035. The coupling parameter [lambda] is found to be 1.135 and 2[Delta][sub 0]/[ital k][sub [ital B]T[ital c]]=4.458. Our calculated quasiparticle density of states is also consistent with experiment. This study suggests that phonons in Nd[sub 2[minus][ital x]]Ce[sub [ital x]]CuO[sub 4] may have a role similar to that in conventional superconductors in which they mediate electron pairing.

OSTI ID:
6934253
Journal Information:
Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 46:21; ISSN 0163-1829; ISSN PRBMDO
Country of Publication:
United States
Language:
English

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Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMINES
AMMONIUM COMPOUNDS
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
COUPLING
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON-PHONON COUPLING
FREQUENCY DEPENDENCE
HIGH-TC SUPERCONDUCTORS
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHONONS
PHYSICAL PROPERTIES
QUASI PARTICLES
QUATERNARY COMPOUNDS
RARE EARTH COMPOUNDS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS