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

Journal Article · Tue Dec 01 00:00:00 EST 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.46.14321· OSTI ID:6934253

Chen, H ^[1]; Callaway, J ^[2]

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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)

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), Vol. 46:21; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

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