Electronic band structure of the superconductor Sr[sub 2]RuO[sub 4]

Journal Article · Sat Dec 31 23:00:00 EST 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.51.1385· OSTI ID:7060911

Oguchi, T ^[1]

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1. Department of Materials Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 724 (Japan)

A local-density electronic-band-structure calculation was performed for a recently discovered non-copper-layered perovskite superconductor, Sr[sub 2]RuO[sub 4]. It was found that the electronic structure near the Fermi energy is essentially described by antibonding bands of the Ru [ital d][var epsilon] and O [ital p][pi] states. Although two holes in the bands are predominantly situated in a [ital d][var epsilon]([ital xy])-[ital p][pi] state in the [ital ab] plane, the hole occupations in the other [ital d][var epsilon]-[ital p][pi] states vertical to the plane are not negligibly small, possibly in conjunction with the smallness of tetragonal distortion of the RuO[sub 6] octahedron. Associated with the antibonding [ital d][var epsilon]-[ital p][pi] bands, the density of states at the Fermi energy is relatively high (4.36 states/eVcell) but not enough to account for the observed specific-heat constant [gamma][sub exp] and temperature-independent magnetic susceptibility [chi][sub exp]. We found a large Stoner factor, which may explain most of the mass enhancement involved in [chi][sub exp]. Certain similarities and dissimilarities in the electronic properties to the cuprate superconductors are discussed.

• OSTI ID: 7060911
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 51:2; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
ELECTRONIC STRUCTURE
ENERGY-LEVEL DENSITY
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
RUTHENIUM COMPOUNDS
RUTHENIUM OXIDES
SPECIFIC HEAT
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS