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Title: Electronic structure and properties of quasi-two-dimensional layered superconducting perovskites: La/sub 2-//sub x/M/sub x/CuO/sub 4/ (M = Ba, Sr,. )

Abstract

Results of highly precise all-electron local-density calculations are presented for the quasi-two-dimensional superconductors, La/sub 2-//sub x/M/sub x/CuO/sub 4/(M = Ba, Sr, . . . ) with x = 0 and correlated with a number of observed properties of these materials for varying x. The dominant role of the van Hove saddle-point singularity (SPS) on the density of states (DOS) and the DOS-derived properties (specific heat, magnetic susceptibility, T/sub c/) is emphasized--as is the fact that this SPS represents the classic Lifshitz transition versus x (and/or pressure) with its possible thermodynamic and galvanomagnetic anomalies. Estimates of the enhancement factor lambda from a variety of measured specific-heat values and our calculated DOS indicate that these materials may possibly be weak-coupling superconductors. Crude estimates of coherent lengths (xi/sub X/ and xi/sub perpendicular/) and upper critical fields (H/sub c//sub 2//sub X/ and H/sub c//sub 2//sub perpendicular/) are presented.

Authors:
; ;
Publication Date:
Research Org.:
Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60201
OSTI Identifier:
5799986
Resource Type:
Journal Article
Journal Name:
Phys. Rev. B: Condens. Matter; (United States)
Additional Journal Information:
Journal Volume: 36:13
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BARIUM OXIDES; ELECTRONIC STRUCTURE; COPPER OXIDES; LANTHANUM OXIDES; STRONTIUM OXIDES; COHERENCE LENGTH; CRITICAL FIELD; ENERGY-LEVEL DENSITY; SPECIFIC HEAT; SUPERCONDUCTORS; ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; DIMENSIONS; LANTHANUM COMPOUNDS; LENGTH; MAGNETIC FIELDS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; STRONTIUM COMPOUNDS; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS; 360204* - Ceramics, Cermets, & Refractories- Physical Properties; 656100 - Condensed Matter Physics- Superconductivity

Citation Formats

Freeman, A.J., Yu, J., and Fu, C.L. Electronic structure and properties of quasi-two-dimensional layered superconducting perovskites: La/sub 2-//sub x/M/sub x/CuO/sub 4/ (M = Ba, Sr,. ). United States: N. p., 1987. Web. doi:10.1103/PhysRevB.36.7111.
Freeman, A.J., Yu, J., & Fu, C.L. Electronic structure and properties of quasi-two-dimensional layered superconducting perovskites: La/sub 2-//sub x/M/sub x/CuO/sub 4/ (M = Ba, Sr,. ). United States. doi:10.1103/PhysRevB.36.7111.
Freeman, A.J., Yu, J., and Fu, C.L. Sun . "Electronic structure and properties of quasi-two-dimensional layered superconducting perovskites: La/sub 2-//sub x/M/sub x/CuO/sub 4/ (M = Ba, Sr,. )". United States. doi:10.1103/PhysRevB.36.7111.
@article{osti_5799986,
title = {Electronic structure and properties of quasi-two-dimensional layered superconducting perovskites: La/sub 2-//sub x/M/sub x/CuO/sub 4/ (M = Ba, Sr,. )},
author = {Freeman, A.J. and Yu, J. and Fu, C.L.},
abstractNote = {Results of highly precise all-electron local-density calculations are presented for the quasi-two-dimensional superconductors, La/sub 2-//sub x/M/sub x/CuO/sub 4/(M = Ba, Sr, . . . ) with x = 0 and correlated with a number of observed properties of these materials for varying x. The dominant role of the van Hove saddle-point singularity (SPS) on the density of states (DOS) and the DOS-derived properties (specific heat, magnetic susceptibility, T/sub c/) is emphasized--as is the fact that this SPS represents the classic Lifshitz transition versus x (and/or pressure) with its possible thermodynamic and galvanomagnetic anomalies. Estimates of the enhancement factor lambda from a variety of measured specific-heat values and our calculated DOS indicate that these materials may possibly be weak-coupling superconductors. Crude estimates of coherent lengths (xi/sub X/ and xi/sub perpendicular/) and upper critical fields (H/sub c//sub 2//sub X/ and H/sub c//sub 2//sub perpendicular/) are presented.},
doi = {10.1103/PhysRevB.36.7111},
journal = {Phys. Rev. B: Condens. Matter; (United States)},
number = ,
volume = 36:13,
place = {United States},
year = {1987},
month = {11}
}