Theory of antiferromagnetic superconductors

Journal Article · Mon Sep 01 04:00:00 EDT 1980 · Phys. Rev., B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.22.2307· OSTI ID:5069564

Machida, K; Nokura, K; Matsubara, T

In this paper a theory is presented of antiferromagnetic superconductors in which a spin-density wave (SDW) ordering with a wave vector Q may coexist with superconductivity. The effect of the antiferromagnetic molecular field h/sub Q/(T) on the Cooper pairing is studied, and it is shown that, below the magnetic transition temperature T/sub N/' the Bardeen-Cooper-Schruffer coupling parameter is reduced by a factor of (1-constsuch thatub Q/(T)epsilon/sub F/) due to the formation of energy gaps of SDW on the Fermi surface along Q and this reduction can explain the anomaly in the upper critical field H/sub c/2 just below T/sub N/ as observed in RMo/sub 6/S/sub 8/ (R=Gd, Tb, and Dy). Taking account of both the spin-orbit scattering and spin-fluctuation effect near T/sub N/ in addition to the effect of h/sub Q/(T), a theoretical calculation of the superconducting transition temperature T/sub c/ and H/sub c/2(T) is performed. Detailed quantitative comparisons between theory and experiments on H/sub c/2(T) are made with fairly good accord for the above three compounds. Some speculation is given to discuss the remaining descrepancies between theory and experiments and certain phenomena not yet explained by the theory.

• Research Organization: Department of Physics, Kyoto University, Kyoto, Japan
• OSTI ID: 5069564
• Journal Information: Phys. Rev., B: Condens. Matter; (United States), Journal Name: Phys. Rev., B: Condens. Matter; (United States) Vol. 22:5; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
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Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETISM
CHALCOGENIDES
COOPER PAIRS
CRITICAL FIELD
DYSPROSIUM
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
ENERGY GAP
ENERGY LEVELS
FERMI LEVEL
GADOLINIUM COMPOUNDS
GADOLINIUM SULFIDES
MAGNETIC FIELDS
MAGNETISM
METALS
MOLYBDENUM COMPOUNDS
MOLYBDENUM SULFIDES
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
RARE EARTHS
SPIN WAVES
SULFIDES
SULFUR COMPOUNDS
SUPERCONDUCTIVITY
TERBIUM COMPOUNDS
TERBIUM SULFIDES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE