Effect of band filling in the Kondo lattice: A mean-field approach

被引：23

作者：

Ruppenthal, AR ^{[1
]}

Iglesias, JR ^{[1
]}

Gusmao, MA ^{[1
]}

机构：

[1] Univ Fed Rio Grande do Sul, Inst Fis, BR-91501970 Porto Alegre, RS, Brazil

来源：

PHYSICAL REVIEW B | 1999年 / 60卷 / 10期

关键词：

D O I：

10.1103/PhysRevB.60.7321

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The usual Kondo lattice, including an antiferromagnetic exchange interaction between nearest-neighboring localized spins, is treated here in a mean-field scheme that introduces two mean-field parameters: one associated with the local Kondo effect, and the other related to the magnetic correlations between localized spins. Phases with short-range magnetic correlations or coexistence between those and the Kondo effect are obtained. By varying the number of electrons in the conduction band, we notice that the Kondo effect tends to be suppressed away from half filling, while magnetic correlations can survive if the Heisenberg coupling is strong enough. An enhanced linear coefficient of the specific heat is obtained at low temperatures in the metallic state. [S0163-1829(99)00534-2].

引用

页码：7321 / 7327

页数：7

共 21 条

[1]

ALIEV FG, 1982, JETP LETT+, V35, P539

[2] STRONG LOCAL ELECTRON CORRELATIONS IN HIGH-TEMPERATURE SUPERCONDUCTORS - MEAN-FIELD DESCRIPTION OF THE METAL-INSULATOR-TRANSITION [J].

BRINCKMANN, J ;

GREWE, N .

ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER, 1991, 84 (02) :179-192

[3] KONDO-STABILIZED SPIN LIQUIDS AND HEAVY FERMION SUPERCONDUCTIVITY [J].

COLEMAN, P ;

ANDREI, N .

JOURNAL OF PHYSICS-CONDENSED MATTER, 1989, 1 (26) :4057-4080

[4] METAL-INSULATOR-TRANSITION IN SEMI-METALS AND KONDO INSULATORS [J].

CONTINENTINO, MA .

PHYSICS LETTERS A, 1995, 197 (5-6) :417-422

[5]

COQBLIN B, 1995, J PHYS SOC JPN, V65, P64

[6] THEORY OF PHOTOEMISSION AND INVERSE PHOTOEMISSION IN THE PRESENCE OF STRONG CORRELATIONS - APPLICATION TO HIGH-TC MATERIALS [J].

DEMELO, CARS ;

DONIACH, S .

PHYSICAL REVIEW B, 1990, 41 (10) :6633-6640

[7]

HEWSON AC, 1992, KONDO PROBLEM HEAVY

[8] Revisited Doniach diagram: Influence of short-range antiferromagnetic correlations in the Kondo lattice [J].

Iglesias, JR ;

Lacroix, C ;

Coqblin, B .

PHYSICAL REVIEW B, 1997, 56 (18) :11820-11826

[9] NEW FUNCTIONAL INTEGRAL APPROACH TO STRONGLY CORRELATED FERMI SYSTEMS - THE GUTZWILLER APPROXIMATION AS A SADDLE-POINT [J].

KOTLIAR, G ;

RUCKENSTEIN, AE .

PHYSICAL REVIEW LETTERS, 1986, 57 (11) :1362-1365

[10] KONDO EFFECT IN REAL METALS [J].

NOZIERES, P ;

BLANDIN, A .

JOURNAL DE PHYSIQUE, 1980, 41 (03) :193-211

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