Effective spinless fermions in the strong-coupling Kondo model -: art. no. 144425

被引：13

作者：

Koller, W ^{[1
]}

Prüll, A ^{[1
]}

Evertz, HG ^{[1
]}

von der Linden, W ^{[1
]}

机构：

[1] Graz Univ Technol, Inst Theoret Phys, A-8010 Graz, Austria

来源：

PHYSICAL REVIEW B | 2002年 / 66卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.66.144425

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Starting from the two-orbital Kondo-lattice model with classical t(2g) spins, an effective spinless fermion model is derived for strong Hund coupling J(H) with a projection technique. The model is studied by Monte Carlo simulations and analytically using a uniform hopping approximation. The results for the spinless fermion model are in remarkable agreement with those of the original Kondo-lattice model, independent of the carrier concentration, and even for moderate Hund coupling J(H). Phase separation, the phase diagram in uniform hopping approximation, as well as spectral properties including the formation of a pseudogap are discussed for both the Kondo-lattice and the effective spinless fermion model in one and three dimensions.

引用

页码：1 / 10

页数：10

共 20 条

[1]

Auerbach A., 1994, INTERACTING ELECT QU

[2] Quasiparticles and the structure of orbital polarons in ferromagnetic LaMnO3 -: art. no. 134420 [J].

Bala, J ;

Oles, AM ;

Horsch, P .

PHYSICAL REVIEW B, 2002, 65 (13) :1-15

[3] Ferromagnetic Kondo model for manganites: Phase diagram, charge segregation, and influence of quantum localized spins [J].

Dagotto, E ;

Yunoki, S ;

Malvezzi, AL ;

Moreo, A ;

Hu, J ;

Capponi, S ;

Poilblanc, D ;

Furukawa, N .

PHYSICAL REVIEW B, 1998, 58 (10) :6414-6427

[4] Colossal magnetoresistant materials: The key role of phase separation [J].

Dagotto, E ;

Hotta, T ;

Moreo, A .

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 2001, 344 (1-3) :1-153

[5] κ-dependent electronic structure, a large "ghost" Fermi surface, and a pseudogap in a layered magnetoresistive oxide [J].

Dessau, DS ;

Saitoh, T ;

Park, CH ;

Shen, ZX ;

Villella, P ;

Hamada, N ;

Moritomo, Y ;

Tokura, Y .

PHYSICAL REVIEW LETTERS, 1998, 81 (01) :192-195

[6]

FURUKAWA N, 1998, PHYSICS MANGANITES

[7] Double-exchange magnets: Spin dynamics in the paramagnetic phase [J].

Horsch, P ;

Jaklic, J ;

Mack, F .

PHYSICAL REVIEW B, 1999, 59 (22) :14149-14152

[8] Charge-orbital ordering and phase separation in the two-orbital model for manganites: Roles of Jahn-Teller phononic and Coulombic interactions [J].

Hotta, T ;

Malvezzi, AL ;

Dagotto, E .

PHYSICAL REVIEW B, 2000, 62 (14) :9432-9452

[9]

KAPLAN TA, 1998, PHYSICS MANGANITES

[10]

KOLLER W, UNPUB

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