Temperature effects in a spin-orbital model for manganites

被引：9

作者：

Daghofer, M

Neuber, DR

Oles, AM

von der Linden, W

机构：

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

[2] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[3] Jagiellonian Univ, M Smoluchowski Inst Phys, PL-30059 Krakow, Poland

来源：

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2006年 / 243卷 / 01期

关键词：

D O I：

10.1002/pssb.200562464

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 [凝聚态物理];

摘要：

We study a two-dimensional effective orbital superexchange model derived for strongly correlated e,, electrons coupled to t(2g) core spins in layered manganites. One finds that the ferromagnetic (FM) and antiferromagnetic (AF) correlations closely compete, and small changes of parameters can switch the type of magnetic order. For the same reason, spin order is easily destroyed with rising temperature, while alternating orbital correlations can persist to temperatures where FM order has already melted. A scenario for the AF phase observed in LaSrMnO4 is presented. (c) 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

引用

收藏

页码：277 / 280

页数：4

相关论文

共 9 条

[1]

Orbital polarons versus itinerant eg electrons in doped manganites -: art. no. 184430 [J].

Daghofer, M ;

Oles, AM ;

von der Linden, W .

PHYSICAL REVIEW B, 2004, 70 (18) :1-17

[2]

Onset of metallic ferromagnetism in a doped spin-orbital chain [J].

Daghofer, M ;

Oles, AM ;

von der Linden, W .

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, 2005, 242 (02) :311-316

[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]

Electronic origin of magnetic and orbital ordering in insulating LaMnO3 [J].

Feiner, LF ;

Oles, AM .

PHYSICAL REVIEW B, 1999, 59 (05) :3295-3298

[6]

Uniform hopping approach to the ferromagnetic Kondo model at finite temperature -: art. no. 104432 [J].

Koller, W ;

Prüll, A ;

Evertz, HG ;

von der Linden, W .

PHYSICAL REVIEW B, 2003, 67 (10) :10

[7]

Why spin excitations in metallic ferromagnetic manganites are isotropic [J].

Oles, AM ;

Feiner, LF .

PHYSICAL REVIEW B, 2002, 65 (05) :1-4

[8]

Crystal and magnetic structure of La1-xSr1+xMnO4:: Role of the orbital degree of freedom -: art. no. 024425 [J].

Senff, D ;

Reutler, P ;

Braden, M ;

Friedt, O ;

Bruns, D ;

Cousson, A ;

Bourée, F ;

Merz, M ;

Büchner, B ;

Revcolevschi, A .

PHYSICAL REVIEW B, 2005, 71 (02)

[9]

Phase separation in electronic models for manganites [J].

Yunoki, S ;

Hu, J ;

Malvezzi, AL ;

Moreo, A ;

Furukawa, N ;

Dagotto, E .

PHYSICAL REVIEW LETTERS, 1998, 80 (04) :845-848