Spin-orbital physics in the optical conductivity of quarter-filled manganites

被引：13

作者：

Bala, J

Horsch, P

机构：

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

[2] Jagiellonian Univ, Marian Smoluchowski Inst Phys, PL-30059 Krakow, Poland

来源：

PHYSICAL REVIEW B | 2005年 / 72卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.72.012404

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using finite-temperature diagonalization we investigate the optical conductivity sigma(omega) and spin-orbital dynamics in the CE phase of half-doped manganites. We find sigma(omega) characterized by a broad spectrum with pronounced optical gap due to charge ordering induced by Coulomb and further-neighbor Jahn-Teller interactions. With increasing temperature the conductivity shows a significant change over a wide energy range with a characteristic shift towards lower frequencies. In the low-temperature CE phase we observe in-gap absorption due to combined orbiton-spin excitations.

引用

收藏

页数：4

相关论文

共 26 条

[1] Temperature dependence of optical spectral weights in quarter-filled ladder systems [J].

Aichhorn, M ;

Horsch, P ;

von der Linden, W ;

Cuoco, M .

PHYSICAL REVIEW B, 2002, 65 (20) :1-4

[2] Manganites at quarter filling: Role of Jahn-Teller interactions [J].

Bala, J ;

Horsch, P ;

Mack, F .

PHYSICAL REVIEW B, 2004, 69 (09)

[3] Excitations in the anisotropic spin-orbital model [J].

Bala, J ;

Oles, AM ;

Sawatzky, GA .

PHYSICAL REVIEW B, 2001, 63 (13)

[4] Strain selection of charge and orbital ordering patterns in half-doped manganites -: art. no. 100401 [J].

Calderón, MJ ;

Millis, AJ ;

Ahn, KH .

PHYSICAL REVIEW B, 2003, 68 (10)

[5]

CUCOCO M, 2002, PHYS REV B, V66, P4437

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

Feiner, LF ;

Oles, AM .

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

[7] Anisotropic CE-type orbital correlations in the ferromagnetic metallic phase of Nd1/2Sr1/2MnO3 -: art. no. 184407 [J].

Geck, J ;

Bruns, D ;

Hess, C ;

Klingeler, R ;

Reutler, P ;

von Zimmermann, M ;

Cheong, SW ;

Büchner, B .

PHYSICAL REVIEW B, 2002, 66 (18) :1-8

[8] THEORY OF THE ROLE OF COVALENCE IN THE PEROVSKITE-TYPE MANGANITES [LA,M(II)]MNO3 [J].

GOODENOUGH, JB .

PHYSICAL REVIEW, 1955, 100 (02) :564-573

[9] Optical conductivity of colossal-magnetoresistance compounds: Role of orbital degeneracy in the ferromagnetic phase [J].

Horsch, P ;

Jaklic, J ;

Mack, F .

PHYSICAL REVIEW B, 1999, 59 (09) :6217-6228

[10] Optical response to orbital and charge ordering in a layered manganite:: La1/2Sr3/2MnO4 [J].

Ishikawa, T ;

Ookura, K ;

Tokura, Y .

PHYSICAL REVIEW B, 1999, 59 (13) :8367-8370