Existence of orbital polarons in ferromagnetic insulating La1-xSrMnO3 (0.11≤x≤0.14) revealed by giant phonon softening -: art. no. 174402

被引：30

作者：

Choi, KY

Lemmens, P

Sahaoui, T

Güntherodt, G

Pashkevich, YG

Gnezdilov, VP

Reutler, P

Pinsard-Gaudart, L

Büchner, B

Revcolevschi, A

机构：

[1] Tohoku Univ, Mat Res Inst, Sendai, Miyagi 9808577, Japan

[2] Rhein Westfal TH Aachen, Inst Phys 2, D-52056 Aachen, Germany

[3] Max Planck Inst Solid State Phys, D-70569 Stuttgart, Germany

[4] Tech Univ Braunschweig, Inst Condensed Matter Phys, D-38106 Braunschweig, Germany

[5] AA Galkin Donetsk Phystech NASU, UA-83114 Donetsk, Ukraine

[6] BI Verkin Inst Low Temp Phys NASU, UA-61164 Kharkov, Ukraine

[7] Univ Paris 11, Lab Physicochim, F-91405 Orsay, France

[8] IFW Dresden, Inst Solid State Res, D-01171 Dresden, Germany

来源：

PHYSICAL REVIEW B | 2005年 / 71卷 / 17期

关键词：

D O I：

10.1103/PhysRevB.71.174402

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present an inelastic light scattering study of single crystalline (La1-yPry)(1-x)SrxMnO3 (0 <= x <= 0.14, y = 0 and x = 1/8, 0 <= y <= 0.5). A giant softening up to 20-30 cm(-1) of the Mn-O breathing mode has been observed only for the ferromagnetic insulating (FMI) samples (0.11 <= x <= 0.14) upon cooling below the Curie temperature (T-C). With increasing Pr-doping the giant softening is strongly suppressed. This is attributed to a coupling of the breathing mode to orbital polarons, which are present in the FMI state. Moreover, the softening that persists to lowest temperature without saturation suggests a continuous, temperature-dependent evolution of orbital polarons below T-C.

引用

页数：7

共 28 条

[1] Orbital-lattice polarons in ferromagnetic LaMnO3 -: art. no. 184414 [J].

Bala, J ;

Oles, AM ;

Sawatzky, GA .

PHYSICAL REVIEW B, 2002, 65 (18) :1844141-18441410

[2]

BALTENSPERGER W, 1968, HELV PHYS ACTA, V41, P668

[3] Lattice and charge excitations in La1-xSrxMnO3 [J].

Björnsson, P ;

Rübhausen, M ;

Bäckström, J ;

Käll, M ;

Eriksson, S ;

Eriksen, J ;

Börjesson, L .

PHYSICAL REVIEW B, 2000, 61 (02) :1193-1197

[4]

COX DE, 2001, PHYS REV B, V64

[5] Structure-properties phase diagram for La1-xSrxMnO3 (0.1≤x≤0.2) [J].

Dabrowski, B ;

Xiong, X ;

Bukowski, Z ;

Dybzinski, R ;

Klamut, PW ;

Siewenie, JE ;

Chmaissem, O ;

Shaffer, J ;

Kimball, CW ;

Jorgensen, JD ;

Short, S .

PHYSICAL REVIEW B, 1999, 60 (10) :7006-7017

[6] Transition between two ferromagnetic states driven by orbital ordering in La0.88Sr0.12MnO3 [J].

Endoh, Y ;

Hirota, K ;

Ishihara, S ;

Okamoto, S ;

Murakami, Y ;

Nishizawa, A ;

Fukuda, T ;

Kimura, H ;

Nojiri, H ;

Kaneko, K ;

Maekawa, S .

PHYSICAL REVIEW LETTERS, 1999, 82 (21) :4328-4331

[7] Rearrangement of the orbital-ordered state at the metal-insulator transition of La7/8Sr1/8MnO3 -: art. no. 104413 [J].

Geck, J ;

Wochner, P ;

Bruns, D ;

Büchner, B ;

Gebhardt, U ;

Kiele, S ;

Reutler, P ;

Revcolevschi, A .

PHYSICAL REVIEW B, 2004, 69 (10)

[8] Orbital order induced ferromagnetic insulating properties -: art. no. 152 [J].

Geck, J ;

Wochner, P ;

Kiele, S ;

Klingeler, R ;

Revcolevschi, A ;

Von Zimmermann, M ;

Büchner, B ;

Reutler, P .

NEW JOURNAL OF PHYSICS, 2004, 6 :1-27

[9] Magnetic ordering effects in the Raman spectra of La1-xMn1-xO3 [J].

Granado, E ;

García, A ;

Sanjurjo, JA ;

Rettori, C ;

Torriani, I ;

Prado, F ;

Sánchez, RD ;

Caneiro, A ;

Oseroff, SB .

PHYSICAL REVIEW B, 1999, 60 (17) :11879-11882

[10] OPTIC PHONON ANOMALIES AND F-D HYBRIDIZATION IN SMS AND SMB6 [J].

GUNTHERODT, G ;

MERLIN, R ;

FREY, A ;

CARDONA, M .

SOLID STATE COMMUNICATIONS, 1978, 27 (05) :551-556

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