Raman and optical spectroscopic studies of small-to-large polaron crossover in the perovskite manganese oxides

被引:189
作者
Yoon, S
Liu, HL
Schollerer, G
Cooper, SL
Han, PD
Payne, DA
Cheong, SW
Fisk, Z
机构
[1] Univ Illinois, Dept Phys, Urbana, IL 61801 USA
[2] Univ Illinois, Frederick Seitz Mat Res Lab, Urbana, IL 61801 USA
[3] Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA
[4] AT&T Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA
[5] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA
[6] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32306 USA
关键词
D O I
10.1103/PhysRevB.58.2795
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We present an optical reflectance and Raman-scattering study of the A(1-x)A' xMnO3 system as a function of temperature and doping (0.2 less than or equal to x less than or equal to 0.5). The metal-semiconductor transition in the A(1-x)A' xMnO3 system is characterized by a change from a diffusive electronic Raman-scattering response in the high-temperature paramagnetic phase, to a flat continuum scattering response in the low-temperature ferromagnetic phase. We interpret this change in the scattering response as a crossover from a small-polaron-dominated regime at high temperatures to a large-polaron-dominated low-temperature regime. Interestingly, we observe evidence for the coexistence of large and small polarons in the low-temperature ferromagnetic phase. We contrast these results with those obtained for EuB6, which is a low-T-c magnetic semiconductor with similar properties to the manganites, but with a substantially reduced carrier density and polaron energy.
引用
收藏
页码:2795 / 2801
页数:7
相关论文
共 33 条
[1]   CONSIDERATIONS ON DOUBLE EXCHANGE [J].
ANDERSON, PW ;
HASEGAWA, H .
PHYSICAL REVIEW, 1955, 100 (02) :675-681
[2]   OPTICAL STUDY OF ELECTRONIC-STRUCTURE IN PEROVSKITE-TYPE RMO(3) (R=LA, Y M=SC, TI, V, CR, MN, FE, CO, NI, CU) [J].
ARIMA, TH ;
TOKURA, Y .
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1995, 64 (07) :2488-2501
[3]   Direct observation of lattice polaron formation in the local structure of La1-xCaxMnO3 [J].
Billinge, SJL ;
DiFrancesco, RG ;
Kwei, GH ;
Neumeier, JJ ;
Thompson, JD .
PHYSICAL REVIEW LETTERS, 1996, 77 (04) :715-718
[4]   EFFECTS OF DOUBLE EXCHANGE IN MAGNETIC CRYSTALS [J].
DEGENNES, PG .
PHYSICAL REVIEW, 1960, 118 (01) :141-154
[5]   PHONON-ASSISTED TRANSITION RATES .1. OPTICAL-PHONON-ASSISTED HOPPING IN SOLIDS [J].
EMIN, D .
ADVANCES IN PHYSICS, 1975, 24 (03) :305-348
[6]   Electronic Raman scattering from La0.7Sr0.3MnO3 exhibiting giant magnetoresistance [J].
Gupta, R ;
Sood, AK ;
Mahesh, R ;
Rao, CNR .
PHYSICAL REVIEW B, 1996, 54 (21) :14899-14902
[7]   EFFECT OF AN APPLIED MAGNETIC-FIELD ON THE ABRUPT DONOR COLLAPSE IN A FERROMAGNETIC SEMICONDUCTOR [J].
HILLERY, MS ;
EMIN, D ;
LIU, NLH .
PHYSICAL REVIEW B, 1988, 38 (14) :9771-9777
[8]   LATTICE EFFECTS ON THE MAGNETORESISTANCE IN DOPED LAMNO3 [J].
HWANG, HY ;
CHEONG, SW ;
RADAELLI, PG ;
MAREZIO, M ;
BATLOGG, B .
PHYSICAL REVIEW LETTERS, 1995, 75 (05) :914-917
[9]   Raman spectroscopy of orthorhombic perovskitelike YMnO3 and LaMnO3 [J].
Iliev, MN ;
Abrashev, MV ;
Lee, HG ;
Popov, VN ;
Sun, YY ;
Thomsen, C ;
Meng, RL ;
Chu, CW .
PHYSICAL REVIEW B, 1998, 57 (05) :2872-2877
[10]   High-temperature thermopower in La2/3Ca1/3MnO3 films: Evidence for polaronic transport [J].
Jaime, M ;
Salamon, MB ;
Rubinstein, M ;
Treece, RE ;
Horwitz, JS ;
Chrisey, DB .
PHYSICAL REVIEW B, 1996, 54 (17) :11914-11917