Effect of A-site and B-site substitution on the infrared reflectivity spectra of La1-yAyMn1-xBxO3 (A=Ba,Sr;: B=Cu,Zn,Sc;: 0<y≤0.3;: 0≤x≤0.1) manganites -: art. no. 064302

被引：20
作者：
De Marzi, G
Popovic, ZV
Cantarero, A
Dohcevic-Mitrovic, Z
Paunovic, N
Bok, J
Sapiña, F
机构：
[1] Univ Valencia, Inst Sci Mat, Valencia 46071, Spain
[2] Inst Phys, YU-11080 Belgrade, Serbia, Serbia
[3] CNRS, UPR 5, ESPCI, Solid State Phys Lab, F-75005 Paris, France
来源：
PHYSICAL REVIEW B | 2003年 / 68卷 / 06期
关键词：
D O I：
10.1103/PhysRevB.68.064302
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have measured the infrared reflectivity spectra of La1-y[Sr(Ba)](y)Mn1-x[Cu(Zn,Sc)](x)O-3 (0<yless than or equal to0.3, 0less than or equal toxless than or equal to0.10) manganites, in a wide frequency (100-4000 cm(-1)) and temperature (80 K-300 K) range. The reflectivity spectra were analyzed by a fitting procedure based on a model that includes Drude, midinfrared electronic, and phonon oscillator contributions to the dielectric constant. Six infrared active (3A(u) and 3E(u)) modes of rhombohedral symmetry are clearly observed. We assigned all observed modes according to existing lattice dynamical calculations for the rhombohedral structure of LaMnO3. A decrease of the rhombohedral distortion below the paramagnetic-ferromagnetic transition is manifested through a lowering or complete removal of the frequency difference between the A(u) and E-u modes.
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相关论文
共 24 条
[1]   Comparative study of optical phonons in the rhombohedrally distorted perovskites LaAlO3 and LaMnO3 [J].
Abrashev, MV ;
Litvinchuk, AP ;
Iliev, MN ;
Meng, RL ;
Popov, VN ;
Ivanov, VG ;
Chakalov, RA ;
Thomsen, C .
PHYSICAL REVIEW B, 1999, 59 (06) :4146-4153
[2]   Structural and chemical analysis of colossal magnetoresistance manganites by Raman spectrometry -: art. no. 104430 [J].
Amelitchev, VA ;
Güttler, B ;
Gorbenko, OY ;
Kaul, AR ;
Bosak, AA ;
Ganin, AY .
PHYSICAL REVIEW B, 2001, 63 (10) :1044301-1044307
[3]   Electronic properties of mixed-valence manganates:: The role of Mn substitutional defects [J].
El-Fadli, Z ;
Metni, MR ;
Sapiña, F ;
Martinez, E ;
Folgado, JV ;
Beltrán, A .
CHEMISTRY OF MATERIALS, 2002, 14 (02) :688-696
[4]  
Fontcuberta J, 1999, PHYS WORLD, V12, P33
[5]   Colossal magnetoresistance of ferromagnetic manganites: Structural tuning and mechanisms [J].
Fontcuberta, J ;
Martinez, B ;
Seffar, A ;
Pinol, S ;
GarciaMunoz, JL ;
Obradors, X .
PHYSICAL REVIEW LETTERS, 1996, 76 (07) :1122-1125
[6]   Phonon Raman scattering in R1-xAxMnO3+δ (R = La,Pr; A = Ca,Sr) [J].
Granado, E ;
Moreno, NO ;
Garcia, A ;
Sanjurjo, JA ;
Rettori, C ;
Torriani, I ;
Oseroff, SB ;
Neumeier, JJ ;
McClellan, KJ ;
Cheong, SW ;
Tokura, Y .
PHYSICAL REVIEW B, 1998, 58 (17) :11435-11440
[7]   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
[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]   Pressure effects on the magnetoresistance in doped manganese perovskites [J].
Hwang, HY ;
Palstra, TTM ;
Cheong, SW ;
Batlogg, B .
PHYSICAL REVIEW B, 1995, 52 (21) :15046-15049
[10]   Effective Hamiltonian in manganites: Study of the orbital and spin structures [J].
Ishihara, S ;
Inoue, J ;
Maekawa, S .
PHYSICAL REVIEW B, 1997, 55 (13) :8280-8286
123