Colossal effects in transition metal oxides caused by intrinsic inhomogeneities

被引:380
作者
Burgy, J [1 ]
Mayr, M
Martin-Mayor, V
Moreo, A
Dagotto, E
机构
[1] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32306 USA
[2] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy
关键词
D O I
10.1103/PhysRevLett.87.277202
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The influence of quenched disorder on the competition between ordered states separated by a first-order transition is investigated. A phase diagram with features resembling quantum-critical behavior is observed, even using classical, models. The low-temperature paramagnetic regime consists of coexisting, ordered clusters, with randomly oriented order parameters. Extended to manganites, this state is argued to have a colossal magnetoresistance effect. A scale T* for cluster formation is discussed. This is the analog of the Griffiths temperature, but for the case of two competing orders, producing a strong susceptibility to external fields. Cuprates may have similar features, compatible with the large proximity effect of the very underdoped regime.
引用
收藏
页码:277202 / 277202
页数:4
相关论文
共 46 条
[1]   ROUNDING OF 1ST-ORDER PHASE-TRANSITIONS IN SYSTEMS WITH QUENCHED DISORDER [J].
AIZENMAN, M ;
WEHR, J .
PHYSICAL REVIEW LETTERS, 1989, 62 (21) :2503-2506
[2]   Hybrid Monte Carlo algorithm for the double exchange model [J].
Alonso, JL ;
Fernández, LA ;
Guinea, F ;
Laliena, V ;
Martín-Mayor, V .
NUCLEAR PHYSICS B, 2001, 596 (03) :587-610
[3]  
ANDO Y, CONDMAT0104163
[4]   Lattice displacements above TC in the layered manganite La1.2Sr1.8Mn2O7 [J].
Argyriou, DN ;
Bordallo, HN ;
Mitchell, JF ;
Jorgensen, JD ;
Strouse, GF .
PHYSICAL REVIEW B, 1999, 60 (09) :6200-6203
[5]   Percolation mechanism for colossal magnetoresistance [J].
Bastiaansen, PJM ;
Knops, HJF .
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1998, 59 (03) :297-303
[6]  
CARDY J, CONDMAT9806355
[7]   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
[8]   Phase separation and low-field bulk magnetic properties of Pr0.7Ca0.3MnO3 -: art. no. 172408 [J].
Deac, IG ;
Mitchell, JF ;
Schiffer, P .
PHYSICAL REVIEW B, 2001, 63 (17) :1724081-1724085
[9]   Anomalous proximity effect in underdoped YBa2Cu3O6+x Josephson junctions [J].
Decca, RS ;
Drew, HD ;
Osquiguil, E ;
Maiorov, B ;
Guimpel, J .
PHYSICAL REVIEW LETTERS, 2000, 85 (17) :3708-3711
[10]   Evidence for magnetic polarons in the magnetoresistive perovskites [J].
DeTeresa, JM ;
Ibarra, MR ;
Algarabel, PA ;
Ritter, C ;
Marquina, C ;
Blasco, J ;
Garcia, J ;
delMoral, A ;
Arnold, Z .
NATURE, 1997, 386 (6622) :256-259