Effect of spin-glass order on magnetic polarons in semimagnetic semiconductors

被引:8
作者
Chudnovskiy, AL [1 ]
Oppermann, R [1 ]
Rosenow, B [1 ]
Yakovlev, DR [1 ]
Zehnder, U [1 ]
Ossau, W [1 ]
机构
[1] UNIV WURZBURG,INST PHYS,D-97074 WURZBURG,GERMANY
来源
PHYSICAL REVIEW B | 1997年 / 55卷 / 16期
关键词
D O I
10.1103/PhysRevB.55.10519
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A theory accounting for the specific features of magnetic polarons (MP's) in the presence of spin-glass order is presented. We derive and solve self-consistent equations for (i) the polaron magnetization, (ii) the thermodynamically averaged carrier spin, and (iii) the spin-glass order parameter. The temperature dependence of these quantities is analyzed in detail. The modification of the spin-glass phase due to the presence of the exchange field of the carrier inside the magnetic polaron volume is investigated. The onset of spin-glass order leads to a plateaulike flattening in the temperature dependence of the MP energy at low temperatures. It is found that solutions of spin-glass equations are needed to optimally fit the experimental data of the;temperature dependence of the exciton magnetic polaron energy in (Cd,Mn)Te. Moreover, the dynamical aspects of the MP formation are discussed. Our model predicts qualitatively different temperature dependences of the MP formation time in different dynamical scenarios.
引用
收藏
页码:10519 / 10527
页数:9
相关论文
共 27 条
[1]  
[Anonymous], COMMUNICATION
[2]  
Benoit a la Guillaume C., 1993, Physica Status Solidi B, V175, P369, DOI 10.1002/pssb.2221750208
[3]   SPIN-GLASSES - EXPERIMENTAL FACTS, THEORETICAL CONCEPTS, AND OPEN QUESTIONS [J].
BINDER, K ;
YOUNG, AP .
REVIEWS OF MODERN PHYSICS, 1986, 58 (04) :801-976
[4]   MAGNETIC POLARON EFFECTS FOR EXCITONS IN NARROW CDTE-(CD,MN)TE QUANTUM-WELLS [J].
DASILVA, CETG .
PHYSICAL REVIEW B, 1986, 33 (04) :2923-2925
[5]   DYNAMICS OF SPIN ORGANIZATION IN DILUTED MAGNETIC SEMICONDUCTORS [J].
DIETL, T ;
PEYLA, P ;
GRIESHABER, W ;
DAUBIGNE, YM .
PHYSICAL REVIEW LETTERS, 1995, 74 (03) :474-477
[6]  
Fisher K.H., 1991, Spin glasses
[7]  
Furdyna J. K., 1988, DILUTED MAGNETIC SEM
[8]   DILUTED MAGNETIC SEMICONDUCTORS [J].
FURDYNA, JK .
JOURNAL OF APPLIED PHYSICS, 1988, 64 (04) :R29-R64
[9]   RELATION OF MAGNETO-OPTICAL PROPERTIES OF FREE-EXCITONS TO SPIN ALIGNMENT OF MN2+ IONS IN CD1-XMNXTE [J].
GAJ, JA ;
PLANEL, R ;
FISHMAN, G .
SOLID STATE COMMUNICATIONS, 1979, 29 (05) :435-438
[10]   THEORY OF 2-DIMENSIONAL MAGNETIC POLARONS IN AN EXTERNAL MAGNETIC-FIELD [J].
KAVOKIN, AV ;
KAVOKIN, KV .
SEMICONDUCTOR SCIENCE AND TECHNOLOGY, 1993, 8 (02) :191-196