Evaluation of evidence for magnetic polarons in EuB6 -: art. no. 092408

被引：23

作者：

Calderón, MJ

Wegener, LGL

Littlewood, PB

机构：

[1] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[2] Los Alamos Natl Lab, Natl High Magnet Field Lab, Pulsed Field Facil, Los Alamos, NM 87545 USA

来源：

PHYSICAL REVIEW B | 2004年 / 70卷 / 09期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.70.092408

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Spin flip Raman scattering measurements on the semi-metal EuB6 show the appearance of a Stokes' shift above the ferromagnetic critical temperature. This has been interpreted as arising from the formation of magnetic polarons. However, this data contains a previously unremarked puzzle, in that the energy scale turns out to be considerable lower than expected based on reliable estimates of the exchange interaction mediated by electrons. We propose the Stokes' shift is due to the much smaller on-site coupling of holes with the local spins.

引用

页码：092408 / 1

页数：4

共 31 条

[1]

ABRIKOSOV AA, 1972, SOLID STATE THEORY S, V12, pCH6

[2] Fermi surface of the ferromagnetic semimetal, EuB6 [J].

Aronson, MC ;

Sarrao, JL ;

Fisk, Z ;

Whitton, M ;

Brandt, BL .

PHYSICAL REVIEW B, 1999, 59 (07) :4720-4724

[3] Scaling between magnetization and Drude weight in EuB6 -: art. no. 121102 [J].

Broderick, S ;

Ruzicka, B ;

Degiorgi, L ;

Ott, HR ;

Sarrao, JL ;

Fisk, Z .

PHYSICAL REVIEW B, 2002, 65 (12) :1211021-1211024

[4] Magnetic phase separation in EuB6 detected by muon spin rotation -: art. no. 020401 [J].

Brooks, ML ;

Lancaster, T ;

Blundell, SJ ;

Hayes, W ;

Pratt, FL ;

Fisk, Z .

PHYSICAL REVIEW B, 2004, 70 (02) :020401-1

[5] Stability and dynamics of free magnetic polarons [J].

Calderón, MJ ;

Brey, L ;

Littlewood, PB .

PHYSICAL REVIEW B, 2000, 62 (05) :3368-3371

[6] High pressures and ferromagnetic order in EuB6 [J].

Cooley, JC ;

Aronson, MC ;

Sarrao, JL ;

Fisk, Z .

PHYSICAL REVIEW B, 1997, 56 (22) :14541-14546

[7] EFFECT OF FLUCTUATIONS OF MAGNETIZATION ON THE BOUND MAGNETIC POLARON - COMPARISON WITH EXPERIMENT [J].

DIETL, T ;

SPALEK, J .

PHYSICAL REVIEW LETTERS, 1982, 48 (05) :355-358

[8] EFFECT OF THERMODYNAMIC FLUCTUATIONS OF MAGNETIZATION ON THE BOUND MAGNETIC POLARON IN DILUTE MAGNETIC SEMICONDUCTORS [J].

DIETL, T ;

SPALEK, J .

PHYSICAL REVIEW B, 1983, 28 (03) :1548-1563

[9] MAGNETIC POLARONS IN EXCITON LUMINESCENCE OF CD1-XMNXTE [J].

GOLNIK, A ;

GINTER, J ;

GAJ, JA .

JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1983, 16 (31) :6073-6084

[10]

Goodenough J. B., 1963, MAGNETISM CHEM BOND

← 1 2 3 4 →