Korringa-like relaxation in the high-temperature phase of A-site ordered YBaMn2O6

被引：18
|
作者：
Schaile, S. [1 ]
von Nidda, H. -A. Krug [1 ]
Deisenhofer, J. [1 ]
Loidl, A. [1 ]
Nakajima, T. [2 ]
Ueda, Y. [2 ]
机构：
[1] Univ Augsburg, Inst Phys, Ctr Elect Correlat & Magnetism, D-86135 Augsburg, Germany
[2] Univ Tokyo, Inst Solid State Phys, Mat Design & Characterizat Lab, Kashiwa, Chiba 2778581, Japan
来源：
PHYSICAL REVIEW B | 2012年 / 85卷 / 20期
关键词：
ELECTRON-SPIN-RESONANCE; LINEWIDTH; ESR; TRANSITIONS; DEPENDENCE; DYNAMICS; EPR;
D O I：
10.1103/PhysRevB.85.205121
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report on high-temperature electron spin resonance studies of A-site ordered YBaMn2O6 and disordered Y0.5Ba0.5MnO3. In the disordered sample we find that the linewidth is governed by spin-spin relaxation processes as in many other manganite systems. In contrast we find a Korringa-like spin relaxation with a slope of about 1Oe/K above the charge-ordering transition and extending up to 930 K in the metal ordered YBaMn2O6 samples. A Korringa law is a clear feature of a truly metallic state, pointing to an unconventional high-temperature phase of these ordered manganites. In agreement with the electron spin resonance (ESR) intensity this suggests that in the metallic high-temperature phase the ESR signal stems from Mn4+ core spins which relax via the quasidelocalized e(g) electrons.
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页数：5
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