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.

引用

页数：5

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