Ground state and low-energy magnetic dynamics in the frustrated magnet CoAl2O4 as revealed by local spin probes

被引：18

作者：

Iakovleva, M. ^{[1
,2
,3
]}

Vavilova, E. ^{[1
]}

Grafe, H. -J. ^{[2
]}

Zimmermann, S. ^{[2
,4
]}

Alfonsov, A. ^{[2
]}

Luetkens, H. ^{[5
]}

Klauss, H. -H. ^{[4
]}

Maljuk, A. ^{[2
]}

Wurmehl, S. ^{[2
]}

Buechner, B. ^{[2
,4
]}

Kataev, V. ^{[2
]}

机构：

[1] Russian Acad Sci, Zavoisky Phys Tech Inst, Kazan 420029, Russia

[2] IFW Dresden, Leibniz Inst Solid State & Mat Res, D-01171 Dresden, Germany

[3] Kazan Fed Univ, Kazan 420008, Russia

[4] Tech Univ Dresden, Inst Solid State Phys, D-01069 Dresden, Germany

[5] Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland

来源：

PHYSICAL REVIEW B | 2015年 / 91卷 / 14期

基金：

俄罗斯基础研究基金会;

关键词：

LATTICE ANTIFERROMAGNET; CRYSTALS; LIQUID; ORDER;

D O I：

10.1103/PhysRevB.91.144419

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report a combined experimental study of magnetic properties of a single crystal of the frustrated diamond lattice antiferromagnet CoAl2O4 with Co2+ electron spin resonance, Al-27 nuclear magnetic resonance, and muon spin rotation/relaxation techniques. With our local probes, we show that the frustration of spin interactions and the Co/Al site disorder strongly affect the spin dynamics. The experimental results evidence inhomogeneous and slow magnetic fluctuations and the occurrence of short-range electron spin correlations far above a characteristic temperature T* = 8 K at which the spin system turns into in a quasistatic state. Our data indicate that this spin order is likely short range and unconventional with spin fluctuations persistent even at T << T*. The results of three spectroscopy techniques highlight a nontrivial role of structural disorder for the magnetism of a frustrated diamond spin lattice at the proximity to the critical point.

引用

页数：11

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