Multiple-timescale relaxation dynamics in CsGd(MoO4)2-a dipolar magnet with a highly anisotropic layered crystal structure

被引：15

作者：

Tkac, V. ^{[1
]}

Orendacova, A. ^{[1
]}

Tarasenko, R. ^{[1
]}

Cizmar, E. ^{[1
]}

Orendac, M. ^{[1
]}

Tibenska, K. ^{[2
]}

Anders, A. G. ^{[3
]}

Gao, S. ^{[4
]}

Pavlik, V. ^{[5
]}

Feher, A. ^{[1
]}

机构：

[1] Safarik Univ, Inst Phys, Kosice 04001, Slovakia

[2] Tech Univ, Fac Aeronaut, Kosice 04121, Slovakia

[3] Kharkov Low Temp Phys & Engn Inst, UA-10164 Kharkov, Ukraine

[4] Peking Univ, Beijing Natl Lab Mol Sci, State Key Lab Rare Earth Mat Chem & Applicat, Coll Chem & Mol Engn, Beijing 100871, Peoples R China

[5] SAS, Inst Expt Phys, Kosice 04001, Slovakia

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2013年 / 25卷 / 50期

关键词：

PARAMAGNETIC RELAXATION; THERMAL-CONDUCTIVITY; SOUND-ATTENUATION; EXPONENTS;

D O I：

10.1088/0953-8984/25/50/506001

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The dynamic properties of the dipolar magnet CsGd(MoO4)(2) have been studied. The frequency and temperature dependence of the AC susceptibility investigated in the paramagnetic region above 2 K revealed the co-existence of magnetic field induced slow and fast relaxation channels with a timescale differing by three orders of magnitude. The slow relaxation is determined by the properties of the first coordination sphere of the Gd3+ C ion and has the character of a two-phonon Orbach process. The fast relaxation is potentially attributed to a two-phonon Raman process realized via a localized phonon mode associated with the layered crystal structure. The temperature dependence of the phonon mean free path in zero magnetic field indicates significant phonon scattering below 1 K resulting from the combined effect of magnetic correlations and the scattering of dominant phonons with energies corresponding to the crystal-field levels.

引用

页数：10

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