A multi-frequency EPR spectroscopy approach in the detection of boson peak excitations

被引：3

作者：

Kveder, Marina ^{[1
]}

Merunka, Dalibor ^{[1
]}

Ilakovac, Amon ^{[2
]}

Rakvin, Boris ^{[1
]}

机构：

[1] Rudjer Boskovic Inst, Zagreb 10000, Croatia

[2] Fac Sci, Zagreb 10000, Croatia

来源：

JOURNAL OF MAGNETIC RESONANCE | 2011年 / 213卷 / 01期

关键词：

Boson peak; Multi-frequency EPR; Electron spin-lattice relaxation; ELECTRON-SPIN RELAXATION; LATTICE-RELAXATION; SATURATION RECOVERY; DISORDER; MODES;

D O I：

10.1016/j.jmr.2011.08.029

中图分类号：

Q5 [生物化学];

学科分类号：

071010 ; 081704 ;

摘要：

The influence of boson peak (BP) excitations on low-temperature spin-lattice relaxation rate of a paramagnetic center embedded in a glassy matrix is investigated in the context of multi-frequency electron paramagnetic resonance (EPR) detection. In the theoretical analysis, the transition rate of spin one-half in the presence of a phonon field is calculated within the approximation of Fermi's golden rule. Several phonon densities of states are compared, among which one originating from a model of quasi-localized vibrations has been introduced into electron spin relaxation formalism for the first time. The respective frequency dependencies of spin-lattice relaxation rates are predicted which should lead to observable effects of BP modes if a multi-frequency study at very low temperatures is performed. (C) 2011 Elsevier Inc. All rights reserved.

引用

页码：26 / 31

页数：6

共 38 条

[31] Thermal conductivity of glassy materials and the "boson peak" [J].