A multi-frequency EPR spectroscopy approach in the detection of boson peak excitations |
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Authors: | Kveder Marina Merunka Dalibor Ilakovac Amon Rakvin Boris |
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Institution: | Ru?er Bo?kovi? Institute, Bijeni?ka 54, 10000 Zagreb, Croatia. kveder@irb.hr |
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Abstract: | 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. |
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