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Spin relaxation in 3Zn(PO3)(2). 2Mn(PO3)(2) phosphate glass - The role of low-energy vibrational modes
Authors: Tkac Volodymyr | Tarasenko Robert | Cizmar E | Orendacova Alzbeta | Tibenska Kristina | Holubová Jana | Černošková Eva | Černošek Zdeněk | Orendac Martin
Year: 2021
Type of publication: článek v odborném periodiku
Name of source: Journal of Alloys and Compounds
Publisher name: Elsevier Science SA
Place: Lausanne
Page from-to: 156910
Titles:
Language Name Abstract Keywords
cze Spinová relaxace fosfátového skla 3Zn(PO3)(2).2Mn(PO3)(2) - role nízkoenergetických vibračních módů Termodynamické a magnetické vlastnosti fosfátového skla složení 3Zn(PO3)(2).2Mn(PO3)(2) v širokém rozsahu teplot a magnetického pole. Studium statické magnetické susceptibility a specifické tepelné kapacity ukázalo na formování spinového skla při 0,4 K. teplotní vodivost; mangan; dynamika
eng Spin relaxation in 3Zn(PO3)(2). 2Mn(PO3)(2) phosphate glass - The role of low-energy vibrational modes Thermodynamic and magnetic properties of 3Zn(PO3)(2)center dot 2Mn(PO3)(2) phosphate glass at wide temperature and magnetic field range were investigated. The study of static magnetic susceptibility and specific heat ruled out the formation of a spin glass state down to 0.41 K. Short-range order in the magnetic subsystem can be approximated by S = 5/2 antiferromagnetic dimers with weak uniaxial anisotropy. The results of alternating susceptibility studies revealed that below 10 K temperature-independent process dominates, which was ascribed to cross-tunneling relaxation. In contrast, thermally activated relaxation found at higher temperatures was identified as the Raman process. The analysis of the boson peak in lattice specific heat and thermal conductivity using soft potential model yielded the estimation of loffe-Riegel crossover (h) over bar omega(IR)/k(B) = 25.8K. Short-wavelength phonons with frequencies higher than omega(IR) are proposed to mediate Raman relaxation, whereas acoustic phonons remain inactive. (C) 2020 Elsevier B.V. All rights reserved. thermal-conductivity; manganese; dynamics

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