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)2·2Mn(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 s...

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Bibliographic Details
Published in:Journal of alloys and compounds 2021-01, Vol.851, p.156910, Article 156910
Main Authors: Tkáč, V., Tarasenko, R., Čižmár, E., Orendáčová, A., Tibenská, K., Holubová, J., Černošková, E., Černošek, Z., Orendáč, M.
Format: Article
Language:English
Subjects:
Anisotropy
Antiferromagnetism
Dimers
Lattice vibration
Magnetic permeability
Magnetic properties
Phonons
Phosphate glass
Short range order
Specific heat
Spin glasses
Subsystems
Thermal conductivity
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Summary:Thermodynamic and magnetic properties of 3Zn(PO3)2·2Mn(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 Ioffe-Riegel crossover ℏωIR/kB=25.8K. Short-wavelength phonons with frequencies higher than ωIR are proposed to mediate Raman relaxation, whereas acoustic phonons remain inactive. [Display omitted] •Existence of Bose peak in 3Zn(PO3)2·2Mn(PO3)2 phosphate glass.•Absence of a spin glass state.•Phonons above Ioeffe-Regel limit are proposed to govern the magnetic relaxation.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2020.156910