Resonant scattering of phonons in the quasi-one-dimensional spin-chain compounds AB2O6 (A = Ni, Co; B = Sb, Ta)

We report measurements of thermal conductivity (κ) on single crystals of the quasi-one-dimensional antiferromagnetic spin-chain compounds AB2O6 (A = Ni, Co; B = Sb, Ta) in the temperature range 5≤T≤300 K. We find that κ for all crystallographic directions is substantially suppressed in the Ta compou...

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Bibliographic Details
Published in:Physical review. B 2018-10, Vol.98 (13), p.134449
Main Authors: Prasai, N, Christian, A B, Neumeier, J Neumeier, Cohn, J L
Format: Article
Language:English
Subjects:
Antiferromagnetism
Antimony compounds
Chains
Crystal structure
Crystallography
Nickel compounds
Phonons
Scattering
Single crystals
Tantalum compounds
Thermal conductivity
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Summary:We report measurements of thermal conductivity (κ) on single crystals of the quasi-one-dimensional antiferromagnetic spin-chain compounds AB2O6 (A = Ni, Co; B = Sb, Ta) in the temperature range 5≤T≤300 K. We find that κ for all crystallographic directions is substantially suppressed in the Ta compounds in comparison to those of the Sb compounds despite their very similar magnetic and crystallographic structures. The data are well described by resonant scattering of phonons from two-level systems, with energy splittings of ∼100–150 K and scattering strength an order of magnitude greater in the Ta compounds. We distinguish the effects of phonon-spin interactions from those related to changes in the low-energy phonon spectra caused by the different B-site ions.
ISSN:2469-9950
2469-9969