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Spin-glass behaviour in KxRu4-yNiyO8 hollandite materials

Stimpson, Laura J. Vera, Jessica M., Powell, Stenning, Gavin B. G., Jura, Marek, Arnold, Donna C. (2018) Spin-glass behaviour in KxRu4-yNiyO8 hollandite materials. Physical Review B: Condensed Matter and Materials Physics, 98 (17). ISSN 0163-1829. (doi:10.1103/PhysRevB.98.174429)

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We report the synthesis and comprehensive ac and dc susceptibility measurements of KxRu4−yNiyO8 hollandite. The value of the relative frequency shift, δTf, has been determined as 0.025 which is within the range expected for spin-glass systems (0.005–0.06). Additionally, the characteristic flipping time of a single spin flip, τ0, and the dynamical critical exponent, −zv, were determined to have values of 5.82×10−8s and 6.1(3), respectively from the power law. While the value of τ0 is comparatively very large, −zv is consistent with what is expected for spin-glass systems. Field-cooled hysteresis behavior demonstrates a small increase in the remnant magnetization (at 2 K) on increasing the strength of the cooling field, suggesting that the degree of short-range correlations increases consistent with the formation of larger spin clusters. Thermoremnant magnetization data indicate an exponential-like decay of the magnetization as a function of time with the remnant magnetization remaining nonzero. However, it is clear from these data that multiple components contribute to the decay behavior. Collectively, these data confirm spin-glass character for K0.73(3)Ni1.9(5)Ru2.1(5)O8 and clearly demonstrate that the magnetic behavior of this material is far from simplistic.

Item Type: Article
DOI/Identification number: 10.1103/PhysRevB.98.174429
Uncontrolled keywords: frustrated magnetism; magnetic susceptibility; magnetism; alkaline earth metals; alloys; oxides; spin glasses; susceptibility measurements
Subjects: Q Science > QC Physics
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Donna Arnold
Date Deposited: 15 Nov 2018 16:54 UTC
Last Modified: 12 Jul 2019 10:33 UTC
Resource URI: (The current URI for this page, for reference purposes)
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