Spin-glass behavior in KxRu4-yNiyO8 hollandite materials

Vera Stimpson, L. (2018) Spin-glass behavior in KxRu4-yNiyO8 hollandite materials. Physical Review B (PRB), 98 (17).

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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 5.82×10−8 s 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
Subjects: Q Science > QC Physics
Q Science > QD Chemistry > QD0146 Inorganic chemistry
Q Science > QD Chemistry > QD0450 Physical and theoretical chemistry
Q Science > QD Chemistry > QD0901 Crystallography
Divisions: Faculty of Social and Applied Sciences > School of Law, Criminal Justice and Computing
Depositing User: Laura Vera-Stimpson
Date Deposited: 30 Nov 2018 16:19
Last Modified: 13 Dec 2018 08:00
URI: https://create.canterbury.ac.uk/id/eprint/17829

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Last edited: 29/06/2016 12:23:00