Spin-glass behavior in KxRu4-yNiyO8 hollandite materials

Journal article


Vera-Stimpson, L. 2018. Spin-glass behavior in KxRu4-yNiyO8 hollandite materials. Physical Review B (PRB). 98 (17). https://doi.org/10.1103/PhysRevB.98.174429
AuthorsVera-Stimpson, L.
Abstract

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.

Year2018
JournalPhysical Review B (PRB)
Journal citation98 (17)
PublisherAmerican Physical Society
Digital Object Identifier (DOI)https://doi.org/10.1103/PhysRevB.98.174429
Publication dates
Print26 Nov 2018
Publication process dates
Deposited30 Nov 2018
Accepted30 Oct 2018
Accepted author manuscript
Output statusPublished
ContributorsPowell, J., Stenning, G., Jura, M. and Arnold, D.
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https://repository.canterbury.ac.uk/item/88xxy/spin-glass-behavior-in-kxru4-yniyo8-hollandite-materials

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