Spin-glass behavior in KxRu4−yNiyO8 hollandite materials

• Published in: Physical review. B 2018-11, Vol.98 (17), p.174429
• Main Authors: Vera Stimpson, Laura J, Powell, Jessica M, Stenning, Gavin B G, Jura, Marek, Arnold, Donna C
• Format: Article
• Language: English
• Subjects: Decay; Frequency shift; Magnetic permeability; Magnetic properties; Magnetization; Spin glasses
• ISSN: 2469-9950; 2469-9969
• DOI: 10.1103/PhysRevB.98.174429

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.