Critical behavior of single crystal CuCr2Se4−xBrx (x=0.25) View Full Text


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Article Info

DATE

2013-01-23

AUTHORS

Lei Zhang, Jiyu Fan, Xiangde Zhu, Wei Ning, Zhe Qu, Min Ge, Li Pi, Yuheng Zhang

ABSTRACT

The doping of bromine has prominent effect on the transport properties of CuCr2Se4, where the conductivity of CuCr2Se4−xBrx changes from metallic behavior with x=0 to semiconductor with x=1. In this work, the critical behavior of single crystal CuCr2Se4−xBrx with x=0.25, which lies at the boundary between the metallic and insulating state, is investigated through the magnetization under high magnetic field. The critical exponents β=0.39±0.03 and γ=1.25±0.05 are obtained by the Kouvel–Fisher method, and δ=4.79±0.01 is generated by the critical iso-thermal analysis. The obtained exponent β is close to the prediction of the three-dimensional (3D) Heisenberg model, while γ approaches that of the 3D-Ising model. Although the bromine doping has prominent effect on the transport behavior, the critical exponents are hardly changed. The obtained results indicate that the ferromagnetism is established through one-dimensional Cr–Se–Cr bonds. However, the nearest-neighbor magnetic interaction belonging to the 3D-Heisenberg model also contributes to the ferromagnetic exchange. More... »

PAGES

201-206

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00339-012-7515-0

DOI

http://dx.doi.org/10.1007/s00339-012-7515-0

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1007847927


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