Field-induced spin-structural transition and giant magnetostriction in Ising chain α-CoV₂O₆

2013/05/22 by Nandi, M., Khan, N., Bhoi, D. +2
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el)

paper · doi:10.48550/arxiv.1305.5027

Abstract

We have investigated the temperature and magnetic field dependence of magnetization, specific heat (C_p), and relative sample length change (ΔL/L₀) for understanding the field-induced spin-structural change in quasi-one-dimensional spin chain α-CoV₂O₆ which undergoes antiferromagnetic (AFM) transition below T_N=15 K. Analysis of C_p(T) shows that an effective S=1/2 Ising state is realized below 20 K, though the magnetic fluctuations persist well above T_N. C_p and the coefficient of linear thermal expansion (α) exhibit strong H dependence in the AFM state. We also observe a huge positive magnetostriction [ΔL(H)/L₀] below 20 K which does not show any tendency of saturation up to 9 T. With increasing field, a sharp and symmetric peak emerges below T_N in both C_p(T) and α(T) due to field-induced first order ferrimagnetic/ferromagnetic-paramagnetic transitions. The large value of magnetostriction below T_N suggests strong spin-lattice coupling in α-CoV₂O₆.

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