2017/06/22 by Yu Liu, C. Petrovic · 1 citation
Physics and Astronomy · #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.96.054406
published as Phys. Rev. B 96, 054406 (2017)
arxiv created 2017/06/22 · arxiv updated 2017/08/16
The critical properties of the single-crystalline semiconducting ferromagnet CrGeTe3 were investigated by bulk dc magnetization around the paramagnetic to ferromagnetic phase transition. Critical exponents β= 0.200±0.003 with critical temperature Tc = 62.65±0.07 K and γ= 1.28±0.03 with Tc = 62.75±0.06 K are obtained by the Kouvel-Fisher method whereas δ= 7.96±0.01 is obtained by the critical isotherm analysis at Tc = 62.7 K. These critical exponents obey the Widom scaling relation δ= 1+γ/β, indicating self-consistency of the obtained values. With these critical exponents the isotherm M(H) curves below and above the critical temperatures collapse into two independent universal branches, obeying the single scaling equation m = f_±(h), where m and h are renormalized magnetization and field, respectively. The determined exponents match well with those calculated from the results of renormalization group approach for a two-dimensional Ising system coupled with long-range interaction between spins decaying as J(r)≈ r-(d+σ) with σ=1.52.