Volume 91, Number 5, September 2010
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||03 September 2010|
Critical properties of the 3D-Heisenberg ferromagnet CdCr2Se4
High Magnetic Field Laboratory, Chinese Academy of Sciences - Hefei 230031, PRC
2 College of Science, Nanjing University of Aeronautics and Astronautics - Nanjing 210016, PRC
3 Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China Hefei 230026, PRC
4 Department of Physics and Electronic Engineering, Hefei Normal University - Hefei 230061, PRC
Accepted: 18 August 2010
The critical properties of the ferromagnet CdCr2Se4 around the paramagnetic-ferromagnetic phase transition have been investigated. It is found that the 3D-Heisenberg model is the best one to describe the critical phenomena around the critical point. Critical exponents ß =0.337±0.03 and γ=1.296±0.109 at TC=130.48±0.34 are obtained. In addition, the critical exponent δ=4.761±0.129 is determined separately from the isothermal magnetization at TC. These critical exponents fulfill the Widom scaling relation δ=1+γ/β. Based on these critical exponents, the magnetization-field-temperature (M-H-T) data around TC collapses into two curves obeying the single scaling equation M(H, ε)=εβf±(H/εβ+γ). Although the 3D-Heisenberg model is the most satisfactory model to describe this system, critical exponents for CdCr2Se4 are slightly smaller than the theoretical exponents (β=0.36, γ=1.39 and δ=4.8). This indicates that the exchange interaction J(r) decays slower than r− 5 in this system, which can be attributed to the spin-lattice coupling.
PACS: 76.50.+g – Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance / 75.40.-s – Critical-point effects, specific heats, short-range order / 76.30.-v – Electron paramagnetic resonance and relaxation
© EPLA, 2010
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