Selenium doping induced two antiferromagnetic transitions in thiospinel compounds CuCo2S4‐xSex (0 ≤ x ≤ 0.8)
Abstract
A series of copper thiospinel compounds, CuCo2S4‐xSex (x = 0, 0.2, 0.4, 0.6, 0.8), have been successfully synthesized by solid‐state reaction and their structure and magnetic properties have been studied. The Rietveld refinements of X‐ray diffractions indicate that both the lattice constants and the nearest‐neighbor Cu‐Cu distances increase with increasing selenium doping. A weakly antiferromagnetic transition occurring at about 4 K is observed in CuCo2S4. Two antiferromagnetic transitions at about 3.5 K and 6 K are observed in selenium‐doped samples, which suggest that the exchange couplings associated with Cu‐S(Se)‐Cu and Cu‐Se(S)‐Cu, respectively, are responsible for the two antiferromagnetic transitions. Detailed analysis of the experimental results further indicates that the nearest‐neighbor molecular field coefficient is comparable to the next‐neighbor molecular field coefficient. We propose a reasonable model to explain this phenomenon.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Dec 20, 2020
- Source ID
- 10.1111/jace.17607
Entities
People
- Hao Wu
- Jincang Zhang
- Jingying Si
- Jun‐yi Ge
- Ke Wang
- Nai‐chang Yeh
- Qiang Hou
- Shixun Cao
- Tao Li
- Wenlai Lv
- Zhenjie Feng
Organizations
- Army Research Office
- California Institute of Technology
- Ministry of Science and Technology of the People's Republic of China
- National Natural Science Foundation of China
- National Science Foundation
- Shanghai Municipal Science and Technology Commission
- Shanghai University