Thermal Expansion of NiS_2, Ni_<0.9>Co_<0.1>S_2, Ni_<0.9>Cu_<0.1>S_2 and Ni_<0.95>Cu_<0.05>S_2
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The thermal expansion of NiS_2, Ni_<0.9>Co_<0.1>S_2, Ni_<0.9>Cu_<0.1>S_2 and Ni_<0.95>Cu_<0.05>S_2 has been measured from 4.2 K to room temperature. The anomalies, which correspond to antiferromagnetic ordering and to appearance of weak ferromagnetism, have been observed in all specimens. The lattice, electronic and magnetic Gruneisen constans are determined. The magnetic Gruneisen constant changes its sign from negative to positive corresponding to the metal-semiconductor transition which occurs between Ni_<0.9>Co_<0.1>S_2 and Ni_<0.93>Co_<0.07>S_2.
- 社団法人日本物理学会の論文
- 1976-05-15
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