期刊
PHYSICAL REVIEW B
卷 68, 期 22, 页码 -出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevB.68.220408
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We report the results of magnetic susceptibility, specific heat, synchrotron x-ray, and neutron powder diffraction measurements for the normal spinel GeNi2O4, which becomes antiferromagnetic below a Neel temperature (T-N) of 12 K. The Neel transition occurs in two discrete steps, separated in temperature by 0.6 K. The total magnetic entropy evaluated from the specific heat data is only similar to1/2 of the expected 2R ln 3 per mole of GeNi2O4. The specific heat data also suggest the presence of both gapless and gapped excitations within the Neel state. GeNi2O4 remains cubic to temperatures well below T-N.
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