期刊
PHYSICAL REVIEW B
卷 78, 期 17, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.174406
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资金
- New Zealand Centre of Research
- New Zealand New Economy Research
- MacDiarmid Institute
- Royal Society of New Zealand
The magnetic behavior of SmN has been investigated in stoichiometric polycrystalline films. All samples show ferromagnetic order with Curie temperature (T(C)) of 27 3 K, evidenced by the occurrence of hysteresis below T(C). The ferromagnetic state is characterized by a very small moment and a large coercive field, exceeding even the maximum applied field of 6 T below about 15 K. The residual magnetization at 2 K, measured after cooling in the maximum field, is 0.035 mu(B) per Sm. Such a remarkably small moment results from a near cancellation of the spin and orbital contributions for Sm(+3) in SmN. Coupling to an applied field is therefore weak, explaining the huge coercive field. The susceptibility in the paramagnetic phase shows temperature-independent Van Vleck and Curie-Weiss contributions. The Van Vleck contribution is in quantitative agreement with the field-induced admixture of the J = 7/2 excited state and the 2 ground state. The Curie-Weiss contribution returns a Curie temperature that agrees with the onset of ferromagnetic hysteresis, and a conventional paramagnetic moment with an effective moment of 0.4 mu B per Sm ion, in agreement with expectations for the crystal-field modified effective moment on the Sm(+3) ions.
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