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Magnetization steps due to pairs of distant-neighbor spins in Zn1-xCoxSe and Zn1-xCoxS

1990; Elsevier BV; Volume: 75; Issue: 3 Linguagem: Inglês

10.1016/0038-1098(90)90269-h

1879-2766

Y. Shapira, Tianlin Yu, Bayo Lau, S. Foner, E. J. McNiff, D. Heiman, C. Thieme, C-M. Niu, R. Kershaw, K. Dwight, A. Wold, V. Bindilatti,

Magnetic properties of thin films

Magnetization steps (MSTs) were observed in Zn1-xCoxSe and Zn1-xCoxS using temperatures T < 1 K, steady magnetic fields up to 200 kOe, and pulsed fields up to ∼400 kOe. Unlike the MSTs observed earlier in other materials, these MSTs are due to pairs of distant-neighbor spins rather than to pairs of nearest-neighbor spins. For Zn1-xCoxSe the results give a second-neighbor exchange constant J2/kB = −3.04±0.1 K, and suggest a third-neighbor exchange constant J3/kB ≌ −0.8 K. An exchange constant J/kB = −2.25±0.2 K observed in Zn1-xCoxS is either J2 or J3.