Magnetocrystalline anisotropy of the ferrimagnetic semiconductor CoCr2S4

Magnetocrystalline anisotropy of the ferrimagnetic semiconductor CoCr2S4
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DOI:
10.1016/0304-8853(80)90292-9
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发表时间:
1980
影响因子:
2.7
通讯作者:
A. Marais;M. Porte;I. Goldstein;P. Gibart
A. Marais;M. Porte;I. Goldstein;P. Gibart
中科院分区:
材料科学3区
文献类型:
--
作者:
A. Marais;M. Porte;I. Goldstein;P. Gibart

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CoCr_2S_4是一种铁磁n型超导体,Tc = 227 K,K_1(77 K)= 3.53 × 105 erg cm-3,H_2退火为3 × 105 erg cm-3,S_2退火为3.7 × 105 erg cm-3。硫空位存在于生长态样品中,充当双电荷施主。它们是由Cr ~(2+)金属空位进行电荷补偿的,推测Co ~(3+)可能出现在A位。A位的各向异性主要为Co ~(2+),各向异性系数为~(13)× 105。少量的Co ~(3+)(Td中的3d ~ 6,5E)和Cr ~(2+)(B位D_3d对称中的3d ~ 4)产生大的正K_1值。
CoCr2S4is a ferrimagnetic n-type semiconductorTc= 227 K.K1(77 K) = 3.53 × 105erg cm-3for as-grown CoCr2S4, 3 × 105for H2annealed, and 3.7 × 105for S2annealed. Sulfur vacancies exist in as-grown samples which act as doubly charged donors. They are charge compensated by Cr2+metal vacancies and it is assumed that Co3+could appear in A site. The main anisotropy ≅ 3 × 105is due to Co2+in A site. A small amount of Co3+(3d6,5E in Td) and Cr2+(3d4in D3dsymmetry of B site) give large positiveK1values.