YBNISN, A FERROMAGNETIC KONDO LATTICE

被引:59
作者
BONVILLE, P
BELLOT, P
HODGES, JA
IMBERT, P
JEHANNO, G
LEBRAS, G
HAMMANN, J
LEYLEKIAN, L
CHEVRIER, G
THUERY, P
DONOFRIO, L
HAMZIC, A
BARTHELEMY, A
机构
[1] CENS, LAB LEON BRILLOUIN, GIF SUR YVETTE, FRANCE
[2] UNIV PARIS 11, PHYS SOLIDES LAB, F-91405 ORSAY, FRANCE
[3] CENT UNIV VENEZUELA, FAC CIENCIAS, CARACAS, VENEZUELA
[4] UNIV ZAGREB, FAC SCI, DEPT PHYS, YU-41000 ZAGREB, CROATIA
关键词
D O I
10.1016/0921-4526(92)90555-7
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
We present an investigation of the low temperature properties of the ternary intermetallic alloy YbNiSn by X-ray and neutron diffraction, resistivity, magnetisation and Yb-170 Mossbauer spectroscopy measurements. It is shown that YbNiSn is a ferromagnet (T(c) = 5.65 K) with the Yb3+ magnetic moments lying along the orthorhombic c axis. At low temperatures a strong anisotropy of the interionic exchange coupling is evidenced (lambda(c) congruent-to 100 kOe/mu(B), lambda(a) congruent-to 15 kOe/mu(B) which competes with the Crystal Electric Field anisotropy (g(c) congruent-to 1.67, g(a) congruent-to 3.72), leading to the unusual situation where the ferromagnetic moments do not lie along the easy magnetisation axis a. Hybridisation of the 4f electrons with band electrons leads to a reduction of the spontaneous moment (saturated value 0.85-mu(B)) and is likely to be the origin of the large value of the molecular field constant lambda(c) as well as of the anisotropy of the exchange interaction and of the resistivity.
引用
收藏
页码:105 / 117
页数:13
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