UNUSUAL MAGNETIC, TRANSPORT AND THERMODYNAMICAL PROPERTIES OF THE URANIUM TERNARIES UNISN, UPDIN AND UNIGA

Citation
H. Fujii et al., UNUSUAL MAGNETIC, TRANSPORT AND THERMODYNAMICAL PROPERTIES OF THE URANIUM TERNARIES UNISN, UPDIN AND UNIGA, Physica. B, Condensed matter, 192(3), 1993, pp. 219-227
Citations number
41
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics, Condensed Matter
ISSN journal
0921-4526
Volume
192
Issue
3
Year of publication
1993
Pages
219 - 227
Database
ISI
SICI code
0921-4526(1993)192:3<219:UMTATP>2.0.ZU;2-Y
Abstract
We present our recent results of systematic experimental work on magne tic, transport and thermodynamical properties of the equiatomic ternar ies UNiSn, UPdIn and UNiGa. UNiSn with cubic MgAgAs-type structure exh ibits a semi-conductor-to-metal transition associated with a type-I an tiferromagnetic ordering. Both UPdIn and UNiGa crystallize in the hexa gonal ZrNiAl-type structure. UPdIn is the first example of a two-dimen sional heavy-fermion system accompanied by a pseudogap formation along the c-axis due to the development of the c-axis modulated magnetic st ructure. UNiGa exhibits a giant magnetoresistance being as large as DE LTArho/rho congruent-to 90% at T = 1.5 K for the current parallel to t he c-axis, which is a result of the antiferromagnetic-to-ferromagnetic transition occurring at B=0.7 T. All of these unusual physical proper ties can be a consequence of the change in the hybridization of the hi ghly correlated 5f-electrons with s, p or d electron states by the dev elopment of magnetic ordering or the magnetic order-order transition.