Magnetic and electrical transport behavior in the crystallographically disordered compound U2CoSi3

Abstract

A single crystal of the uranium-based ternary silicide U 2 CoSi 3 has been investigated by means of magnetic, heat capacity, and electrical resistivity measurements, performed in wide ranges of the temperature and magnetic field. The compound crystallizes with a hexagonal AlB 2 -type structure with crystallographic disorder in the nonmagnetic atom sublattice. The results indicate the formation at low temperatures of a ferromagnetic clusterglass state, which likely originates from crystallographic disorder in the nonmagnetic atom sublattice of the hexagonal AlB 2 -type unit cell. The low-temperature behavior of the electrical resistivity of U 2 CoSi 3 can be adequately described in terms of theories developed for disordered systems.

Quantum Interference in Disordered Ferromagnet U2NiSi3

“…Recently a square-root-of-T increase of the electrical resistivity was found for a cluster-glass compound U 2 CoSi 3 that is isostructural to U 2 NiSi 3 [12]. The overall temperature and magnetic eld dependences of the electrical transport in this material were successfully interpreted by taking into account quantum interference eects, which result from distinct crystallographic disorder.…”

Cluster-glass behavior induced by local moment doping in the itinerant ferromagnet Sc3.1In

“…16 Antiferromagnetic coupling [17][18][19] lends itself more readily to geometric frustration than ferromagnetic coupling, explaining the limited number of metallic, ferromagnetically coupled cluster-glass systems. Several cases are known, where a cluster-glass state arises from a ferromagnetic ground state in metal oxides, [20][21][22][23] 26,27 dynamic fluctuations of crystalfield levels have been suggested as the underlying mechanism for the magnetic frustration in PrRhSn 3 , 28 based on the fact that neither site disorder nor geometric frustration is present in this compound. The current study shows that the addition of Er 3+ local moments in the ferromagnet Sc 3.1 In induces a cluster-glass state in (Sc 1−x Er x ) 3.1 In (0 < x 0.10), while the Weiss-like temperature θ , a measure of the local-to-itinerant moment coupling, remains positive.…”

Ferromagnetic ordering in single-crystalline U2RhSi3 with fully ordered crystal structure

“…It should be noted, however, that the studied polycrystal formed with a partly disordered crystal structure (see the Introduction), and hence the low-temperature features could be attributed to atomic disorder effects. It is worth recalling that very similar upturns in r(T) were recently observed for single crystals of U 2 CoSi 3 and U 2 NiSi 3 with the disordered AlB 2 -type crystal structures, and ascribed to quantum interference effects arising due to crystallographic disorder [2,23].…”