Gap Formation in a Valence Fluctuation System of CeNiSn

Abstract

We have found that CeNiSn is a typical valence fluctuating compound with a pseudo gap near the Fermi level. The valence fluctuating state in CeNiSn is gradually converted to Kondo regime by a partial replacement of Ni by Cu.

Anomalous Magnetic Properties of URuGa

“…Below 7 K, the resistivity (in zero field) increases according to the activated energy law with Eα = 1.9 meV. This behaviour resembles that reported for CeNiSn [13,14] or CeRhSb [15,16]. Ιn the latter cases, the phenomenon has been interpreted as a result of the hybridization gap-formation in the electronic density of states.…”

“…In summary, it is clear that our data for polycrystalline URuGa have a number of similarities to the valence-fluctuating Kondo insulators [13][14][15][16] as well as to the non-Fermi liquid compounds [12], so that there is a possibility of the K o n d o -e f f e c t b e l a v i o u r a t h i g h t e m p e r a t u r e s a n d n o n -F e r m i l i q u i d o n e o r / a n d the gap-formation at low temperatures. We do not exclude the presence of ferromagnetic (paramagnetic) impurities or a sign of forming the magnetic-correlation effect at low temperatures, which in turn becomes enhanced rapidly by even small substitution of Pd for Ru in URuGa [10].…”

Electronic and magnetic properties and chemical bonding ofCeMSn(M=Rh,Ru)Matar1, Riecken2, Chevalier3 et al. 2007Phys. Rev. B504592View full textAdd to dashboardCite

“…CeNiSn, 1 CeRhSn, 2 and CeIrSn 3 are intermediate valence systems, while CePdSn (T N = 7.5 K) 4 and CePtSn (T N = 8 K) (see Ref. 5 and references therein) are antiferromagnetic Kondo lattices.…”

On the low-temperature thermal properties and low-energy Fermi excitations in CeNiSn

“…Among these systems there are compounds Ce3Bi4Pt3, U3Sb4Pta with a well-defined and wide enough energy gap A ~ 50-200 K [2,3], and the equiatomic compounds CeNiSn I-4, 5] and CeRhSb 1-6] where the energy gap (or quasigap) was estimated as A < 10 K. Its existence in CeNiSn was established by studying the thermal, magnetic, transport and elastic properties. (see [1][2][3][4][5][6][7] for a review of recent experimental results).…”