Skip to Main content Skip to Navigation
Journal articles

Enhanced conduction band density of states in intermetallic EuTSi$_3$ (T=Rh, Ir)

Abstract : We report on the physical properties of single crystalline EuRhSi$_3$ and polycrystalline EuIrSi$_3$, inferred from magnetisation, electrical transport, heat capacity and $^{151}$Eu M\"ossbauer spectroscopy. These previously known compounds crystallise in the tetragonal BaNiSn$_3$-type structure. The single crystal magnetisation in EuRhSi$_3$ has a strongly anisotropic behaviour at 2 K with a spin-flop field of 13 T, and we present a model of these magnetic properties which allows the exchange constants to be determined. In both compounds, specific heat shows the presence of a cascade of two close transitions near 50 K, and the $^{151}$Eu M\"ossbauer spectra demonstrate that the intermediate phase has an incommensurate amplitude modulated structure. We find anomalously large values, with respect to other members of the series, for the RKKY N\'eel temperature, for the spin-flop field (13 T), for the spin-wave gap ($\simeq$ 20-25 K) inferred from both resistivity and specific heat data, for the spin-disorder resistivity in EuRhSi$_3$ ($\simeq 35$ $\mu$Ohm.cm) and for the saturated hyperfine field (52 T). We show that all these quantities depend on the electronic density of states at the Fermi level, implying that the latter must be strongly enhanced in these two materials. EuIrSi$_3$ exhibits a giant magnetoresistance ratio, with values exceeding 600 % at 2 K in a field of 14 T.
Document type :
Journal articles
Complete list of metadatas

Cited literature [13 references]  Display  Hide  Download

https://hal-cea.archives-ouvertes.fr/cea-01364335
Contributor : Dominique Girard <>
Submitted on : Monday, September 12, 2016 - 3:08:55 PM
Last modification on : Tuesday, August 11, 2020 - 10:20:04 AM

Links full text

Identifiers

Citation

Arvind Maurya, Pierre Bonville, A. Thamizhavel, S. K. Dhar. Enhanced conduction band density of states in intermetallic EuTSi$_3$ (T=Rh, Ir). Journal of Physics: Condensed Matter, IOP Publishing, 2015, ⟨10.1088/0953-8984/27/36/366001⟩. ⟨cea-01364335⟩

Share

Metrics

Record views

166