Signature of CEF-phonon coupling in Kondo lattice system CeCuGa3. Issue 1 (1st March 2022)

• Record Type: Journal Article
• Authors: Anand, V K; Fraile, A; Adroja, D T; Sharma, Shivani; Tripathi, Rajesh; Ritter, C; de la Fuente, C; Biswas, P K; Garcia Sakai, V; del Moral, A; Strydom, A M
• Is Part Of: Journal of physics. Volume 2164:Issue 1(2022)
• Publication Date: 2022-03-01
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/2164/1/012056
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: We present the results of inelastic neutron scattering (INS) measurements on Kondo lattice heavy fermion CeCuGa3 . The low-temperature magnetic susceptibility exhibits an anomaly near 2.6 K associated with an antiferromagnetic transition which is further confirmed by the heat capacity measurement. The analysis of magnetic heat capacity C mag ( T ) based on the crystal electric field (CEF) model reveals an overall CEF splitting of ∼ 21 meV. The INS data reveal two strong magnetic excitations near 4.5 and 6.9 meV, which, however failed to reproduce the observed C mag ( T ). We therefore analyze the INS data by a model based on magneto-elastic (i.e. CEF-phonon) coupling which suggests that the excitations observed near 4.5 and 6.9 meV originate from the CEF-phonon coupling as observed in CeCuAl3 and CeAuAl3 .