Antiferromagnetic exchange weakening in the TbRhIn5 intermetallic system with Y-substitution. (July 2018)

• Record Type: Journal Article
• Authors: Amaral, R.P.; Lora-Serrano, R.; Garcia, D.J.; Iwamoto, W.A.; Betancourth, D.; Cadogan, J.M.; Muñoz-Pérez, S.; Avdeev, M.; Cobas-Acosta, R.; Bittar, E.M.; Duque, J.G.S.; Pagliuso, P.G.
• Is Part Of: Intermetallics. Volume 98(2018:Jul.)
• Page Start: 161
• Page End: 168
• Publication Date: 2018-07
• Subjects: Magnetic properties -- Thermodynamic properties -- Physical properties -- Neutron diffraction; Intermetallic compounds -- Metallography -- Periodicals; Metallic glasses -- Periodicals; Composés intermétalliques -- Métallographie -- Périodiques; 669.94
• DOI: 10.1016/j.intermet.2018.04.016
• Languages: English
• ISSNs: 0966-9795

Abstract

Abstract: We report measurements of the temperature dependent specific heat and magnetic susceptibility in single crystals of the series of intermetallic compounds Tb1 − x Y x RhIn5 (nominal concentrations x = 0.0, 0.15, 0.3, 0.4, 0.5, 0.7). A mean field approximation to simulate the macroscopic properties along the series has been used. Neutron diffraction data in powdered samples of Tb0 . 6 Y0 . 4 RhIn5 and Tb0 . 6 La0 . 4 RhIn5 reveal antiferromagnetic (AFM) propagation vector k → = [ 1 2 0 1 2 ] with the magnetic moments oriented along the tetragonal c axis or canted from this axis, respectively for Y and La-substitutions. Considering both the simulations of the magnetic exchange and neutron diffraction data, we discuss the role of combined effects of crystalline electric field (CEF) perturbations and dilution in the evolution of magnetic properties with Y and La contents. In particular, we found negligible variations of the B n m parameters along the Y series. The decrease of T N with x is fully dominated by magnetic dilution effects. Highlights: We discuss the magnetic properties of the antiferromagnetic Tb1−xYxRhIn5 (x = 0.15, 0.3, 0.4, 0.5 and 0.7) compounds. The Néel temperature (TN) decreases with x and this is mostly determined by the weakening of the Tb-Tb magnetic exchange. The crystalline electric field (CEF) has negligible contribution to the behaviour of TN. The antiferromagnetic propagation vector of both Tb0.6Y0.4RhIn5 and Tb0.6La0.4RhIn5 is the same as for x = 0 [0.5 0 0.5]. The magnetic moments are along the tetragonal c-axis for Tb-Y, while it is canted from c in Tb-La (because of CEF effects).