Exploring high temperature magnetic order in CeTi1-xScxGe

International Conference on Strongly Correlated Electron Systems 2014

Sereni, J.G.^1 ; Pedrazzini, P.^1 ; Berisso, M. Gómez^1 ; Chacoma, A.^1 ; Encina, S.^1 ; Gruner, T.^2 ; Caroca-Canales, N.^2 ; Geibel, C.^2

Low Temperature Division, CAB-CNEA, IB and CONICET, S. C. de Bariloche

8400, Argentina^1

Max-Planck Institute for Chemical Physics of Solids, Dresden

D-01187, Germany^2

关键词: Antiferromagnetic orders;    Critical fields;    High temperature;    Magnetic orders;    Magnetic phase diagrams;    Metamagnetic transitions;    Ordering temperature;    RKKY interactions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/592/1/012005/pdf
DOI  :  10.1088/1742-6596/592/1/012005

来源: IOP

【 摘 要 】

We studied the magnetic, transport, and thermodynamic properties of the alloy CeTi1-xScxGe in order to shed some light into the origin of the exceptionally large antiferromagnetic (AFM) ordering temperature TN=47 K in pure CeScGe. We observed a complex magnetic phase diagram, which present an interesting dichotomy: Despite strong changes in the nature of the ordered state, from ferromagnetic (FM) for x0.55, the ordering temperature increases smoothly and continuously from TC= 7 K at x = 0.25 to TN= 47 K at x = 1. Within the AFM regime we observe a metamagnetic transition at a critical field increasing from H = 0 at x ≈ 0.55 to μ0∗ H ≈ 6 Tesla at x = 1. Furthermore a second transition appears at TL≤ TNfor x ≥ 0.65. In contrast to observations in CeRh2Si2or CeRh3B2, we found no evidence for a strong hybridization of the 4f electrons at large Sc contents. Therefore the exceptionally large TNof CeScGe could be attributed to the unusually strong RKKY interaction in this type of compounds.