Local character of the highest antiferromagnetic temperature of Ce systems in Sc-rich CeTi1xScxGe

J. G. Sereni, P. Pedrazzini, M. Gómez Berisso, A. Chacoma, S. Encina, T. Gruner, N. Caroca-Canales, and C. Geibel
Phys. Rev. B 91, 174408 – Published 7 May 2015

Abstract

The highest antiferromagnetic (AFM) temperature in Ce based compounds has been reported for CeScGe with TN=47K, but its local or itinerant nature has not been deeply investigated yet. In order to shed more light into this unusually high ordering temperature we have investigated structural, magnetic, transport, and thermal properties of CeTi1xScxGe alloys within the range of stability of the CeScSi-type structure: 0.25x1. Along this concentration range, this strongly anisotropic system presents a complex magnetic phase diagram with a continuous modification of its magnetic behavior, from ferromagnetism for 0.25x0.50 (with 7KTC16K) to AFM for 0.60x1 (with 19KTN47K). The onset of the AFM phase is associated to a metamagnetic transition with a critical field increasing from Hcr=0 at x0.55 to 6T at x=1, coincident with an increasing contribution of the first excited crystal electric field doublet. At a critical point xcr0.65 a second transition appears at TLTN. In contrast to observations in itinerant systems like CeRh2Si2 or CeRh3B2, no evidences for significant hybridization of the 4f electrons at large Sc contents were found. Therefore, the exceptionally large TN of CeScGe can be attributed to an increasing Ruderman-Kittel-Kasuya-Yosida interaction between Ce double layers as Sc content grows.

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  • Received 13 February 2015
  • Revised 21 April 2015

DOI:https://doi.org/10.1103/PhysRevB.91.174408

©2015 American Physical Society

Authors & Affiliations

J. G. Sereni, P. Pedrazzini, M. Gómez Berisso, A. Chacoma, and S. Encina

  • Low Temperature Division, CAB-CNEA and Instituto Balseiro, 8400 San Carlos de Bariloche, Argentina

T. Gruner, N. Caroca-Canales, and C. Geibel

  • Max-Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany

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Issue

Vol. 91, Iss. 17 — 1 May 2015

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