Contiguous 3d and 4f Magnetism: Strongly Correlated 3d Electrons in YbFe2Al10

P. Khuntia, P. Peratheepan, A. M. Strydom, Y. Utsumi, K.-T. Ko, K.-D. Tsuei, L. H. Tjeng, F. Steglich, and M. Baenitz
Phys. Rev. Lett. 113, 216403 – Published 19 November 2014
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Abstract

We present magnetization, specific heat, and Al27 NMR investigations on YbFe2Al10 over a wide range in temperature and magnetic field. The magnetic susceptibility at low temperatures is strongly enhanced at weak magnetic fields, accompanied by a ln(T0/T) divergence of the low-T specific heat coefficient in zero field, which indicates a ground state of correlated electrons. From our hard-x-ray photoemission spectroscopy study, the Yb valence at 50 K is evaluated to be 2.38. The system displays valence fluctuating behavior in the low to intermediate temperature range, whereas above 400 K, Yb3+ carries a full and stable moment, and Fe carries a moment of about 3.1μB. The enhanced value of the Sommerfeld-Wilson ratio and the dynamic scaling of the spin-lattice relaxation rate divided by T[(1/T1T)27] with static susceptibility suggests admixed ferromagnetic correlations. (1/T1T)27 simultaneously tracks the valence fluctuations from the 4f Yb ions in the high temperature range and field dependent antiferromagnetic correlations among partially Kondo screened Fe 3d moments at low temperature; the latter evolve out of an Yb 4f admixed conduction band.

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  • Received 19 February 2014

DOI:https://doi.org/10.1103/PhysRevLett.113.216403

© 2014 American Physical Society

Authors & Affiliations

P. Khuntia1,*, P. Peratheepan2,3, A. M. Strydom1,2, Y. Utsumi1, K.-T. Ko4, K.-D. Tsuei5, L. H. Tjeng1, F. Steglich1, and M. Baenitz1

  • 1Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
  • 2Highly Correlated Matter Research Group, Physics Department, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa
  • 3Department of Physics, Eastern University, Vantharumoolai, Chenkalady 30350, Sri Lanka
  • 4Max Planck POSTECH Center for Complex Phase Materials, 01187 Dresden, Germany and Pohang 790-784, Korea
  • 5National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu 30077, Taiwan

  • *pkhuntia@gmail.com

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Issue

Vol. 113, Iss. 21 — 21 November 2014

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