2014/02/28 by P. Khuntia, P. Peratheepan, A. Strydom +10
Materials Science · Physics and Astronomy · #Antiferromagnetism #Atmospheric temperature range #Condensed matter physics #Ion #Iron-based superconductors research #Magnetic field #Magnetic susceptibility #Magnetization #Materials science #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Rare-earth and actinide compounds #Thermodynamics #Valence (chemistry) #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.113.216403
published as Phys. Rev. Lett. 113, 216403 (2014) · To appear in Phys. Rev. Lett
arxiv created 2014/10/16 · openalex publication_date 2014/11/19 · arxiv updated 2014/11/24 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present magnetization, specific heat, and (27)Al 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, Yb(3+) carries a full and stable moment, and Fe carries a moment of about 3.1 μB. The enhanced value of the Sommerfeld-Wilson ratio and the dynamic scaling of the spin-lattice relaxation rate divided by T[(27)(1/T1T)] with static susceptibility suggests admixed ferromagnetic correlations. (27)(1/T1T) 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.