Title: Crystal Fields, Disorder and Antiferromagnetic Short-Range Order in Yb0.24Sn0.76Ru
Authors: KLIMCZUK TOMASZWANG C. H.LAWRENCE J.XU Q.DURAKIEWICZ T.RONNING F.A. LlobetTROUW F.KURITA N.TOKIWA Y.LEE Han-OhBOOTH C. H.GARDNER J.s.BAUER E.d.JOYCE J.j.ZANDBERGEN H.w.MOVSHOVICH RCAVA R.j.THOMPSON J.d.
Citation: PHYSICAL REVIEW B vol. 84 no. 7 p. 075152
Publisher: AMER PHYSICAL SOC
Publication Year: 2011
JRC N°: JRC64531
ISSN: 1098-0121
URI: http://prb.aps.org/abstract/PRB/v84/i7/e075152
http://publications.jrc.ec.europa.eu/repository/handle/JRC64531
DOI: 10.1103/PhysRevB.84.075152
Type: Articles in Journals
Abstract: We report extensive measurements on a new compound (Yb0.24Ru0.76)Sn that crystallizes in the cubic CsCl structure. Valence band photoemission (PES) and L3 x-ray absorption show no divalent component in the 4f configuration of Yb. Inelastic neutron scattering (INS) indicates that the eight-fold degenerate J-multiplet of Yb3+ is split by the crystalline electric field (CEF) into a Γ7 doublet ground state and a 8 quartet at an excitation energy 20 meV. The magnetic susceptibility can be fit very well by this CEF scheme under the assumption that a Γ6 excited state resides at 32 meV; however, the Γ8/Γ6 transition expected at 12 meV was not observed in the INS. The resistivity follows a Bloch-Grüneisen law shunted by a parallel resistor, as is typical of systems subject to phonon scattering with no apparent magnetic scattering. All of these properties can be understood as representing simple local moment behavior of the trivalent Yb ion. At 1 K, there is a peak in specific heat that is too broad to represent a magnetic phase transition, consistent with absence of magnetic reflections in neutron diffraction. On the other hand, this peak also is too narrow to represent the Kondo effect in the Γ7 -doublet ground state. On the basis of the field-dependence of the specific heat, we argue that antiferromagnetic (AF) short-range order (SRO) (possibly co-existing with Kondo physics) occurs at low temperatures. The long-range magnetic order is suppressed because the Yb site occupancy is below the percolation threshold for this disordered compound.
JRC Institute:Institute for Transuranium Elements

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