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Regensburg 2002 – scientific programme

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TT: Tiefe Temperaturen

TT 3: Schwere Fermionen, Kondo-Systeme I

TT 3.4: Talk

Monday, March 11, 2002, 10:15–10:30, H18

Gap formation in the semimetal U2Ru2Sn : evidence from 119 Sn NMR investigations — •M. Baenitz1, A. Rabis1, S. Paschen1, V.H. Tran1, N. Senthilkumaran1, F. Steglich1, P. de V. duPlessis2, and A.M. Strydom31MPI für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, D - 01187 Dresden — 2Department of Physics, University of the Witwatersrand PO Wits 250, Johannesburg, South Africa — 3Department of Physics, Rand Afrikaans University, PO 524, Johannesburg, South Africa

We report measurements of the 119Sn nuclear spin - lattice relaxation rate 1/T1 and the Knight shift K for U2Ru2Sn as a function of temperature. The T dependence of 1/T1 is very similar to that of CeNiSn with the only difference that the temperature scale is increased roughly by a factor of 10. Therefore a first estimate gives a gap value of Δ / kB≈ 140 K ( ≈ 14 K for CeNiSn). At low temperatures similar to CeNiSn a T1T=constant behaviour is observed which indicates the presence of residual density of states at the Fermi level N(EF) in the pseudo-gap. Furthermore measurements on the 119Sn Knight shift, the susceptibility, the specific heat, the electrical resistivity and the Hall coefficient are discussed in the context of a gap formation due to correlations in this semimetal. Investigations on the non-magnetic reference compound Th2Ru2Sn are also presented.

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