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R. Khan, H. Michor, E. Bauer, R. Khasanov, A. Amato, V. Zlatic, I. Aviani, M. Kamal, M. Nicklas, M. Giovannini:
"Re-entrant quantum criticality in pressurized Yb2Pd2Sn and Yb2Pd2In1-xSnx";
Vortrag: ICM 2012 The 19th International Conference on Magnetism with Strongly Correlated Electron Systems (SCES), Bexco, Busan, Korea; 08.07.2012 - 13.07.2012.

Re-entrant quantum criticality in pressurized Yb2Pd2Sn and
Yb2Pd2In1-xSnx
Tahir Rao Khan1, Herwig Michor1, Ernst Bauer1*, Rustem Khasanov2, Alex Amato3, Veljko
Zlatic4, Ivica Aviani4, Mydeen Kamal5, Michael Nicklas5 and Mauro Giovannini6
1 Institute of Solid State Physics, Vienna University of Technology, Austria
2 Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, Switzerland
3 Laboratory for Muon-Spin Spectroscopy, PSI, Paul Scherrer Institute, Switzerland
4 Institute of Physics, Zagreb, Croatia
5 Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
6 Dipartimento di Chimica e Chimica Industriale, University of Genova, Italy
Recently we reported on the discovery of two consecutive, pressure driven magnetic instabilities in Yb2Pd2Sn [1].
They emerge in a non-Fermi liquid environment at the initial and the final point of a dome-like, single magnetic
phase at pressures pc1 ~ 1 GPa and pc2 ~ 4 GPa. This unique behavior of Yb2Pd2Sn is supposed to result from
mutually competing, pressure modified energy scales, which in case of Yb2Pd2Sn cause a sign change in the
pressure dependence of the Kondo temperature TK and magnetic ordering temperature TN. An earlier study [2]
demonstrated the occurrence of long range magnetic order in a dome-like phase space for a narrow concentration
range of Sn-rich samples in Yb2Pd2In1-xSnx. Ordered moments of the order of 1 μB are attained and the transition
temperature reveals values above 3 K, although both Yb2Pd2In and Yb2Pd2Sn exhibit paramagnetic ground states.
The aim of the present work is a detailed study of the pressure and field response of Yb2Pd2Sn and of alloys with
concentrations in the "magnetic dome" of Yb2Pd2In1-xSnx. We show how the transition temperatures and the
ground states modify when applying both pressure and magnetic fields.
[1] T. Muramatsu et al., Phys. Rev. B 83, (2011) 180404(R). [2] E. Bauer et al., J. Phys.: Cond. Mat. 17 (2005) S999.