Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 44: Poster Session Correlated Electrons

TT 44.27: Poster

Thursday, March 17, 2011, 10:00–13:00, P1

Structural and magnetic transitions in YbPd — •Stefanie Grünheit¹, Hirale S. Jeevan¹, Devashibhai T. Adroja², Yoshifumi Tokiwa¹, Christian Stingl¹, Aziz Daoud-Aladine², and Philipp Gegenwart¹ — ¹1. Physikalisches Institut, Georg-August-Universität Göttingen — ²ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OXII, 0QX, United Kingdom

The cubic YbPd is a unique strongly-correlated electron system which shows structural and magnetic transitions upon cooling to low temperatures [1]. However, the nature of the magnetic and the atomic structure at low T has not been solved yet. We synthesized YbPd polycrystals and investigated their physical properties by electrical resistivity, magnetic susceptibility, specific heat and thermal expansion measurements. Furthermore, neutron scattering experiments were performed down to 20 mK in order to obtain microscopic information on the different phase transitions. At low temperatures, the Sommerfeld coefficient of YbPd is of the order of 200 mJ/(mol K²) suggesting that YbPd is a moderately heavy fermion system. A reduced entropy of about one quarter of Rlog2 at 1.9 K is found. Remarkably this value is consistent with a structure with only half of the Yb-Ions contributing to the magnetic entropy.

Work supported by DFG through research unit 960 (Quantum phase transitions).
P. Bonville et al., Phys. Rev. Lett. 57 (1986) 2733.