Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 44: Poster Session Correlated Electrons
TT 44.31: Poster
Donnerstag, 17. März 2011, 10:00–13:00, P1
Thermal expansion and magnetostriction of Yb2Fe12P7 single crystals — •Kai Grube1, Sebastian Zaum1,2, Roland Schäfer1, Peter Schweiss1, R. E. Baumbach3, M. B. Maple3, and Hilbert von Löhneysen1,2 — 1Karlsruher Institut für Technologie, Institut für Festkörperphysik, 76021 Karlsruhe, Germany — 2Karlsruher Institut für Technologie, Physikalisches Institut, 76128 Karlsruhe, Germany — 3Department of Physics, University of California, San Diego, La Jolla, California 92093, USA
The noncentrosymmetric heavy-fermion compound Yb2Fe12P7 exhibits a magnetic transition at ≈ 1 K. Recent resistivity measurements [1] reveal non-Fermi-liquid behavior in an extended temperature and field range. From the unusual low-temperature behavior it was concluded that Yb2Fe12P7 belongs to the growing class of compounds in which the non-Fermi-liquid behavior does not conform to the standard QCP scenario which can be described by the Hertz-Millis-Moriya theory. We report on thermal expansion and magnetostriction measurements in a temperature range of 40 mK < T < 10 K and magnetic fields of up to 14 T parallel and perpendicular to the hexagonal c axis. From the data we construct (T, B) phase diagrams for both field directions. The Grüneisen ratio calculated from our measurements is comparatively small and does not diverge for T→ 0. It gives, therefore, no evidence for a nearby pressure-induced quantum critical point.
R. E. Baumbach et al., Phys. Rev. Lett. 105, 106403 (2010).