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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 Zaum^1,2, Roland Schäfer¹, Peter Schweiss¹, R. E. Baumbach³, M. B. Maple³, and Hilbert von Löhneysen^1,2 — 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).