Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 78: Correlated Electrons: Poster Session

TT 78.10: Poster

Donnerstag, 10. März 2016, 15:00–18:30, Poster D

Frustrated magnetism in Yb₂Fe₁₂P₇ — •Kai Grube¹, Diego A. Zocco¹, Frank Weber¹, Sebastian Kuntz¹, Ryan Baumbach², James Hamlin³, Ivy Lum⁴, Jeff Lynn⁵, Qingzhen Huang⁵, Marc Janoschek⁶, M. Brian Maple⁴, and Hilbert von Löhneysen¹ — ¹Karlsruhe Institute of Technology, Institut für Festkörperphysik, 76021 Karlsruhe, Germany — ²National High Magnetic Field Laboratory, Tallahassee, USA — ³Departement of Physics, University of Florida, Gainesville, USA — ⁴Department of Physics, University of California, San Diego USA — ⁵NIST Center for Neutron Research, Gaithersburg, USA — ⁶Los Alamos National Laboratory, USA

Yb₂Fe₁₂P₇ is characterized by a low magnetic transition temperature of T_N ≈ 1 K and the breakdown of Fermi-liquid behavior. These properties suggest the proximity to a quantum critical point (QCP). The non-Fermi-liquid (NFL) behavior, however, does not conform to the standard QCP scenario described by the Hertz-Millis-Moriya theory. We measured thermal expansion, magnetostriction and magnetization. The pressure dependence was studied up to 15 GPa using resistivity measurements in piston cylinder and diamond anvil cells. The measurements reveal that only a small fraction of the Yb moments participate in the long-range magnetic order. The Grüneisen ratio does not diverge for T → 0 indicating that the NFL behavior is not related to a nearby pressure-induced QCP. In view of the unusual noncentrometric crystal structure, our observations might point to geometric frustration of the magnetic moments.