Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 78: Correlated Electrons: Poster Session
TT 78.13: Poster
Donnerstag, 10. März 2016, 15:00–18:30, Poster D
Thermal Expansion and Magnetostriction Measurements on PrIr2Zn20 — •Andreas Wörl1, Christian Stingl1, Akito Sakai1, Keisuke T. Matsumoto2, Takahiro Onimaru2, Toshiro Takabatake2,3, and Philipp Gegenwart1 — 1Experimentalphysics VI, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany — 2Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima 739-8530, Japan — 3Institute for Advanced Materials Research, Hiroshima University, Higashi-Hiroshima 739-8530, Japan
Strong hybridization between electric quadrupole moments and conduction electrons gives rise to interesting physical phenomena such as new quantum phases and novel metallic properties. Non-fermi-liquid behavior based on the two channel Kondo effect is predicted by theory. PrIr2Zn20 crystallizes in the CeCr2 Al20-type structure, where the Pr3+ ions are surrounded by the highly symmetric cubic crystal field of 16 Zn atoms. The ground state is the non-magnetic Γ3 doublet and carries only electric quadrupole and a magnetic octupole moment. At TQ=0.11 K the electric quadrupole moments order in a antiferroquadrupolar way. A superconducting transition occurs at Tc=0.05 K. The phase transition at TQ=0.11 K can be suppressed by high magnetic fields parallel to the [100] direction. We investigate the thermal expansion and magnetostriction at low temperatures. By applying high magnetic fields the system is tuned towards a quadrupolar quantum critical point. Furthermore the reaction of the system on breaking the cubic symmetry by compressive stress is explored.