Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 56: Correlated Electrons: Quantum-Critical Phenomena

TT 56.5: Vortrag

Donnerstag, 19. März 2020, 10:30–10:45, HSZ 304

Non-Fermi liquid behaviors in Y1−xPrxIr2Zn20 studied by thermal expansion — •Andreas Wörl1, Yu Yamane2, Yoshifumi Tokiwa1, Takahiro Onimaru2, and Philipp Gegenwart11Experimental Physics 6, Center for Electronic Correlations and Magnetism, University of Augsburg, Germany — 2Graduate School of Advanced Sciences of Matter, Department of Quantum Matter, Hiroshima University, Japan

The overscreening of quadrupole moments by two-channels of conduction electrons, generally known as two-channel Kondo effect, causes non-Fermi liquid behavior. A prototype material to study this effect is the quadrupole Kondo lattice PrIr2Zn20 [1]. Y substituted PrIr2Zn20 single crystals exhibit non-Fermi liquid behaviors in specific heat [2], electrical resistivity [2] and elastic constants [3], which are compatible with the theoretical single-site two channel Kondo model. In this talk, we present results on the thermal expansion and magnetostriction of Y1−xPrxIr2Zn20 single crystals which allow for a further characterization of this novel hybridization effect.

[1] T. Onimaru et al., Phys. Rev. B 94, 075134 (2016)

[2] Y. Yamane et al., Phys. Rev. Lett. 121, 077206 (2018)

[3] T. Yanagisawa et al., Phys. Rev. Lett. 123, 067201 (2019)

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