Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 5: Frustrated Magnets - General 1 (joint session TT/MA)

TT 5.1: Vortrag

Montag, 16. März 2020, 09:30–09:45, HSZ 304

Pressure tuning of the ground state of a frustrated Kondo lattice investigated by Muon Spin Relaxation / Rotation spectroscopy — •Mayukh Majumder1, Ritu Gupta2, Philipp Gegenwart1, Oliver Stockert3, and Veronika Fritsch11Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany — 2Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland — 3Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany

Formation of novel quantum states driven by magnetic frustration are of strong current interest. For metallic Kondo lattices tuned to a quantum critical point (QCP), strong frustration is predicted to cause a severe breakdown of Fermi liquid behavior and a possible metallic spin liquid state. CePdAl is a prototype frustrated Kondo lattice with incommensurate long-range magnetic order (LRO) at about 2.7 K involving only 2/3-rd of the 4f moments. The LRO can be suppressed by hydrostatic pressure exceeding 1 GPa [1] and an extended non-Fermi liquid ground state has been observed up to a pressure of about 1.7 GPa [2]. We have employed Muon Spin Relaxation / Rotation (µSR) at milli-Kelvin temperatures and pressures up to 1.62 GPa as a local technique to determine the nature of the magnetic moments across the quantum critical point in CePdAl.

[1] H. Kitazawa et al. Phys. B, 28, 199 (1994)

[2] Zhao et al. Nature Phys. 10.1038/s41567-019-0666-6 (2019)

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