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Journal Article

Kondo destruction in a quantum paramagnet with magnetic frustration


Steglich,  Frank
Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Zhang, J., Zhao, H., Lv, M., Hu, S., Isikawa, Y., Yang, Y.-f., et al. (2018). Kondo destruction in a quantum paramagnet with magnetic frustration. Physical Review B, 97(23): 235117, pp. 1-6. doi:10.1103/PhysRevB.97.235117.

Cite as: http://hdl.handle.net/21.11116/0000-0001-9405-2
We report results of isothermal magnetotransport and susceptibility measurements at elevated magnetic fields B down to very low temperatures T on single crystals of the frustrated Kondo-lattice system CePdA1. They reveal a B* (T) line within the paramagnetic part of the phase diagram. This line denotes a thermally broadened "small"-to-"large" Fermi-surface crossover which substantially narrows upon cooling. At B-0* = B*(T = 0) = (4.6 +/- 0.1)T, this B* (T) line merges with two other crossover lines, viz. T-p (B) below and T FL (B) above B-0*. T-p characterizes a frustration-dominated spin-liquid state, while T-FL is the Fermi-liquid temperature associated with the lattice Kondo effect. Non-Fermi-liquid phenomena which are commonly observed near a "Kondo-destruction" quantum-critical point cannot be resolved in CePdA1. Our observations reveal a rare case where Kondo coupling, frustration, and quantum criticality are closely intertwined.