2017/11/12 by Jiahao Zhang, Hengcan Zhao, Meng Lv +8
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #Electron #Fermi liquid theory #Frustration #Geometrical frustration #Impurity #Iron-based superconductors research #Kondo effect #Lattice (music) #Magnetic susceptibility #Paramagnetism #Phase (matter) #Phase diagram #Phase transition #Physics #Quantum critical point #Quantum mechanics #Quantum phase transition #Quantum spin liquid #Rare-earth and actinide compounds #Spin polarization #Superconductivity #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.97.235117
published as Phys. Rev. B 97, 235117 (2018) · 13 pages, 10 figures
arxiv created 2017/11/12 · openalex publication_date 2018/06/11 · arxiv updated 2018/06/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
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 CePdAl. 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 B0*=B*(T=0)=(4.6\ifmmode±\else\textpm\fi0.1)T, this B*(T) line merges with two other crossover lines, viz. Tp(B) below and TFL(B) above B0*. Tp characterizes a frustration-dominated spin-liquid state, while TFL 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 CePdAl. Our observations reveal a rare case where Kondo coupling, frustration, and quantum criticality are closely intertwined.