Quantum Critical Behavior and Superconductivity in new multi-site Cerium Heavy Fermion Compound Ce3PtIn11

TMU International Symposium on "New Quantum Phases Emerging from Novel Crystal Structure"

Custers, J.^1 ; Divii, M.^1 ; Kratochvílová, M.^1

Charles University in Prague, Faculty of Mathematics and Physics, Ke Karlovu 5, Prague 2

121 16, Czech Republic^1

关键词: Antiferromagnetic state;    Critical pressures;    Heavy fermion compounds;    P-T phase diagram;    Pressure dependence;    Quantum critical behavior;    Quantum critical points;    Transport measurements;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/683/1/012005/pdf
DOI  :  10.1088/1742-6596/683/1/012005

来源: IOP

【 摘 要 】

We discuss the results of thermodynamic and transport measurements at ambient and under hydrostatic pressure of the recently discovered heavy fermion superconductor Ce3PtIn11. At p = 0 superconductivity emerges in the complex antiferromagnetic state below Tc= 0.32 K. Both phenomena coexist in a wide range of the p - T phase diagram. The critical pressure where TN→ 0 and Tcis maximum equals pc= 1.3 GPa. Here, the resistivity follows ρ(T) α Tnwith n = 0.90±0.05 suggesting a local moment-type of quantum critical point. The presence of a maximum structure in the susceptibility and the unusual pressure dependence of Tchint to an understanding of properties of Ce3PtIn11in the view of distinct different Kondo screened sublattices. Therefore, we analyze the magnetic entropy Smagwithin the spin-1/2 Kondo model while accounting for the fact that Ce3PtIn11unit cell possesses two inequivalent Ce-sites, Ce1 and Ce2. We employ an extreme case scenario of non-interacting sublattices where the Ce1-sublattice is paramagnetic and only Ce2-sublattice orders magnetically and discussed its consequences.