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115In NQR Study With Evidence For Two Magnetic Quantum Critical Points In Dual Ce Site Superconductor Ce3PtIn11

115In NQR study with evidence for two magnetic quantum critical points in dual Ce site superconductor Ce3PtIn11

Authors: Kambe, H. Sakai, Y. Tokunaga, R.E. Walstedt, M. Kratochvílová, K. Uhlířová, J. Custers

Phys. Rev. B 101 (2020) 081103(R).

Abstract:  115In nuclear quadrupole resonance (NQR) measurements have been carried out on Ce3PtIn11, a heavy fermion compound harboring two inequivalent Ce sites. This system exhibits magnetic transitions at T1n=2.2 K and TN=2 K, prior to entering a superconducting state below Tc=0.32 K. Previous measurements imply that magnetism and superconductivity are spatially separated and only the Ce(2) sublattice orders magnetically, with a quantum critical point at pressure pc=1.3 GPa, while the Ce(1) sublattice is paramagnetic. However, the present nuclear relaxation rate behavior of 1/T1T reveals the presence of critical spin fluctuations indicative of close proximity to another quantum critical point, presumably at a small negative pressure, which is associated solely with the Ce(1) sublattice. The ordered wave vector is found to be most likely (1/2,1/2,h).



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