Low Frequency Spin Dynamics in the CeMIn_5 Materials

Abstract

We measure the spin lattice relaxation of the In(1) nuclei in the CeMIn_5 materials, extract quantitative information about the low energy spin dynamics of the lattice of Ce moments in both CeRhIn_5 and CeCoIn_5, and identify a crossover in the normal state. Above a temperature T* the Ce lattice exhibits "Kondo gas" behavior characterized by local fluctuations of independently screened moments; below T* both systems exhibit a "Kondo liquid" regime in which interactions between the local moments contribute to the spin dynamics. Both the antiferromagnetic and superconducting ground states in these systems emerge from the "Kondo liquid" regime. Our analysis provides strong evidence for quantum criticality in CeCoIn_5.

4 pages, 3 figures

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• Intersite coupling effects in a Kondo lattice
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• Two-Fluid Model for Heavy Electron Physics
• Antiferromagnetism and Superconductivity in Cerium based Heavy Fermion Compounds
• Novel Coexistence of Superconductivity with Two Distinct Magnetic Orders
• The magnitude of the magnetic exchange interaction in the heavy fermion antiferromagnet CeRhIn${}_5$
• Strong-coupling theory of magnetic-exciton-mediated superconductivity in UPd${}_2$Al${}_3$
• Zero-field Quantum Critical Point in CeCoIn${}_5$
• Physical properties and magnetic structure of the intermetallic CeCuBi2 compound
• Spin Susceptibility of Ga-Stabilized delta-Pu Probed by {69}^Ga NMR
• Commensurate Antiferromagnetism in CePt2In7, a Nearly Two-Dimensional Heavy Fermion System
• Hyperfine Interactions in the Heavy Fermion CeMIn_5 Systems
• Heat capacity studies of Ce and Rh site substitution in the heavy fermion antiferromagnet CeRhIn_5;: Short-range magnetic interactions and non-Fermi-liquid behavior
• Low temperature magnetic structure of CeRhIn${}_5$ by neutron diffraction on absorption-optimized samples
• Apparent Violation of the Wiedemann-Franz law near a magnetic field tuned metal-antiferromagnetic quantum critical point
• Crystalline Electric Field Excitations in the Heavy Fermion Superconductor CeCoIn_5
• The nuclear spin-lattice relaxation rate in the PuMGa${}_5$ materials
• Fluctuation and Order of Antiferromagnetism induced by Paramagnetic Pair-Breaking in Superconducting Vortex Lattice
• Tunneling limit of heavy-fermion point contacts
• Tc for heavy Fermion superconductors linked with other physical properties at zero and applied pressure