Challenging Magnetic Field Dependence of the Residual Resistivity of the Heavy-Fermion Metal CeCoIn5

Abstract

An explanation of paradoxical behavior of the residual resistivity rho_0 of the heavy-fermion metal CeCoIn5 in magnetic fields and under pressure is developed. The source of this behavior is identified as a flattening of the single-particle spectrum, which exerts profound effects on the specific heat, thermal expansion coefficient, and magnetic susceptibility in the normal state, the specific heat jump at the point of superconducting phase transition, and other properties of strongly correlated electron systems in solids. It is shown that application of a magnetic field or pressure to a system possessing a flat band leads to a strong suppression of rho_0. Analysis of its measured thermodynamic and transport properties yields direct evidence for the presence of a flat band in CeCoIn5.

5 pages, 3 figures, references added, minor corrections made

References in corpus (10)

• Fermi-liquid instabilities at magnetic quantum phase transitions
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• Visualizing heavy fermions emerging in a quantum critical Kondo lattice
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• Nonvanishing Energy Scales at the Quantum Critical Point of CeCoIn5
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• Towards the identification of a quantum critical line in the (p, B) phase diagram of CeCoIn5
• Curie law, entropy excess, and superconductivity in heavy fermion metals and other strongly interacting Fermi liquids
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Cited by in corpus (8)

• Occurrence of flat bands in strongly correlated Fermi systems and high-$T_c$ superconductivity of electron-doped compounds
• Topological disorder triggered by interaction-induced flattening of electron spectra in solids
• Nature of the quantum critical point as disclosed by extraordinary behavior of magnetotransport and the Lorentz number in the heavy-fermion metal YbRh2Si2
• Common behavior of the scaled condensation energy for both high-$T_c$ and conventional superconductors
• Transport properties of strongly correlated Fermi systems
• Scaling behavior of superconductors
• Quantum Phase Transition in $\mathrm{CeCoI}{\mathrm{n}}_5$: Experimental Facts and Theory
• A unified quasiparticle approach to the theory of strongly correlated electron liquids