Pressure studies of the quantum critical alloy Ce(0.93)Yb(0.07)CoIn5
arXiv:1411.2524 · doi:10.1103/PhysRevB.91.174506
Abstract
Here we present our experimental and theoretical study of the effects of pressure on the transport properties of the heavy-fermion alloy Ce(1-x)Yb(x)CoIn5 with x~0.07. We specifically choose this value of ytterbium concentration because the magnetic-field-induced quantum critical point, which separates the antiferromagnetic and paramagnetic states at zero temperature, approaches zero, as has been established in previous studies. Our measurements show that pressure further suppresses quantum fluctuations in this alloy, just as it does in the parent compound CeCoIn5. In contrast, the square-root temperature dependent part of resistivity remains insensitive to pressure, indicating that the heavy-quasiparticles are not involved in the scattering processes leading to such a temperature dependent resistivity. We demonstrate that the growth of the coherence temperature with pressure, as well as the decrease of the residual resistivity, can be accurately described by employing the coherent potential approximation for a disordered Kondo lattice.
arXiv comment11 pages, 8 figures
References in corpus (22)
- Topological Insulators
- Topological insulators and superconductors
- Topological Kondo Insulators
- Heavy-fermion superconductivity in CeCoIn5 at 2.3K
- Low-temperature surface conduction in the Kondo insulator SmB
- Topological surface state in the Kondo Insulator Samarium Hexaboride
- Robust Surface Hall Effect and Nonlocal Transport in SmB6: Indication for an Ideal Topological Insulator
- Hybridization, Inter-Ion Correlation, and Surface States in the Kondo Insulator SmB6
- Andreev Reflection in Heavy-Fermion Superconductors and Order Parameter Symmetry in CeCoIn_5
- Unpaired Electrons in the Heavy-Fermion Superconductor CeCoIn_{5}
- Incoherent non-Fermi liquid scattering in a Kondo lattice
- Field Dependent Coherence Length in the Superclean, High-Kappa Superconductor CeCoIn5
- Evolution of the superconducting energy gap structure concomitant with Fermi surface reconstruction in the heavy-fermion superconductor CeCoIn5
- Strong magnetic fluctuations in superconducting state of CeCoIn
- Andreev reflection and order parameter symmetry in heavy-fermion superconductors: the case of CeCoIn
- Non-Fermi liquid behavior with and without quantum criticality in Ce(1-x)Yb(x)CoIn(5)
- Yb Valence Change in (Ce,Yb)CoIn5 from spectroscopy and bulk properties
- Gapless Fermi Surfaces in Superconducting CeCoIn5?
- Molecular Pairing and Fully-Gapped Superconductivity in Yb doped CeCoIn5
- Resolution of the discrepancy between the variation of the physical properties of Ce1-xYbxCoIn5 single crystals and thin films with Yb composition
- From local moment to mixed-valence regime in Ce(1-x)Yb(x)CoIn5 alloys
- Theory for effects of pressure on heavy-fermion alloys