Thermodynamic properties of nodal superconductors close to a magnetic quantum critical point

Abstract

In this work we study thermodynamic manifestations of the quantum criticality in multiband unconventional superconductors. As a guiding example we consider the scenario of magnetic quantum critical point in the model that captures superconductivity coexistence with the spin-density wave. We show that in situations when the superconducting order parameter has incidental nodes at isolated points, quantum magnetic fluctuations lead to the renormalization of the relative $T$-linear slope of the London penetration depth. This leads to the nonmonotonic dependence of the penetration depth as a function of doping and the concomitant peak structure across the quantum critical point. In addition, we determine contribution of magnetic fluctuations to the specific heat at the onset of the coexistence phase. Our theoretical analysis is corroborated by making a comparison of our results with the recent experimental data from the low-temperature thermodynamic measurements at optimal composition in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$.

arXiv comment6 pages, 2 figures

References in corpus (33)

• A Common Thread: the pairing interaction for the unconventional superconductors
• Gap symmetry and structure of Fe-based superconductors
• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• Quantum critical point lying beneath the superconducting dome in iron-pnictides
• The remarkable underlying ground states of cuprate superconductors
• A Sharp Peak of the Zero-Temperature Penetration Depth at Optimal Composition in BaFe2(As1-xPx)2
• Universal $T$-linear resistivity and Planckian limit in overdoped cuprates
• Competing order and nature of the pairing state in the iron pnictides
• London Penetration Depth in Iron - based Superconductors
• Scale-invariant magnetoresistance in a cuprate superconductor
• Magnetoresistance near a quantum critical point
• Superconductivity and spin-density-waves in multi-band metals
• Heavy-electron quantum criticality and single-particle spectroscopy
• Momentum dependence and nodes of the superconducting gap in iron-pnictides
• Origin of Gap Anisotropy in Spin Fluctuation Models of the Fe-pnictides
• Doping evolution of superconducting gaps and electronic densities of states in Ba(Fe1-xCox)2As2 iron pnictides
• Quasiparticle mass enhancement close to the quantum critical point in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Emerging superconductivity with broken time reversal symmetry inside a superconducting $s$-wave state
• Enhancement of the London penetration depth in pnictides at the onset of SDW order under superconducting dome
• Anomalous critical fields in quantum critical superconductors
• Singularity of the London penetration depth at quantum critical points in superconductors
• Local characterization of superconductivity in BaFe2(As1-xPx)2
• Ultrasound attenuation in gap-anisotropic systems
• Anomalous superfluid density in quantum critical superconductors
• Effect of magnetic criticality and Fermi-surface topology on the magnetic penetration depth
• Quantum phase transition inside the superconducting dome of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ probed by optical magneto-sensing using NV-centers in diamond
• Phase transition beneath the superconducting dome in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Magnetic penetration depth in disordered iron-based superconductors
• Thermodynamic signatures of an antiferromagnetic quantum critical point inside a superconducting dome
• Effect of SDW fluctuations on the specific heat jump in iron pnictides at a superconducting transition
• Anomalous thermodynamic properties of quantum critical superconductors
• Inhomogeneous magnetic multiband superconductors
• Anomalous sharp peak in the London penetration depth induced by the nodeless-to-nodal superconducting transition in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$

Cited by in corpus (3)

• Robust superconductivity and the suppression of charge-density wave in ${\text{Ca}}_3({\text{Ir}}_{1-x}{\text{Rh}}_x{)}_4{\text{Sn}}_{13}$ single crystals at ambient pressure
• Transport anomalies in multiband superconductors near quantum critical point
• Impurity bands in magnetic superconductors with spin density wave