Thermodynamic properties of superconductors near magnetic quantum critical point
ORAL
Abstract
I will present the results of the thermodynamic manifestations of the quantum criticality in multiband unconventional superconductors. As a guiding example I will consider the scenario of magnetic quantum critical point in the model that captures superconductivity coexistence with the spin-density wave. I will show that in situations when 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. The theoretical analysis will be corroborated by making a comparison of the results with the recent experimental data from the low-temperature thermodynamic measurements at optimal composition in BaFe$_2$(As$_{1-x}$P$_x$)$_2$
*The work at UW-Madison was financially supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) Program for Materials and Chemistry Research in Quantum Information Science under Award No. DE-SC0020313. M.D. acknowledges financial support from the National Science Foundation grant NSF-DMR-BSF-2002795. M.K. acknowledges financial support from the Israel Science Foundation, Grant No. 2665/20 and in part by the BSF Grant No. 2016317.
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Publication:1. M. Khodas, M. Dzero, and A. Levchenko, ``Anomalous thermodynamic properties of quantum critical superconductors,'' Phys. Rev. B, vol. 102, p. 184505 2. J. Hasan, M. Dzero, M. Khodas, and A.Levchenko, ``Thermodynamic properties of nodal superconductors close to a magnetic quantum critical point,'' Phys. Rev. B, vol. 105, p. 054510, Feb 2022
