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Specific Heat and Critical Behavior in BaFe<sub>2</sub>(As<sub>1-x</sub>P<sub>x</sub>)<sub>2</sub>

Invited

Abstract

With Tc’s below 40 K and evidence of a quantum critical point [1], the iron-based high-temperature superconductor BaFe2(As1-xPx)2 is an appealing system for investigating the behavior underlying superconductivity in high-Tc superconductors. By applying magnetic fields up to 35 T, we are able to suppress superconductivity and reveal the normal state of overdoped BaFe2(As1-xPx)2. We observe √H behavior indicating a nodal superconducting gap, saturation of the heat capacity at a magnetic field corresponding to the onset of the normal state, and enhancement of the quasiparticle mass sum as calculated from electronic specific heat coefficient as optimal doping is approached [1]. Our comparison of specific heat as a function of magnetic field to specific heat as a function of temperature, as well as other measurements, forms a consistent treatment of specific heat measurements in high-temperature superconductors.

[1] K. Hashimoto et al. A Sharp Peak of the Zero-Temperature Penetration Depth at Optimal Composition in BaFe2(As1–xPx)2 Science 336, 1554-1557 (2012)
[2] C. M. Moir et al. Multi-band mass enhancement towards critical doping in a pnictide superconductor npj Quantum Materials 4, 8 (2019)

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Presenters

  • Camilla Moir

    University of California, San Diego, Physics, University of California San Diego

Authors

  • Camilla Moir

    University of California, San Diego, Physics, University of California San Diego

  • Scott C. Riggs

    NHMFL

  • Jose A Galvis

    NHMFL

  • Paula Giraldo-Gallo

    Departamento de Física, Universidad de los Andes, University of Los Andes, UNIVERSIDAD DE LOS ANDES, Universidad de los Andes

  • Jiun-Haw Chu

    University of Washington, Department of Physics, University of Washington, Seattle, Department of Physics, University of Washington, Physics, University of Washington

  • Philip Walmsley

    Stanford University

  • Ian R Fisher

    Geballe Laboratory for Advanced Materials, Stanford University, Stanford Univ, Stanford University, Department of Applied Physics, Stanford University

  • Arkady Shekhter

    NHMFL, National High Magnetic Field Lab

  • Greg Scott Boebinger

    NHMFL