Type I and type II superconductivity in a quasi-2D Dirac metal

Chris J. Lygouras; Junyi Zhang; Jonah Gautreau; Mathew Pula; Sudarshan Sharma; Shiyuan Gao; Tanya Berry; Thomas Halloran; Peter Orban; Gael Grissonnanche; Juan R. Chamorro; Taketora Mikuri; Dilip K. Bhoi; Maxime A. Siegler; Kenneth J.T. Livi; Yoshiya Uwatoko; Satoru Nakatsuji; B. J. Ramshaw; Yi Li; Graeme M. Luke; Collin L. Broholm; Tyrel M. McQueen

doi:10.1039/D5MA00022J

Type I and type II superconductivity in a quasi-2D Dirac metal†

Chris J. Lygouras,

*^a Junyi Zhang,

^a Jonah Gautreau,^b Mathew Pula,^b Sudarshan Sharma,

^b Shiyuan Gao,^ac Tanya Berry,

^ac Thomas Halloran,^a Peter Orban,^a Gael Grissonnanche,^de Juan R. Chamorro,^ac Taketora Mikuri,^f Dilip K. Bhoi,^f Maxime A. Siegler,^c Kenneth J.T. Livi,^m Yoshiya Uwatoko,^f Satoru Nakatsuji,^afghij B. J. Ramshaw,^dj Yi Li,^a Graeme M. Luke,

^bk Collin L. Broholm^alm and Tyrel M. McQueen

^acm

Author affiliations

* Corresponding authors

^a Institute for Quantum Matter and William H. Miller III Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
E-mail: clygour1@jhu.edu

^b Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada

^c Department of Chemistry, Johns Hopkins University, Baltimore, Maryland, USA

^d Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY, USA

^e Kavli Institute at Cornell for Nanoscale Science, Ithaca, NY, USA

^f Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, Chiba, Japan

^g Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan

^h Trans-scale Quantum Science Institute, University of Tokyo, Bunkyo-ku, Tokyo 113-8654, Japan

ⁱ CREST, Japan Science and Technology Agency (JST), 4-1-8 Honcho Kawaguchi, Saitama, Japan

^j Canadian Institute for Advanced Research, Toronto, ON, Canada

^k TRIUMF, Vancouver, British Columbia, Canada

^l NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland, USA

^m Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland, USA

Abstract

We explore bulk superconducting phase in single crystals of the Dirac material LaCuSb₂ prepared by the self-flux method. Magnetization, muon spin relaxation measurements, and density functional theory, show the Dirac nodal line Fermi surfaces give rise to type-II superconductivity for magnetic fields applied along the a-axis, and type-I superconductivity for fields along the c-axis. Both chemical and hydrostatic pressure drastically suppress the superconducting transition. We find multiband superconductivity evidenced by a precipitous drop in the electronic specific heat capacity and high-pressure susceptibility for T* < T_c/3. Our work demonstrates dirty-limit, weak-coupling multiband superconductivity in LaCuSb₂, and highlights the role of Dirac fermions on its anisotropic character.

This article is part of the themed collection: In Honor of Professor Thom Palstra

Materials Advances

Type I and type II superconductivity in a quasi-2D Dirac metal†

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Type I and type II superconductivity in a quasi-2D Dirac metal

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