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

IF 4.7 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Advances Pub Date : 2025-01-31 DOI:10.1039/D5MA00022J

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 and Tyrel M. McQueen

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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.

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准二维狄拉克金属中的I型和II型超导性

研究了用自通量法制备的Dirac材料LaCuSb2单晶中的体超导相。磁化、μ子自旋弛豫测量和密度泛函理论表明，狄拉克节点线费米表面对沿a轴施加的磁场产生ii型超导，对沿c轴施加的磁场产生i型超导。化学压力和静水压力都极大地抑制了超导转变。我们发现T* <的电子比热容和高压磁化率急剧下降证明了多带超导性；Tc / 3。我们的工作证明了LaCuSb2中的脏极限、弱耦合多带超导性，并强调了狄拉克费米子对其各向异性特性的作用。

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