Superconductivity in Y3Ru4Ge13 and Lu3Os4Ge13: A comparative study

27th International Conference on Low Temperature Physics

Prakash, Om^1 ; Thamizhavel, A.^1 ; Ramakrishnan, S.^1

Department of Condensed Matter Physics and Material Science, Tata Institute of Fundamental Research, Mumbai

400005, India^1

关键词: Bardeen-Cooper-Schrieffer theory;    Crystal pulling method;    Experimental techniques;    Heat capacity measurements;    Low carrier density;    Low-carrier-density system;    Superconducting transitions;    Unconventional superconductors;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/568/2/022039/pdf
DOI  :  10.1088/1742-6596/568/2/022039

来源: IOP

【 摘 要 】

A variety of unconventional superconductors have low carrier density as a common factor. However, The underlying mechanism of superconductivity in such low carrier density systems is not well understood. Besides, small carrier density is an unfavourable component for conventional superconductivity as described by The Bardeen-Cooper-Schrieffer (BCS) theory. Therefore, studying low carrier density systems can lead to a better understanding in such systems. In this paper, we report superconductivity property studies in low carrier density systems, Y3Ru4Ge13and Lu3Os4Ge13, using various experimental techniques. Single crystals of Y3Ru4Ge13and Lu3Os4Ge13have been grown using The Czochralski crystal pulling method in a tetra-arc furnace. The x-ray diffraction experiment reveals that both compounds crystallize in cubic structure (space group Pm3n, no. 223). The transport, magnetization and heat capacity measurements show that Y3Ru4Ge13single crystal undergoes a superconducting transition at 2.85 K, whereas, Lu3Os4Ge13becomes superconductor at 3.1 K.