標題: Investigation of normal and superconducting states in noncentrosymmetric Re24Ti5
作者: Lue, C. S.
Liu, H. F.
Kuo, C. N.
Shih, P. S.
Lin, J-Y
Kuo, Y. K.
Chu, M. W.
Hung, T-L
Chen, Y. Y.
物理研究所
Institute of Physics
公開日期: 1-May-2013
摘要: We report a detailed characterization of the noncentrosymmetric superconductor Re24Ti5 using powder x-ray diffraction (XRD), magnetic susceptibility, electrical resistivity, thermal conductivity, Seebeck coefficient, and specific heat measurements. Rietveld refinement of powder XRD data confirms that Re24Ti5 crystallizes in the alpha-Mn structure. All measured quantities demonstrate a bulk superconducting transition at T-c = 5.8 K. Our low-temperature specific heat data measured down to 0.5 K yield a Sommerfeld coefficient gamma = 111.8 mJ mol(-1) K-2, which implies a high density of states at the Fermi level. Moreover, the electronic specific heat in the superconducting state was found to obey a typical s-wave expression, revealing a single gap Delta/k(B) = 10.6 K. This value gives a ratio of 2D/k(B)T(c) = 3.68, higher than the value of 3.5 predicted from BCS theory. On this basis, we conclude that the noncentrosymmetric Re24Ti5 compound can be characterized as a moderately coupled BCS-type superconductor. Furthermore, the obtained parameters from the present study of Re24Ti5 were compared to those of the isostructural compound Re23.8Nb5.2, indicating the similarity between both systems.
URI: http://dx.doi.org/10.1088/0953-2048/26/5/055011
http://hdl.handle.net/11536/21658
ISSN: 0953-2048
DOI: 10.1088/0953-2048/26/5/055011
期刊: SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Volume: 26
Issue: 5
結束頁: 
Appears in Collections:Articles


Files in This Item:

  1. 000317570000012.pdf

If it is a zip file, please download the file and unzip it, then open index.html in a browser to view the full text content.