X-ray Diffraction Study of MgB2 at Low Temperatures |
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| Authors: | Y. Xue S. Asada A. Hosomichi S. Naher J. Xue H. Kaneko H. Suzuki T. Muranaka J. Akimitsu |
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| Affiliation: | (1) Department of Physics, Kanazawa University, Kakuma-machi 920-1192, Japan;(2) Department of Physics and Mathematics, Aoyama-Gakuin University, Sagamihara 229-8558, Japan |
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| Abstract: | We have performed powder X-ray diffraction of MgB2 superconductor between 10 and 300 K. Temperature dependence of integrated intensities of both (002) and (110) X-ray reflections shows a peak at around TC, superconducting transition temperature. The integrated intensity of the X-ray reflection is related to the phonon frequency through a Debye--Waller factor. Lattice parameters a and c show negative thermal expansions at low temperatures. The negative thermal expansion might be due to an electronic origin and not directly related to the superconducting transition. |
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| Keywords: | superconductivity MgB2 negative thermal expansion X-ray diffraction Fermi liquid electron--photon interaction |
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