Abstract
Results of the first complete measurements of Bragg reflections for a monocrystal of Nb 3Sn with superconducting transition temperature T c = 18.2 K have been obtained. A high anisotropy in the vibrations of the atoms along and across the chains of the transition metal suggests a covalent character of the chemical bond between the atoms. For Nb 3Sn, the anisotropy is maximum among the superconducting single crystals of the investigated A15 compounds. A correlation between the value of T c and the degree of anisotropy of the thermal vibrations of the transition metal atoms has been found.
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