X-ray diffraction study of spontaneous strain in superconducting

✍ Scribed by H. Fujishita; T. Yamada; S. Nakada; H. Okamoto; S. Shitara; M. Kato; Y. Koike

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 468 KB
• Volume: 150
• Category: Article
• ISSN: 0038-1098
• DOI: 10.1016/j.ssc.2010.01.040

✦ Synopsis

The lattice parameter of Ba 0.6 K 0.4 BiO 3 , which is a well-studied conventional superconductor, was measured by the X-ray Rietveld method between 10 K and room temperature. A very small change in the lattice parameter could be detected in the superconducting phase. The change could be attributed to a spontaneous strain generated in the superconducting phase by the coupling between a superconducting order parameter and the strain. Previously published data on YBa 2 Cu 3 O 6.5 and MgB 2 were analyzed, and the present results were compared with our previously obtained results on La 1.85 Sr 0.15 CuO 4 . It was concluded that this coupling phenomenon is common to all superconductors.