https://doi.org/10.1140/epjb/e2011-20336-2
Regular Article
X-ray diffraction study of spontaneous strain in Fe-pnictide superconductor, NdFeAsO0.89F0.11
1 School of Mathematics and Physics, Kanazawa University, 920-1192 Kanazawa, Japan
2 Division of Mathematical and Physical Sciences, Kanazawa University, 920-1192 Kanazawa, Japan
3 School of Health Sciences, Kanazawa University, 920-0942 Kanazawa, Japan
4 School of Environmental Design, Kanazawa University, 920-1192 Kanazawa, Japan
5 Department of Physics, Nagoya University, Furo-cho, Chikusa-ku, 464-8602 Nagoya, Japan
6 JST, TRIP, Nagoya University, Furo-cho, Chikusa-ku, 464-8602 Nagoya, Japan
7 Toyota Physical and Chemical Research Institute, Nagakute, 480-1192 Aichi, Japan
a
e-mail: fujishit@staff.kanazawa-u.ac.jp
Received: 2 May 2011
Received in final form: 5 December 2011
Published online: 8 February 2012
The lattice parameters of a Nd 1111 Fe-pnictide superconductor, NdFeAsO0.89F0.11, were accurately measured using X-ray diffraction between 20 K and 280 K. A very small change in the lattice parameter could be detected in the superconducting phase. This change can be attributed to a spontaneous strain generated in the superconducting phase by the coupling between a superconducting order parameter and the strain. The present results are compared with the thermal expansion coefficients of Ba (Fe1−xCox)2As2, in addition to the previous lattice parameter measurements of YBa2Cu3O6.5, MgB2, La1.85Sr0.15CuO4, and Ba0.6K0.4BiO3.
Key words: Solid State and Materials
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2012