Low Temperature Physics: 31, 263 (2005); https://doi.org/10.1063/1.1884428 (5 pages)
Физика Низких Температур: Том 31, Выпуск 3-4 (Март 2005), c. 350-355    ( к оглавлению , назад )

Negative thermal expansion of HTSC-type structures:low temperature structure measurementson Eu1+x(Ba1-yRy)2-xCu3O7-d compounds and theoretical treatment

V.V. Eremenko, S.B. Feodosyev, I.A. Gospodarev, V.A. Sirenko, and M.Yu. Shvedun

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: eremenko@ilt.kharkov.ua

W. McCallum

Ames Lab., Iowa, USA

M. Tovar

Berlin Neutron Scattering Center, Hahn-Meitner-Institute, Germany

Received November 4, 2004

Аннотация

The temperature dependences of the lattice parameters were investigated on the perovskite-like structures Eu1+x(Ba1-yRy)2-xCu3O7-d with Ba substitution by light rare earth, using x-ray diffraction techniques. A negative thermal expansion effect was observed and explained in detail.

PACS:
63.20.-e - Phonons in crystal lattices (for phonons in superconductors, see 74.25.Kc; see also 43.35.Gk Phonons in crystal lattice, quantum acoustics�in acoustics appendix)