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

The temperature dependences of the lattice parameters are 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 is observed and explained in detail. © 2005 American Institute of Physics. [ABSTRACT FROM AUTHOR]