Structural phase transition and superlattice misfit strain of RFeAsO (R=La, Pr, Nd, Sm)

TitleStructural phase transition and superlattice misfit strain of RFeAsO (R=La, Pr, Nd, Sm)
Publication TypeJournal Article
Year of Publication2010
AuthorsRicci A, Poccia N, Joseph B, Barba L, Arrighetti G, Ciasca G, Yan JQ, McCallum RW, Lograsso TA, Zhigadlo ND, Karpinski J, Bianconi A
Journal TitlePhysical Review B
Date Published10/11
ISBN Number1098-0121
Accession NumberISI:000282748800004
Keywordscuprate perovskites, DIAGRAM, heterostructures, LATTICE, microstrain, size, superconductors, systems

The tetragonal-to-orthorhombic structural phase transition (SPT) in LaFeAsO (La-1111) and SmFeAsO (Sm-1111) single crystals measured by high-resolution x-ray diffraction is found to be sharp while the RFeAsO (R= La, Nd, Pr, Sm) polycrystalline samples show a broad continuous SPT. Comparing the polycrystalline and the single-crystal 1111 samples, the critical exponents of the SPT are found to be the same while the correlation length critical exponents are found to be very different. These results imply that the lattice fluctuations in 1111 systems change in samples with different surface to volume ratio that is assigned to the relieve of the temperature-dependent superlattice misfit strain between active iron layers and the spacer layers in 1111 systems. This phenomenon that is missing in the AFe(2)As(2) (A=Ca, Sr, Ba) "122" systems, with the same electronic structure but different for the thickness and the elastic constant of the spacer layers, is related with the different maximum superconducting transition temperature in the 1111 (55 K) versus 122 (35 K) systems and implies the surface reconstruction in 1111 single crystals.

URL<Go to ISI>://000282748800004
Alternate JournalPhys Rev B