Session C1: Poster Session I (2-5:00pm): Polymer Physics; Applications; Complex Structured Materials; Quantum Fluids; Nano/Bionanotechnology; Fluids; General; Statistical & Nonlinear; Superconductors
2:00 PM–2:00 PM, Monday, March 16, 2009
Room: Exhibit Hall A
Abstract ID: BAPS.2009.MAR.C1.298
Abstract: C1.00298 : Superconductivity in (La,Y)FeAs(O,F) pncitides
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Abstract
Authors:
Matteo Tropeano
(LAMIA-INFM-CNR, Genova- Italy \& Dipartimento di Fisica, Genova- Italy)
Carlo Ferdeghini
(LAMIA-INFM-CNR, Genova- Italy)
Carlo Fanciulli
(LAMIA-INFM-CNR, Genova– Italy)
Alberto Martinelli
(LAMIA-INFM-CNR, Genova- Italy)
Andrea Palenzona
(Dipartimento di Chimica e Chimica Industriale, Genova – Italy \& LAMIA-INFM-CNR)
Marina Putti
(LAMIA-INFM-CNR \& Dipartimento di Fisica \& Applied Superconductivity Cen)
Roberta Cimberle
(IMEM-CNR, Genova- Italy)
Fabio Canepa
(Dipartimento di Chimica e Chimica Industriale, Via Dodecaneso 31, 16146 Genova – ITALY \& IMEM-CNR, Genova- Italy)
The structural, magnetic and resistive properties of (La$_{1-x}$Y$_{x})$FeAs(O$_{0.85}$F$_{0.15})$ (x $\le $ 0.7) compounds prepared at normal pressure were investigated. Substituting La with Y decreases the ionic size at the rare earth site, determining a progressive decrease of both cell edges; as a result a notable increase of the superconductive transition temperature is observed. In particular T$_{C}$ increases with Y content, up to a maximum value of 39.8 K for x = 0.5, followed by the a slight decrease for x = 0.7 (T$_{C}$ = 35.9 K). The resistivity curve of the corresponding undoped compound, (La$_{0.5}$Y$_{0.5})$FeAsO, exhibits the typical bump related to the SDW onset; the first derivative curves for (La$_{0.5}$Y$_{0.5})$FeAsO and LaFeAsO are almost superposed around T$_{SDW}$.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2009.MAR.C1.298