Sep 12 – 17, 2010
CERN
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Fe as Local Probe to follow the Competition between Magnetism and Superconductivity in the New Fe-pnictide Superconductors

Sep 14, 2010, 2:00 PM
20m
500/1-001 - Main Auditorium (CERN)

500/1-001 - Main Auditorium

CERN

72
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ORAL CONTRIBUTION Magnetism and Magnetic materials - Bulk and thin layers MAGNETISM AND MAGNETIC MATERIALS: BULK AND THIN FILMS

Speaker

Prof. Elisa Baggio Saitovitch (Centro Brasileiro de Pesquisas Fisicas)

Description

Abstract

Summary

The 57Fe Mössbauer spectroscopy has been used to follow the appearance of magnetic order and structural transition induced by composition or temperature changes in some Fe-pnictide compounds. In the case of doped compounds by F, K and Na in CeFeAsO1-xFx, Ba1-xK xFe2As2 and Sr1-x Na x Fe2As2 superconductivity was established. The studies have been performed on some RFeAsO1-xFx (R = Ce, Nd) polycrystalline samples of as well as in Ba0.5K0.5Fe2As2 and Sr0.5Na0.5Fe2As2 single crystal samples. Other Mössbauer studies have shown evidence for magnetism and superconductivity on Sr4V2O6Fe2As2, and Sr4Sc2O6Fe2As2 would show a magnetic ordering without a homogeneous structure. The magnetic transition temperature and the type of transition will be discussed, as well as the coexistence of magnetism and superconductivity.

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Primary author

Prof. Elisa Baggio Saitovitch (Centro Brasileiro de Pesquisas Fisicas)

Co-authors

Prof. Dalber Sanchez Candela (Universidade Federal Fluminense) Dr G. F. Cheng (Beijing National Lab. for Condensed Matter Physics, C. A. of Sciences) Prof. H. H. Wen (National Laboratory for Superconductivity, Institute of Physics, and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences) Mr Julian Munevar (Centro Brasileiro de Pesquisas Fisicas) Dr Mariella Alzamora (Centro Brasileiro de Pesquisas Fisicas) Prof. N. L. Wang (Beijing National Lab. for Condensed Matter Physics, C. A. of Sciences) Prof. P. C. Canfield (Ames Laboratory, US D.O.E and Iowa University) Prof. S. L. Bud'ko (Ames Laboratory, US D.O.E and Iowa University)

Presentation materials