Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 98: Poster Session: Superconductivity
TT 98.15: Poster
Donnerstag, 15. März 2018, 15:00–19:00, Poster B
Electronic phase diagram of CeFeAsO as a function of hydrostatic pressure and As by P substitution — •Philipp Materne1,2, Wenli Bi2,3, Esen Ercan Alp2, Jiyong Zhao2, Michael Yu Hu2, Dongzhou Zhang2, Til Goltz1, Anton Jesche4, Christoph Geibel4, Rhea Kappenberger5, Saicharan Aswartham5, Sabine Wurmehl5,1, Bernd Büchner5,1, and Hans-Henning Klauss1 — 1Institute of Solid State and Materials Physics, TU Dresden, D-01069 Dresden, Germany — 2Argonne National Laboratory, Argonne, IL 60439, USA — 3Department of Geology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA — 4Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany — 5Leibniz Institute for Solid State and Materials Research (IFW) Dresden, D-01069, Germany
We present a local probe study of the electronic properties of hydrostatic and chemical (due to As by P substitution) pressure in CeFeAsO by means of energy- and time-domain Mössbauer spectroscopy. The application of pressure results in a compression of the unit cell. We investigated the magnetic hyperfine field, the electric field gradient, and the electron density at the Fe nucleus. We found a distortion of the FeAs tetrahedra with increased P-substitution level while it remains unchanged in the case of hydrostatic pressure. We observed a nearly linear suppression of the magnetic hyperfine field to zero between 0 and 40 % P-substitution level while the field is reduced by 25 % between 0 and 4.5 GPa followed by an abrupt decrease to zero at 5.2 GPa.