Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 110: Superconductivity: Fe-based Superconductors - 1111 and Others
TT 110.5: Vortrag
Freitag, 16. März 2018, 10:30–10:45, H 3010
Equivalence of hydrostatic and chemical pressure? Suppression of the magnetism in CeFeAsO — •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 detailed study of the equivalence of hydrostatic and chemical (due to As by P substitution) pressure in CeFeAsO by means of energy- and time-domain Mössbauer spectroscopy. 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. We found a quantitatively equal suppression of the magnetic order below a P-substitution level of 5 % and hydrostatic pressures below 0.3 GPa. Above these values the suppression is qualitatively different. Our findings set an upper boundary for the equal treatment of chemical and hydrostatic pressure in this system.