Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 28: Correlated Electrons: Spin Systems, Itinerant Magnets 3
TT 28.4: Vortrag
Dienstag, 12. März 2013, 10:15–10:30, H19
Analysis of chemical and external pressures in ReCoPO (Re = La, Pr) and LaCoAsO by means of µ+ spin spectroscopy — •Giacomo Prando1, Pietro Bonfà2, Gianni Profeta3, Rustem Khasanov4, Fabio Bernardini5, Marcello Mazzani2, Eva Maria Bruening1, Anand Pal6, Veer Awana6, Hans-Joachim Grafe1, Bernd Buechner1, Roberto De Renzi2, Pietro Carretta7, and Samuele Sanna7 — 1Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW) Dresden, Germany — 2Dipartimento di Fisica, Universitá di Parma and CNISM, Italy — 3SPIN-CNR and Dipartimento di Fisica, Universitá dell’Aquila, Italy — 4Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, Switzerland — 5Dipartimento di Fisica, Universitá di Cagliari, Italy — 6National Physical Laboratory (CSIR), New Delhi, India — 7Dipartimento di Fisica,, Universitá di Pavia and CNISM, Italy
In this contribution we will discuss the local magnetic properties of ReCoPO (Re = La, Pr) as investigated by means of muon spin spectroscopy. Electrons localized on the Pr3+ ions do not play any role in the overall magnetic features of the compounds. The increase of the chemical pressure triggered by the different ionic radii of La3+ and Pr3+ plays a crucial role in enhancing the value of the critical temperature to the magnetic phase and can be mimicked by the application of external hydrostatic pressure. A sharp discontinuity in the local magnetic field at the muon site in LaCoPO suggests a sizeable modification in the band structure of the material upon increasing P. This scenario is qualitatively supported by ab-initio DFT calculations.