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Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 19: Poster Session: Correlated Electrons 1

TT 19.21: Poster

Montag, 20. März 2017, 15:00–19:00, P2-EG

Magnetic order and spin dynamics in a helical magnetic system Fe3PO4O3 — •Rajib Sarkar1, Sirko Kamusella1, Sascha Albert Bräuninger1, Stefan Holenstein2, Hubertus Luetkens2, James Neilson3, Michael Tarne3, Kate Ross3, and Hans-Henning Klauss11Institute for Solid State Physics, TU Dresden, D-01069, Germany — 2Department of Physics, Colorado State University, Fort Collins, Colorado 80523-1875, USA — 3Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, Switzerland

The 3d-electronic spin dynamics and the magnetic order in Fe3PO4O3 were investigated by µSR and the 57Fe Mössbauer experiments. Zero field (ZF)-µSR and the 57Fe Mössbauer studies prove the static long range magnetic ordering below TN≈163 K. Both transverse field (TF) and ZF-µSR results evidence 100% magnetic volume fraction in the ordered state. ZF-µSR time spectra can be best described by a Bessel function which is consistent with the helical type of magnetic structure as proposed by the neutron scattering experiments. 57Fe Mössbauer results are also consistent with the helical magnetic structure. While spin-lattice relaxation rate (λ) exhibits a peak at the magnetic ordering related to the critical fluctuations, another peak shows up also at around 35 K signaling the presence of secondary relevant energy scale in Fe3PO4O3.

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