Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 19: Poster Session: Correlated Electrons 1

TT 19.21: Poster

Monday, March 20, 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 Klauss¹ — ¹Institute 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 T_N≈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.