Magnetic order and spin dynamics in ${\mathrm{La}}_{2}{\mathrm{O}}_{2}{\mathrm{Fe}}_{2}{\mathrm{OSe}}_{2}$ probed by $^{57}\mathrm{Fe}$ M\"ossbauer, $^{139}\mathrm{La}$ NMR, and muon-spin relaxation spectroscopy

Magnetic order and spin dynamics in ${La}_{2} O_{2} {Fe}_{2} {OSe}_{2}$ probed by ${}^{57}{Fe}$ Mössbauer, ${}^{139}{La}$ NMR, and muon-spin relaxation spectroscopy

M. Günther, S. Kamusella, R. Sarkar, T. Goltz, H. Luetkens, G. Pascua, S.-H. Do, K.-Y. Choi, H. D. Zhou, C. G. F. Blum, S. Wurmehl, B. Büchner, and H.-H. Klauss

Phys. Rev. B 90, 184408 – Published 7 November 2014

Abstract

We present a detailed local probe study of the magnetic order in the oxychalcogenide ${La}_{2} O_{2} {Fe}_{2} {OSe}_{2}$ utilizing ${}^{57}{Fe}$ Mössbauer, ${}^{139}{La}$ NMR, and muon-spin relaxation spectroscopy. This system can be regarded as an insulating reference system of the Fe arsenide and chalcogenide superconductors. From the combination of the local probe techniques we identify a noncollinear magnetic structure similar to ${Sr}_{2} F_{2} {Fe}_{2} {OS}_{2}$ . The analysis of the magnetic order parameter yields an ordering temperature $T_{N} = 90.1 K$ and a critical exponent of $β = 0.133$ , which is close to the two-dimensional Ising universality class as reported in the related oxychalcogenide family.

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Received 1 April 2014
Revised 15 October 2014

DOI:https://doi.org/10.1103/PhysRevB.90.184408

Authors & Affiliations

M. Günther^1,*, S. Kamusella¹, R. Sarkar¹, T. Goltz¹, H. Luetkens², G. Pascua², S.-H. Do³, K.-Y. Choi³, H. D. Zhou^4,5, C. G. F. Blum⁶, S. Wurmehl^6,1, B. Büchner^6,1, and H.-H. Klauss¹

¹Institut für Festkörperphysik, Technische Universität Dresden, D-01069 Dresden, Germany
²Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
³Department of Physics, Chung-Ang University, Seoul 156-756, Republic of Korea
⁴Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200, USA
⁵National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306-4005, USA
⁶Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW) Dresden, D-01171 Dresden, Germany

^*guenth42@googlemail.com

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Vol. 90, Iss. 18 — 1 November 2014

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Physical Review B

covering condensed matter and materials physics

Magnetic order and spin dynamics in ${La}_{2} O_{2} {Fe}_{2} {OSe}_{2}$ probed by ${}^{57}{Fe}$ Mössbauer, ${}^{139}{La}$ NMR, and muon-spin relaxation spectroscopy

M. Günther, S. Kamusella, R. Sarkar, T. Goltz, H. Luetkens, G. Pascua, S.-H. Do, K.-Y. Choi, H. D. Zhou, C. G. F. Blum, S. Wurmehl, B. Büchner, and H.-H. Klauss

Phys. Rev. B 90, 184408 – Published 7 November 2014

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Physical Review B

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Magnetic order and spin dynamics in La2O2Fe2OSe2 probed by Fe57 Mössbauer, La139 NMR, and muon-spin relaxation spectroscopy

M. Günther, S. Kamusella, R. Sarkar, T. Goltz, H. Luetkens, G. Pascua, S.-H. Do, K.-Y. Choi, H. D. Zhou, C. G. F. Blum, S. Wurmehl, B. Büchner, and H.-H. Klauss

Phys. Rev. B 90, 184408 – Published 7 November 2014

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Magnetic order and spin dynamics in ${La}_{2} O_{2} {Fe}_{2} {OSe}_{2}$ probed by ${}^{57}{Fe}$ Mössbauer, ${}^{139}{La}$ NMR, and muon-spin relaxation spectroscopy