Coexistence of charge and ferromagnetic order in fcc Fe

Pin-Jui Hsu (), Jens Kügel, Jeannette Kemmer, Francesco Parisen Toldin, Tobias Mauerer, Matthias Vogt, Fakher Assaad and Matthias Bode
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Pin-Jui Hsu: Physikalisches Institut, Experimentelle Physik II, Universität Würzburg
Jens Kügel: Physikalisches Institut, Experimentelle Physik II, Universität Würzburg
Jeannette Kemmer: Physikalisches Institut, Experimentelle Physik II, Universität Würzburg
Francesco Parisen Toldin: Institut für Theoretische Physik und Astrophysik, Universität Würzburg
Tobias Mauerer: Physikalisches Institut, Experimentelle Physik II, Universität Würzburg
Matthias Vogt: Physikalisches Institut, Experimentelle Physik II, Universität Würzburg
Fakher Assaad: Institut für Theoretische Physik und Astrophysik, Universität Würzburg
Matthias Bode: Physikalisches Institut, Experimentelle Physik II, Universität Würzburg

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: Abstract Phase coexistence phenomena have been intensively studied in strongly correlated materials where several ordered states simultaneously occur or compete. Material properties critically depend on external parameters and boundary conditions, where tiny changes result in qualitatively different ground states. However, up to date, phase coexistence phenomena have exclusively been reported for complex compounds composed of multiple elements. Here we show that charge- and magnetically ordered states coexist in double-layer Fe/Rh(001). Scanning tunnelling microscopy and spectroscopy measurements reveal periodic charge-order stripes below a temperature of 130 K. Close to liquid helium temperature, they are superimposed by ferromagnetic domains as observed by spin-polarized scanning tunnelling microscopy. Temperature-dependent measurements reveal a pronounced cross-talk between charge and spin order at the ferromagnetic ordering temperature about 70 K, which is successfully modelled within an effective Ginzburg–Landau ansatz including sixth-order terms. Our results show that subtle balance between structural modifications can lead to competing ordering phenomena.

Date: 2016
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DOI: 10.1038/ncomms10949

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