title: Coexistence of charge and ferromagnetic order in fcc Fe.
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.
authors.affiliation: Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
authors.forename: Pin-Jui
authors.initials: PJ
authors.lastname: Hsu
authors.affiliation: Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
authors.forename: Jens
authors.initials: J
authors.lastname: Kügel
authors.affiliation: Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
authors.forename: Jeannette
authors.initials: J
authors.lastname: Kemmer
authors.affiliation: Institut für Theoretische Physik und Astrophysik, Universität Würzburg, 97074 Würzburg, Germany.
authors.forename: Francesco
authors.initials: F
authors.lastname: Parisen Toldin
authors.affiliation: Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
authors.forename: Tobias
authors.initials: T
authors.lastname: Mauerer
authors.affiliation: Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Vogt
authors.affiliation: Institut für Theoretische Physik und Astrophysik, Universität Würzburg, 97074 Würzburg, Germany.
authors.forename: Fakher
authors.initials: F
authors.lastname: Assaad
authors.affiliation: Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.|Wilhelm Conrad Röntgen-Center for Complex Material Systems (RCCM), Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Bode
mesh_terms: D003080:Cold Temperature; D007501:Iron / Q000737:chemistry*; D008280:Magnetics; D059346:Magnets / Q000737:chemistry*; D016252:Microscopy, Scanning Tunneling; D012238:Rhodium / Q000737:chemistry*; D055672:Static Electricity
chemical_list: D012238:Rhodium; D007501:Iron