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Fermi surface symmetry and evolution of the electronic structure across the paramagnetic-helimagnetic transition in MnSi/Si(111)

Alessandro Nicolaou, Matteo Gatti, Elena Magnano, Patrick Le Fèvre, Federica Bondino, François Bertran, Antonio Tejeda, Michèle Sauvage-Simkin, Alina Vlad, Yves Garreau, Alessandro Coati, Nicolas Guérin, Fulvio Parmigiani, and Amina Taleb-Ibrahimi
Phys. Rev. B 92, 081110(R) – Published 11 August 2015
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Abstract

MnSi has been extensively studied for five decades; nonetheless detailed information on the Fermi surface (FS) symmetry is still lacking. This missed information prevents a comprehensive understanding of the nature of the magnetic interaction in this material. Here, by performing angle-resolved photoemission spectroscopy on high-quality MnSi films epitaxially grown on Si(111), we unveil the FS symmetry and the evolution of the electronic structure across the paramagnetic-helimagnetic transition at TC40K, along with the appearance of sharp quasiparticle emission below TC. The shape of the resulting FS is found to fulfill robust nesting effects. These effects can be at the origin of strong magnetic fluctuations not accounted for by the state-of-the-art quasiparticle self-consistent GW approximation. From this perspective, the unforeseen quasiparticle damping detected in the paramagnetic phase and relaxing only below TC, along with the persistence of the d-band splitting well above TC, at odds with a simple Stoner model for itinerant magnetism, opens the search for exotic magnetic interactions favored by FS nesting and affecting the quasiparticle lifetime.

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  • Received 23 September 2014
  • Revised 13 April 2015

DOI:https://doi.org/10.1103/PhysRevB.92.081110

©2015 American Physical Society

Authors & Affiliations

Alessandro Nicolaou1,*, Matteo Gatti1,2,3, Elena Magnano4, Patrick Le Fèvre1, Federica Bondino4, François Bertran1, Antonio Tejeda1,5, Michèle Sauvage-Simkin1, Alina Vlad1, Yves Garreau1,6, Alessandro Coati1, Nicolas Guérin7, Fulvio Parmigiani8,9,10, and Amina Taleb-Ibrahimi11

  • 1Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
  • 2Laboratoire des Solides Irradiés, École Polytechnique, CNRS-CEA/DSM, F-91128 Palaiseau, France
  • 3European Theoretical Spectroscopy Facility (ETSF)
  • 4CNR-IOM, Laboratorio TASC, S.S. 14 Km 163.5, 34149 Basovizza, Trieste, Italy
  • 5Université de Lorraine, UMR CNRS 7198, Institut Jean Lamour, BP 239, F-54506 Vandoeuvre-ls-Nancy, France
  • 6MPQ, Université Denis Diderot Paris VII, Bâtiment Condorcet, F-75205 Paris Cedex 13, France
  • 7Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
  • 8Elettra-Sincrotrone Trieste, Strada Statale 14, 34149 Basovizza, Trieste, Italy
  • 9Università degli Studi di Trieste, Via A. Valerio 2, 34127 Trieste, Italy
  • 10International Faculty, University of Cologne, Germany
  • 11UR1-CNRS/Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France

  • *nicolaou@synchrotron-soleil.fr

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Issue

Vol. 92, Iss. 8 — 15 August 2015

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