Nicolaou, Alessandro, Gatti, Matteo, Magnano, Elena, Le Fevre, Patrick, Bondino, Federica ORCID: 0000-0001-6505-9319, Bertran, Francois, Tejeda, Antonio, Sauvage-Simkin, Michele, Vlad, Alina ORCID: 0000-0001-7319-0093, Garreau, Yves, Coati, Alessandro, Guerin, Nicolas, Parmigiani, Fulvio and Taleb-Ibrahimi, Amina (2015). Fermi surface symmetry and evolution of the electronic structure across the paramagnetic-helimagnetic transition in MnSi/Si(111). Phys. Rev. B, 92 (8). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1550-235X

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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 T-C similar to 40 K, along with the appearance of sharp quasiparticle emission below T-C. 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 T-C, along with the persistence of the d-band splitting well above T-C, 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.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Nicolaou, AlessandroUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gatti, MatteoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Magnano, ElenaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Le Fevre, PatrickUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bondino, FedericaUNSPECIFIEDorcid.org/0000-0001-6505-9319UNSPECIFIED
Bertran, FrancoisUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tejeda, AntonioUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sauvage-Simkin, MicheleUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vlad, AlinaUNSPECIFIEDorcid.org/0000-0001-7319-0093UNSPECIFIED
Garreau, YvesUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Coati, AlessandroUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guerin, NicolasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Parmigiani, FulvioUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Taleb-Ibrahimi, AminaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-396546
DOI: 10.1103/PhysRevB.92.081110
Journal or Publication Title: Phys. Rev. B
Volume: 92
Number: 8
Date: 2015
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 1550-235X
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
T-MATRIX THEORY; LIQUID PHASE; MNSI; PHOTOEMISSION; FERROMAGNETS; METAL; NI; GWMultiple languages
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/39654

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