Evidence for Dirac nodes from quantum oscillations in SrFe2As2

Znanstveni rad - Izvorni znanstveni rad

• Autor: Mike Sutherland
• Autor: D. J. Hills
• Autor: B. S. Tan
• Autor: M. M. Altarawneh
• Autor: N. Harrison
• Autor: J. Gillett
• Autor: E. C. T. O'Farrell
• Autor: T. M. Benseman
• Autor: Ivan Kokanović
• Autor: P. Syers
• Autor: J. R. Cooper
• Autor: Suchitra E. Sebastian
• Autorova ustanova: Sveučilište u Zagrebu; Prirodoslovno-matematički fakultet; (Fizički odsjek)
• Znanstveno / umjetničko područje, polje i grana: PRIRODNE ZNANOSTI; Fizika

Sažetak (engleski)

We present a detailed study of quantum oscillations in the antiferromagnetically ordered pnictide compound SrFe2As2 as the angle between the applied magnetic field and crystalline axes is varied. Our measurements were performed on high-quality single crystals in a superconducting magnet, and in pulsed magnetic fields up to 60 T, allowing us to observe orbits from several small Fermi-surface pockets. We extract the cyclotron effective mass m☆ and frequency F for these orbits and track their values as the field is rotated away from the c axis. While a constant ratio of m☆/F is expected for a parabolic band, we observe deviations from this behavior. We conclude that this observation points to orbits derived from a band with Dirac dispersion near the Fermi level.

• Ključne riječi (engleski): pnictide compound SrFe2As2; quantum oscillations; Dirac Nodes
• Jezik: engleski
• Vrsta publikacije: Znanstveni rad - Izvorni znanstveni rad
• Status objave: Objavljen
• Vrsta recenzije: Recenziran - međunarodna recenzija
• Verzija publikacije: Objavljena verzija rada (izdavačev PDF)
• Naslov časopisa: Physical review B: Condensed matter and materials physics
• Brojčani podaci: vol. 84, br. 18, 180506(R)
• p-ISSN: 1098-0121
• e-ISSN: 1550-235X
• DOI: https://doi.org/10.1103/PhysRevB.84.180506
• URN:NBN: urn:nbn:hr:217:725614
• Datum objave publikacije: 2011
• Projekt: Šifra: 119-1191458-1008; Naziv (hrvatski): Električna i magnetska svojstva odabranih anorganskih i organskih materijala; Voditelj: Ivan Kokanović; Pravna nadležnost: Hrvatska; Financijer: MZOS; Linija financiranja: ZP
• URL dokumenta: http://link.aps.org/doi/10.1103/PhysRevB.84.180506
• Vrsta resursa: Tekst
• Prava pristupa: Otvoreni pristup
• Javna napomena: Copyright (2011) by the American Physical Society. Received 8 July 2011; revised manuscript received 2 August 2011; published 14 November 2011.
• Datum i vrijeme pohrane: 2019-11-15 17:01:16