Naslov
Evidence for Dirac-like excitations in SrFe2As2 from Quantum Oscillation Experiments

Autori
Sutherland, M. ; Hills, D. ; Tan, B. ; Altarawneh, M. ; Harrison, N. ; Gillett, J. ; Farrell, O’, Goh, S. ; Bensemann, T. ; Kokanovic, Ivan ; Syers, P. ; Cooper, J.R. ; Sebastian, S.E. ;

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
LT26 The 26th International Conference on Low Temperature Physics, LT26_Booklet / Zhong-Xian Zhao, Li Lu - Peking : Chinese Academy of Sciences, 2011, 368-368

Skup
LT26 The 26th International Conference on Low Temperature Physics

Mjesto i datum
Peking, Kina, 10.08.2011. - 17.08.2011

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
pnictide superconductors; Fermi-surface; Dirac-like dispersion

Sažetak
The antiferromagnetic parent compounds of the high 𝑇𝑐 pnictide superconductors play host to unusual magnetic and electronic properties which may be closely related to the presence of superconductivity in the doped compounds. Recent theoretical1 and experimental, 2 work have suggested the presence of small Fermi-surface pockets in these compounds with regions in k-space characterized by a Dirac-like dispersion. Here we test this scenario by performing quantum oscillation studies on high quality single crystal samples of SrFe2As2 to 60 T in pulsed magnetic elds. By tracking the ratio of the quasiparticle e ective mass m⋆ to the quantum oscillation frequency as a function of magnetic eld angle, we observe a dependence consistent with that expected for the Dirac dispersion scenario. We discuss the implications of this result on understanding the metallic state of the FeAs parent compounds. 1 N. Harrison and SE Sebastian, Phys. Rev. B. 80, 224512 (2009). 2 P. Richard P, K. Nakayama, T. Sato et. al., Phys. Rev. Lett. 104, 137001 (2010).

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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