Evidence for Dirac-like excitations in SrFe2As2 from Quantum Oscillation Experiments (CROSBI ID 575249)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
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. ;
engleski
Evidence for Dirac-like excitations in SrFe2As2 from Quantum Oscillation Experiments
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).
pnictide superconductors; Fermi-surface; Dirac-like dispersion
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Podaci o prilogu
368-368.
2011.
objavljeno
Podaci o matičnoj publikaciji
LT26 The 26th International Conference on Low Temperature Physics, LT26_Booklet
Zhong-Xian Zhao, Li Lu
Peking: Chinese Academy of Sciences
Podaci o skupu
LT26 The 26th International Conference on Low Temperature Physics
poster
10.08.2011-17.08.2011
Peking, Kina