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Phys Rev Lett. 2011 Feb 25;106(8):087001. Epub 2011 Feb 22.

Quasiparticle interference of C2-symmetric surface states in a LaOFeAs parent compound.

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Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Haidian, Beijing 100084, People's Republic of China.


We present scanning tunneling microscopy studies of the LaOFeAs parent compound of iron pnictide superconductors. High resolution spectroscopic imaging reveals strong standing wave patterns induced by quasiparticle interference of two-dimensional surface states. Fourier analysis shows that the distribution of scattering wave vectors exhibits pronounced twofold (C(2)) symmetry, strongly reminiscent of the nematic electronic state found in CaFe(1.94)Co(0.06)As(2). The implications of these results to the electronic structure of the pnictide parent states will be discussed.

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