Physics – Condensed Matter – Superconductivity
Scientific paper
2009-03-25
Phys. Rev. Lett.102,167004 (2009)
Physics
Condensed Matter
Superconductivity
Submitted to Phys. Rev. Lett. at 21 January 2009, Accepted for publication at 24 March 2009
Scientific paper
10.1103/PhysRevLett.102.167004
We use angle-resolved photoemission spectroscopy (ARPES) to study the electronic properties of CaFe2As2 - parent compound of a pnictide superconductor. We find that the structural and magnetic transition is accompanied by a three- to two-dimensional (3D-2D) crossover in the electronic structure. Above the transition temperature (Ts) Fermi surfaces around Gamma and X points are cylindrical and quasi-2D. Below Ts the former becomes a 3D ellipsoid, while the latter remains quasi-2D. This finding strongly suggests that low dimensionality plays an important role in understanding the superconducting mechanism in pnictides.
Bostwick Aaron
Bud`ko S. L.
Canfield Paul. C.
Kaminski Adam
Khasanov Rustem
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