Three- to two-dimensional transition of the electronic structure in CaFe&lt;sub&gt;2&lt;/sub&gt;As&lt;sub&gt;2&lt;/sub&gt;: a parent compound for an iron arsenic high-temperature superconductor

Liu, Chang; Kondo, Takeshi; Ni, Ni; Palczewski, A.D.; Bostwick, A.; Samolyuk, G.D.; Khasanov, R.; Shi, M.; Rotenberg, E.; Bud'Ko, S.L.; Canfield, P.C.; Kaminski, A.

doi:10.1103/PhysRevLett.102.167004

Three- to two-dimensional transition of the electronic structure in CaFe₂As₂: a parent compound for an iron arsenic high-temperature superconductor

Liu C, Kondo T, Ni N, Palczewski AD, Bostwick A, Samolyuk GD, Khasanov R, Shi M, Rotenberg E, Bud'Ko SL, Canfield PC & Kaminski A

Citation

Liu, C., Kondo, T., Ni, N., Palczewski, A. D., Bostwick, A., Samolyuk, G. D., … Kaminski, A. (2009). Three- to two-dimensional transition of the electronic structure in CaFe₂As₂: a parent compound for an iron arsenic high-temperature superconductor. Physical Review Letters, 102(16), 167004 (4 pp.). https://doi.org/10.1103/PhysRevLett.102.167004

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:17343

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 (T_s) Fermi surfaces around Γ and X points are cylindrical and quasi 2D. Below Ts, the Γ pocket forms a 3D ellipsoid, while the X pocket remains quasi 2D. This finding strongly suggests that low dimensionality plays an important role in understanding the superconducting mechanism in pnictides.

Details

Publication Type

Journal Article

Title

Three- to two-dimensional transition of the electronic structure in CaFe₂As₂: a parent compound for an iron arsenic high-temperature superconductor

Author(s)

Liu, Chang

Kondo, Takeshi

Ni, Ni

Palczewski, A.D.

Bostwick, A.

Samolyuk, G.D.