Abstract
The nematic phase in iron based superconductors (IBSs) has attracted attention with a notion that it may provide important clue to the superconductivity. A series of angle-resolved photoemission spectroscopy (ARPES) studies were performed to understand the origin of the nematic phase. However, there is lack of ARPES study on LaFeAsO nematic phase. Here, we report the results of ARPES studies of the nematic phase in LaFeAsO. Degeneracy breaking between the d_{xz} and d_{yz} hole bands near the Gamma and M point is observed in the nematic phase. Different temperature dependent band splitting behaviors are observed at the Gamma and M points. The energy of the band splitting near the M point decreases as the temperature decreases while it has little temperature dependence near the Gamma point. The nematic nature of the band shift near the M point is confirmed through a detwin experiment using a piezo device. Since a momentum dependent splitting behavior has been observed in other iron based superconductors, our observation confirms that the behavior is a universal one among iron based superconductors.
Highlights
The nematic phase in iron based superconductors (IBSs) has attracted attention with a notion that it may provide important clue to the superconductivity
Considering all the features of the two Fermi surface maps taken with different polarizations, we determine that the Fermi surface consists of three circular pockets around the Ŵ point and two peanut like pockets around the M point
The discovery of the nematic band shift near M was taken to be an evidence for a Ferro-orbital order which in turn was considered to be the origin of the nematic phase
Summary
The nematic phase in iron based superconductors (IBSs) has attracted attention with a notion that it may provide important clue to the superconductivity. A series of angle-resolved photoemission spectroscopy (ARPES) studies were performed to understand the origin of the nematic phase. Different temperature dependent band splitting behaviors are observed at the Ŵ and M points. In addition to the superconductivity itself, its various phases have attracted much attention due to their possible relation to superconductivity Among these phases, the nematic phase, a rotational symmetry broken state in the electronic structure, has been intensively studied as it occurs in other unconventional superconductors[3]. A number of angle-resolved photoemission spectroscopy (ARPES) experiments have been conducted to investigate the rotational symmetry broken electronic states. Our observation of the momentum dependent nematic band splitting establishes a universal nematic behavior in IBS
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
