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Three-dimensional electronic structure of the nematic and antiferromagnetic phases of NaFeAs from detwinned angle-resolved photoemission spectroscopyстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Watson Matthew D., Aswartham Saicharan, Rhodes Luke C., Parrett Benjamin, Iwasawa Hideaki, Hoesch Moritz, Morozov Igor, Buechner Bernd, Kim Timur K.
- Журнал: Physical Review B
- Том: 97
- Номер: 3
- Год издания: 2018
- Издательство: American Physical Society
- Местоположение издательства: United States
- DOI: 10.1103/PhysRevB.97.035134
- Аннотация: We report a comprehensive angle-resolved photoemission spectroscopy study of NaFeAs, a prototypical parent compound of the Fe-based superconductors. Bymechanically detwinning the samples, we show that in the nematic phase (below the structural transition at T-s = 54 K but above the antiferromagnetic transition at T-N = 43 K) spectral weight is detected on only the elliptical electron pocket along the longer alpha(orth) axis. This dramatic anisotropy is likely to arise as a result of coupling to a fluctuating antiferromagnetic order in the nematic phase. In the long-range ordered antiferromagnetic state below T-N, this single electron pocket is backfolded and hybridizes with the hole bands, leading to the reconstructed Fermi surface. By careful analysis of the k(z) variation, we show that the backfolding of spectral weight in the magnetic phase has a wave vector of (pi, 0, pi), with the c-axis component being in agreement with the magnetic ordering in NaFeAs observed by neutron scattering. Our results clarify the origin of the tiny Fermi surfaces of NaFeAs at low temperatures and highlight the importance of the three-dimensional aspects of the electronic and magnetic properties of Fe-based superconductors.
- Добавил в систему: Морозов Игорь Викторович