Informace o publikaci
Infrared Study of the Spin Reorientation Transition and Its Reversal in the Superconducting State in Underdoped Ba1-xKxFe2As2
| Autoři | |
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| Rok publikování | 2015 |
| Druh | Článek v odborném periodiku |
| Časopis / Zdroj | PHYSICAL REVIEW LETTERS |
| Fakulta / Pracoviště MU | |
| Citace | |
| www | http://journals.aps.org/prl/pdf/10.1103/PhysRevLett.115.027003 |
| Doi | http://dx.doi.org/10.1103/PhysRevLett.115.027003 |
| Obor | Fyzika pevných látek a magnetismus |
| Klíčová slova | Iron-based superconductors |
| Popis | With infrared spectroscopy we investigated the spin-reorientation transition from an orthorhombic antiferromagnetic (o-AF) to a tetragonal AF (t-AF) phase and the reentrance of the o-AF phase in the superconducting state of underdoped Ba1-xKxFe2As2. In agreement with the predicted transition from a single-Q to a double-Q AF structure, we found that a distinct spin density wave develops in the t-AF phase. The pair breaking peak of this spin density wave acquires much more low-energy spectral weight than the one in the o-AF state which indicates that it competes more strongly with superconductivity. We also observed additional phonon modes in the t-AF phase which likely arise from a Brillouin-zone folding that is induced by the double-Q magnetic structure with two Fe sublattices exhibiting different magnitudes of the magnetic moment. |
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