Tetragonal magnetic phase in Ba1-xKxFe2As2 from x-ray and neutron diffraction

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ALLRED J. M. , Avci S. , CHUNG D. Y. , CLAUS H., KHALYAVIN D. D. , MANUEL P., ...More

PHYSICAL REVIEW B, vol.92, no.9, 2015 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 92 Issue: 9
  • Publication Date: 2015
  • Doi Number: 10.1103/physrevb.92.094515
  • Title of Journal : PHYSICAL REVIEW B


Combined neutron and x-ray diffraction experiments demonstrate the formation of a low-temperature minority magnetic tetragonal phase in Ba0.76K0.24Fe2As2 in addition to the majority magnetic, orthorhombic phase. The coincident enhancement in the magnetic (1/2 1/2 1) peaks shows that this minority phase is of the same type that was observed in Ba1-xNaxFe2As2 (0.24 <= x <= 0.28), in which the magnetic moments reorient along the c axis. This is evidence that the tetragonalmagnetic phase is a universal feature of the hole-doped iron-based superconductors. The observations suggest that in this regime the energy levels of the C-2 and C-4 symmetric magnetic phases are very close.