Orbital ordering as the determinant for ferromagnetism in biferroic BiMnO3

A. Moreira dos Santos, A. K. Cheetham, T. Atou, Y. Syono, Y. Yamaguchi, K. Ohoyama, H. Chiba, C. N.R. Rao

研究成果: Article査読

225 被引用数 (Scopus)


The ferromagnetic structure of BiMnO3, Tc = 105 K, has been determined from powder neutron-diffraction data collected at 20 K on a sample synthesized at high pressures using a cubic anvil press. BiMnO3 is a distorted perovskite that crystallizes in the monoclinic space group C2 with unit-cell parameters a = 9.5317(7) Å, b = 5.6047(4) Å, c = 9.8492(7) Å, and β = 110.60(1)° (Rp = 6.78%, wRp = 8.53%, reduced X2 = 1.107). Data analysis reveals a collinear ferromagnetic structure with the spin direction along [010] and a magnetic moment of 3.2μB. There is no crystallographic phase transition on cooling the polar room-temperature structure to 20 K, lending support to the belief that ferromagnetism and ferroelectricity coexist in BiMnO3. Careful examination of the six unique Mn-O-Mn superexchange pathways between the three crystallographically independent Mn3+ sites shows that four are ferromagnetic and two are antiferromagnetic, thereby confirming that the ferromagnetism of BiMnO3 stems directly from orbital ordering.

ジャーナルPhysical Review B - Condensed Matter and Materials Physics
出版ステータスPublished - 2002 8月 1

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学


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