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Kajimoto, Ryoichi; Mochizuki, Hidenori*; Yoshizawa, Hideki*; Shintani, Hiroshi*; Kimura, Tsuyoshi*; Tokura, Yoshinori*
Journal of the Physical Society of Japan, 74(9), p.2430 - 2433, 2005/09
Times Cited Count:39 Percentile:79.79(Physics, Multidisciplinary)Magnon excitations have been investigated for PrMnO showing the
-type antiferromagnetic ordering and TbMnO
forming a long-period spin ordering by inelastic neutron scattering. Combined with a result of LaMnO
[K.~Hirota
], the systematic data revealed that the ferromagnetic exchange interaction between nearest-neighbor (NN) Mn sites within the
plane drastically decreases in
MnO
as the ionic radius of
is reduced. In addition, finite next-nearest-neighbor (NNN) coupling is evident in TbMnO
. In contrast, the exchange interaction along the
axis shows much weaker
dependence consistent with the Mn-O-Mn bond angle. These observations confirm a scenario that explains the evolution of spin structures in
MnO
in terms of the competition between the NN and NNN interactions [T.Kimura
].
Kajimoto, Ryoichi; Mitsui, Yukari*; Yoshizawa, Hideki*; Aso, Naofumi*; Shintani, Hiroshi*; Kimura, Tsuyoshi*; Tokura, Yoshinori*
no journal, ,
no abstracts in English