Reinvestigation of Magnetic Structures for the Thermally Induced States of CuFe1-xAlxO2(x=0.00, 0.02 and 0.05) Using a Four-Circle Neutron Diffractometer
作者： Noriki Terada , Takeshi Kawasaki , Setsuo Mitsuda , Hiroyuki Kimura , Yukio Noda
DOI: 10.1143/JPSJ.74.1561
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摘要: We have reinvestigated the effect of non-magnetic impurity on thermally-induced magnetic orderings in geometrically frustrated triangular lattice antiferromagnets CuFe 1- x Al O 2 with =0.00, 0.02 and 0.05, using a four-circle neutron diffractometer. Although we inferred our previous work three-axis diffractometer that proper screw type structure is realized intermediate-temperature (IM) phase samples =0.02 =0.05, present found sinusoidally amplitude-modulated moments canted by about 50° from c axis toward hexagonal direction realized. These experimental findings suggest quasi-Ising CuFeO are stabilized not strong Ising anisotropy expected Ising-like successive transitions but small added to strongly competing exchange interactions.
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