Abstract
The compound KCuF 3 is known to form antiferromagnetic quantum linear chains in spite of its pseudo-cubic crystal structure, and type- A collinear magnetic ordering with the spins lying in the c -plane has been accepted so far. However, recent electron paramagnetic resonance studies revealed the existence of the ∑ i > j d i j ·( S i × S j ) interaction with d i j ⊥ c -axis between nearest-neighbour spins along the c -axis, but the direction of d i j in the c -plane is still unknown. To clarify the direction of d i j in the c -plane, antiferromagnetic resonance experiments were conducted at 4.2 K, which is far below T N =39 K, using an X-band spectrometer. Analysis of the resonance field having a fourfold symmetric change in the c -plane revealed that d i j //[100] p which are orthogonal to each other in the c -plane. Owing to these d i j , spins are canted in their directions and are divided into eight sublattices.
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