Neutron diffraction experiments on CrAs revealed that the pressure versus t
emperature phase diagram and magnetic structures in the phase diagram are v
ery similar to those of CeP. The difference is critical pressure values P-c
, which are about 0.3 GPa in CeP and about 1.2 GPa in CeAs, and above which
the long period magnetic structures composed of Gamma(7) and Gamma(8) Ce (
0 0 1) planes appear. This is discussed in connection with the difference o
f their carrier numbers and the Gamma(8) P-f mixing effect. (C) 2000 Publis
hed by Elsevier Science B.V. All rights reserved.