Abstract
Magnetic Compton scattering at high pressure is presented for the first time. To study the pressure-induced magnetic transition in Laves-phase ErCo 2 , Er 4 f and Co 3 d spin magnetic moments, together with the conduction electron component, were separately and quantitatively estimated at pressures up to 1.84 GPa. The Co 3 d spin moments show a remarkable reduction with increasing pressure, which is in contrast to the weak pressure variation of the Er 4 f spin moment. The relationship between the magnetic transition and instability of the Co 3 d moment at high pressure is discussed from the viewpoint of lattice contraction and the molecular field of Er 4 f moments.
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