Abstract
Magnetovolume effects of 3d heavy-electron compounds with linear spin chains, ( La 1 - x Y x ) Mn 4 Al 8 with x ⩽ 0.15 and = 1 , have been investigated to get information on the ground state of LaMn 4 Al 8 and the nature of spin fluctuations in this system. The negative thermal expansion observed for LaMn 4 Al 8 is suppressed by the substitution of a small amount of Y for La. Together with the field-cooled effect in the susceptibility, the magnetovolume effect suggests the development of short-range magnetic correlation in LaMn 4 Al 8 at low temperatures.
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