Abstract
Strong inelastic scattering of neutrons extends along the first Brillouin zone boundary of FCC structure on Mn 73 Cu 27 alloy at room temperature, indicating that Mn spins fluctuate dynamically with strong spin correlations. The fluctuation is considered to be caused by geometrical spin frustration of the octahedral antiferromagnet and suppresses the magnetic LRO. At low temperature, part of spins freezes due to the randomness of atomic arrangements, resulting in spin-glass-like behavior.
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