Spin-fracton effects in dilute amorphous alloys

M. B. Salamon, Y. Yeshurun

Research output: Contribution to journalArticlepeer-review

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Abstract

Deviations from the Bloch T32 law, observed in dilute amorphous magnets, are shown to result from the crossover from magnon to fracton density of states. Data from a series of amorphous (CopNi1-p)75P16B6Al3 alloys were fitted to an approximate density-of-states function that matches the two regimes at a frequency c(p). Both the magnon stiffness constant and c decrease as powers of p-pc, where pc is the percolation concentration. The exponents are consistent with a value of =1.5 used in the fraction density of states and in agreement with percolation theory.

Original languageEnglish
Pages (from-to)5643-5646
Number of pages4
JournalPhysical Review B
Volume36
Issue number10
DOIs
StatePublished - 1987

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