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- W2095572801 abstract "The thermal and electrical conductivities of 70-wt%-Ni-30-wt%-Fe, 81-wt%-Ni-19-wt%-Fe, and 67-wt%-Ni-33-wt%-Cu have been measured between 1.5 and 4.5 K, in external fields up to 6 T. Both nickel-iron alloys show a small magnon contribution ${ensuremath{kappa}}_{m}$ to the thermal conduction, equal to about 3% of the total conductivity at 4 K. In 70-wt%-Ni-30-wt%-Fe ${ensuremath{kappa}}_{m}ensuremath{propto}{T}^{1.9}$ is found. Using a simple kinetic-theory model, the magnon lifetime ${ensuremath{tau}}_{m}$ is derived equal to 1.7ifmmodetimeselsetexttimesfi{}${10}^{ensuremath{-}10}$ sec at 4 K and varying as ${T}^{ensuremath{-}0.6}$. This implies ${ensuremath{tau}}_{m}ensuremath{propto}{ensuremath{omega}}^{ensuremath{-}0.6}$. In the zero-magnetostriction alloy 81-wt%-Ni-19-wt%-Fe, ${ensuremath{kappa}}_{m}ensuremath{propto}{T}^{1.5}$ and ${ensuremath{tau}}_{m}ensuremath{propto}{T}^{ensuremath{-}1}ensuremath{propto}{ensuremath{omega}}^{ensuremath{-}1}$ is found to hold. Our lifetime values agree with those derived from magnetic resonance linewidths. The nickel-copper alloy shows no magnon heat transport, implying a magnon lifetime of less than 2ifmmodetimeselsetexttimesfi{}${10}^{ensuremath{-}11}$ sec at 3.55 K. Shorter magnon lifetime in Ni-Cu than in Ni-Fe may reflect faster magnon-electron relaxation, corresponding to increased smearing of the electron momentum gap by alloy disorder. The latter correlates, in turn, with larger electrical resistivity and smaller magnetization." @default.
- W2095572801 created "2016-06-24" @default.
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- W2095572801 date "1972-09-01" @default.
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- W2095572801 title "Magnon Heat Conduction and Magnon Scattering Processes in Fe-Ni Alloys" @default.
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- W2095572801 doi "https://doi.org/10.1103/physrevb.6.1974" @default.
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