In Eu5Sn2As6, magnetic field enhances phonon thermal conductivity by lifting spin degeneracy, suppressing exchange-frustrated scattering and thereby driving colossal magnetoresistance.
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Colossal Magnetoresistance and Phonon Driven Exchange Dynamics in Eu$_5$Sn$_2$As$_6$
In Eu5Sn2As6, magnetic field enhances phonon thermal conductivity by lifting spin degeneracy, suppressing exchange-frustrated scattering and thereby driving colossal magnetoresistance.