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← ScienceWhich outcome occurs the moment a crystal exhibits a permanent magnetic dipole?
A)Spontaneous symmetry breaking occurs✓
B)Exciton formation becomes less favourable
C)Increased delocalisation reduces conductivity
D)Resonant acoustic phonon modes dissipate
💡 Explanation
Spontaneous symmetry breaking occurs because spins align below the Curie temperature, forming magnetic domains via the exchange interaction mechanism. Therefore, magnetic ordering initiates, rather than altered quasiparticle behavior or modified phonon spectra.
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