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Colossal Magneto-resistance (CMR)
(From P. Schiffer et al. Phys. Rev. Lett. 75, 3336, 1995)
Magnetization, resistivity and magneto-resistance of La.75Ca.25MnO3 vs temperature at various magnetic fields.
FM to PI transition as T increases past a
Tc ~ 230 K
Magneto-resistance is about 1000 times larger than that seen in normal metals !