Journal
PHYSICAL REVIEW B
Volume 74, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.74.045113
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We measured the magneto-optical response of (La0.4Pr0.6)(1.2)Sr1.8Mn2O7 in order to investigate the microscopic aspects of the magnetic-field-driven spin-glass-insulator to ferromagnetic-metal transition. Application of a magnetic field recovers the ferromagnetic state with an overall redshift of the electronic structure, growth of the bound carrier localization associated with ferromagnetic domains, development of a pseudogap, and softening of the Mn-O stretching and bending modes. We discuss field- and temperature-induced trends within the framework of the Tomioka-Tokura global electronic phase diagram picture and suggest that controlled disorder near a phase boundary can be used to tune the magnetodielectric response. Remnants of the spin-glass-insulator to ferromagnetic-metal transition can also drive 300 K color changes in (La0.4Pr0.6)(1.2)Sr1.8Mn2O7.
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