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We measured the magneto-optical response of(La$_{0.4}$Pr$_{0.6}$)$_{1.2}$Sr$_{1.8}$Mn$_2$O$_7$ in order to investigate themicroscopic aspects of the magnetic field driven spin-glass insulator toferromagnetic metal transition. Application of a magnetic field recovers theferromagnetic 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 bendingmodes that indicate a structural change. We discuss field- andtemperature-induced trends within the framework of the Tomioka-Tokura globalelectronic phase diagram picture and suggest that controlled disorder near aphase boundary can be used to tune the magnetodielectric response. Remnants ofthe spin-glass insulator to ferromagnetic metallic transition can also drive300 K color changes in (La$_{0.4}$Pr$_{0.6}$)$_{1.2}$Sr$_{1.8}$Mn$_2$O$_7$.Comment: 9 pages, 8 figure

physical review. b, condensed matter and materials physics

Magneto-optical investigation of the field-induced spin-glass-insulator to ferromagnetic-metal transition in the bilayer manganite<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:msub><mml:mi mathvariant="normal">La</mml:mi><mml:mn>0.4</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Pr</mml:mi><mml:mn>0.6</mml:mn></mml:msub><mml:mo>)</mml:mo></mml:mrow><mml:mn>1.2</mml:mn></mml:msub><mml:msub><mml:mi …

Magneto-optical investigation of the field-induced spin-glass-insulator to ferromagnetic-metal transition in the bilayer manganite(La0.4Pr0.6)1.2