2006
DOI: 10.1103/physrevb.74.045113
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Magneto-optical investigation of the field-induced spin-glass-insulator to ferromagnetic-metal transition in the bilayer manganite(La0.4Pr0.6)1.2et al.

Abstract: Magneto-optical investigation of the field-induced spin-glass insulator to ferromagnetic metallic transition of the bilayer manganite (La 0.4 We measured the magneto-optical response of (La0.4Pr0.6)1.2Sr1.8Mn2O7 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 associat… Show more

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Cited by 14 publications
(17 citation statements)
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“…A slight anomaly was observed in both the temperature dependence of the elastic constant and magnetization curve at T * . It is interesting to compare the magnetic properties of the compounds ͑La 1−z Nd z ͒ 22 The measurements did not show any metallic behavior even for magnetic fields up to 10 T in the ferromagnetic metallic state, but, instead, a far-infrared bound carrier excitation was inferred.…”
Section: ͪ ͑3͒mentioning
confidence: 99%
“…A slight anomaly was observed in both the temperature dependence of the elastic constant and magnetization curve at T * . It is interesting to compare the magnetic properties of the compounds ͑La 1−z Nd z ͒ 22 The measurements did not show any metallic behavior even for magnetic fields up to 10 T in the ferromagnetic metallic state, but, instead, a far-infrared bound carrier excitation was inferred.…”
Section: ͪ ͑3͒mentioning
confidence: 99%
“…When charge and spin degrees of freedom are strongly coupled, it is also sensitive to magnetic excitations and spin ordering transitions. 1,2 Magnetochromism, the modification of a material's optical constants with applied magnetic field, 3,4 is an especially important tool for understanding magnetoelectric and multiferroic materials, 5,6 for which spin-charge interaction is expected to be large.…”
mentioning
confidence: 99%
“…At the same time, the electromagnetic spectrum is very broad, and the dielectric constant ⑀ 1 is a strong function of energy. 19,20 The ferromagnetic metallic state that is suppressed by chemical pressure in ͑La 0.4 Pr 0.6 ͒ 1.2 Sr 1.8 Mn 2 O 7 is recovered under magnetic field. High energy magnetodielectric ͑HEMD͒ contrast was recently observed in several materials including inhomogeneously mixed-valent K 2 V 3 O 8 ͑ϳ5% at 30 T near 1.2 eV͒, kagome staircase compound Ni 3 V 2 O 8 ͑ϳ16% at 30 T near 1.3 eV͒, and hexagonal multiferroic HoMnO 3 ͑ϳ8% at 20 T near 1.8 eV͒.…”
mentioning
confidence: 99%
“…Measurement of the spectroscopic response also provides a way to distinguish between leaky magnetoresistance and true magnetocapacitance because the energies of interest in dielectric spectroscopy are far from the dc limit. 19,20 The parent compound ͑z =0͒ displays a paramagnetic insulator to ferromagnetic metal transition at T c = 120 K. With increasing Pr substitution, T c decreases, and eventually disappears ͑z = 0.6͒, establishing a spin glasslike insulating ground state. This opens the possibility of exploiting changes in ⑀ 1 over a wide energy range, essentially as a multichannel information storage system.…”
mentioning
confidence: 99%
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