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Optical Properties and Magnetic Field-Induced Phase Transitions in the Ferroelectric State of Ni$_3$V$_2$O$_8$

Autor: Rai, R. C., Cao, J., Brown, S., Musfeldt, J. L., Kasinathan, D., Singh, D. J., Lawes, G., Rogado, N., Cava, R. J., Wei, X.

We use a combination of optical spectra, first principles calculations, and energy dependent magneto-optical measurements to elucidate the electronic structure and to study the phase diagram of Ni$_3$V$_2$O$_8$. We find a remarkable interplay of magn

Externí odkaz: http://arxiv.org/abs/cond-mat/0610835

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Observation of 300 K High Energy MagnetoDielectric Response in the Bilayer Manganite (La$_{0.4}$Pr$_{0.6}$)$_{1.2}$Sr$_{1.8}$Mn$_2$O$_7$

Autor: Cao, J., Rai, R. C., Brown, S., Musfeldt, J. L., Tackett, R., Lawes, G., Wei, X., Wang, Y. J., Apostu, M., Suryanarayanan, R., Revcolevschi, A.

We observed a large HEMD effect in the bilayer manganite (La$_{0.4}$Pr$_{0.6}$)$_{1.2}$Sr$_{1.8}$Mn$_2$O$_7$, a direct consequence of field driven spin-glass insulator to ferromagnetic metal transition. The remnants of the transition can be used to a

Externí odkaz: http://arxiv.org/abs/cond-mat/0610812

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Magneto-optical investigation of the field-induced spin-glass insulator to ferromagnetic metallic transition of the bilayer manganite (La$_{0.4}$Pr$_{0.6}$)$_{1.2}$Sr$_{1.8}$Mn$_2$O$_7$

Autor: Cao, J., Haraldsen, J. T., Rai, R. C., Brown, S., Musfeldt, J. L., Wang, Y. J., Wei, X., Apostu, M., Suryanarayanan, R., Revcolevschi, A.

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 the microscopic aspects of the magnetic field driven spin-glass insulator to ferromagnetic metal transition. Application of a magn

Externí odkaz: http://arxiv.org/abs/cond-mat/0606339

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Magneto-Dielectric Effect in the S = 1/2 Quasi-Two Dimensional Antiferromagnet K2V3O8

Autor: Rai, R. C., Cao, J., Musfeldt, J. L., Singh, D. J., Jin, R., Zhou, Z. X., Sales, B. C., Mandrus, D., Wei, X.

We report the optical and magneto-optical properties of K2V3O8, an S=1/2 quasi-two-dimensional Heisenberg antiferromagnet. Local spin density approximation electronic structure calculations are used to assign the observed excitations and analyze the

Externí odkaz: http://arxiv.org/abs/cond-mat/0512506

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Dynamics of the Electro-Reflective Response of TaS3

Autor: Rai, R. C., Brill, J. W.

We have observed a large (~1%) change in infrared reflectance of the charge-density-wave (CDW) conductor, orthorhombic TaS3, when its CDW is depinned. The change is concentrated near one current contact. Assuming that the change in reflectance is pro

Externí odkaz: http://arxiv.org/abs/cond-mat/0404690

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Field-tuned Collapse of an Orbital Ordered and Spin-polarized State: Colossal Magnetoresistance in Bilayered Ruthenate

Autor: Cao, G., Balicas, L., Lin, X. N., Chikara, S., Duairaj, V., Elhami, E., Brill, J. W., Rai, R. C.

Ca3Ru2O7 with a Mott-like transition at 48 K features different in-plane anisotropies of magnetization and magnetoresistance. Applying magnetic field along the magnetic easy-axis precipitates a spin-polarized state via a first-order metamagnetic tran

Externí odkaz: http://arxiv.org/abs/cond-mat/0307068

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Electro-Reflectance Spectra of Blue Bronze

Autor: Rai, R. C., Bondarenko, V. A., Brill, J. W.

We show that the infrared reflectance of the quasi-one dimensional charge-density-wave (CDW) conductor K0.3MoO3 (blue bronze) varies with position when a voltage greater than the CDW depinning threshold is applied. The spatial dependence and spectra

Externí odkaz: http://arxiv.org/abs/cond-mat/0307075

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