Randy Scott Fishman

Magnetic dispersion and anisotropy in multiferroic BiFeO3

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Long-Range Magnetic Interactions in the Multiferroic Antiferromagnet MnWO4

crystallizes in the pyrochlore structure and undergoes a metal-insulator transition (MIT) near 226 K. We have characterized the MIT in

Magnetic interactions in the geometrically frustrated triangular lattice antiferromagnet CuFeO2.

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Magnetic excitations in the geometric frustrated multiferroic CuCrO2

using x-ray diffraction, resistivity at ambient and high pressure, specific heat, magnetization, thermopower, Hall coefficient, and thermal conductivity. Both single crystals and polycrystalline material were examined. The MIT is accompanied by no change in crystal symmetry and a change in unit-cell volume of less than 0.05%. The resistivity shows little temperature dependence above 226 K, but increases by 3 orders of magnitude as the sample is cooled to 4 K. The specific heat anomaly resembles a mean-field transition and shows no hysteresis or latent heat.

Spin rotation technique for non-collinear magnetic systems: application to the generalized Villain model

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Optical Diode Effect at Spin-Wave Excitations of the Room-Temperature Multiferroic BiFeO_{3}.

orders magnetically at the MIT. The magnetization data are consistent with antiferromagnetic order, with a small parasitic ferromagnetic component. The Hall and Seebeck coefficients are consistent with a semiconducting gap opening at the Fermi energy at the MIT. We have also performed electronic structure calculations on

Terahertz spectroscopy of spin waves in multiferroic BiFeO3 in high magnetic fields.

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Spin state and spectroscopic modes of multiferroic BiFeO3

These calculations indicate that

Magnetic Compensation and Ordering in the Bimetallic Oxalates: Why Are the 2D and 3D Series so Different?

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