7,285 research outputs found

    Room temperature multiferroicity in orthorhombic LuFeO3_3

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    From the measurement of dielectric, ferroelectric, and magnetic properties we observe simultaneous ferroelectric and magnetic transitions around \sim600 K in orthorhombic LuFeO3_3. We also observe suppression of the remanent polarization by \sim95\% under a magnetic field of \sim15 kOe at room temperature. The extent of suppression of the polarization under magnetic field increases monotonically with the field. These results show that even the orthorhombic LuFeO3_3 is a room temperature multiferroic of type-II variety exhibiting quite a strong coupling between magnetization and polarization.Comment: 5 pages with 5 figures; published in Appl. Phys. Let

    Solar Neutrino Oscillation Parameters after KamLAND

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    We explore the impact of the data from the KamLAND experiment in constraining neutrino mass and mixing angles involved in solar neutrino oscillations. In particular we discuss the precision with which we can determine the the mass squared difference Δmsolar2\Delta m^2_{solar} and the mixing angle θsolar\theta_{solar} from combined solar and KamLAND data. We show that the precision with which \Delta m^_{solar} can be determined improves drastically with the KamLAND data but the sensitivity of KamLAND to the mixing angle is not as good. We study the effect of enhanced statistics in KamLAND as well as reduced systematics in improving the precision. We also show the effect of the SNO salt data in improving the precision. Finally we discuss how a dedicated reactor experiment with a baseline of 70 km can improve the θsolar\theta_{solar} sensitivity by a large amount.Comment: Talk given at 4th International Conference on Nonaccelerator New Physics (NANP 03), Dubna, Russia, 23-28 Jun 200