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Temperature- and Magnetic-Field-Tuning of Magnetic Phases in Multiferroic NdFe3(BO3)4
Christie S. Nelson,Leonard N. Bezmaternykh,Irina A. Gudim 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.10
We report the low-temperature coexistence in NdFe3(BO3)4 of an incommensurate magnetic phase with a strained commensurate magnetic phase that is primarily at the surface of the crystal. Increasing the temperature or magnetic field decreases the incommensurability and stabilizes the commensurate magnetic phase above Tic ≈ 14 K or Hic = 0.9 T. A comparison to published studies indicates the onset of longitudinal magnetostriction and electric polarization at the magnetic-fieldinduced transition, which may arise due to a basal plane spin-flop and canting of moments along the field direction.
MOA-2013-BLG-220Lb: MASSIVE PLANETARY COMPANION TO GALACTIC-DISK HOST
Yee, J. C.,Han, C.,Gould, A.,Skowron, J.,Bond, I. A.,Udalski, A.,Hundertmark, M.,Monard, L. A. G.,Porritt, I.,Nelson, P.,Bozza, V.,Albrow, M. D.,Choi, J.-Y.,Christie, G. W.,DePoy, D. L.,Gaudi, B. S.,H IOP Publishing 2014 The Astrophysical journal Vol.790 No.1
<P>We report the discovery of MOA-2013-BLG-220Lb, which has a super-Jupiter mass ratio q = 3.01 +/- 0.02 x 10(-3) relative to its host. The proper motion, mu = 12.5 +/- 1 mas yr(-1), is one of the highest for microlensing planets yet discovered, implying that it will be possible to separately resolve the host within similar to 7 yr. Two separate lines of evidence imply that the planet and host are in the Galactic disk. The planet could have been detected and characterized purely with follow-up data, which has important implications for microlensing surveys, both current and into the Large Synoptic Survey Telescope (LSST) era.</P>