A magnetic ferroelectric material, YMn2O5, undergoes several magnetic phase transitions at low temperatures and develops spontaneous electric polarization along the b-axis in a commensurate magnetic phase with a characteristic wave vector of (0.5,0,0.25). We have determined the commensurate spin structure by performing four circle neutron diffraction (FCD) and three-dimensional polarization analysis (CRYOPAD) on a single crystal of YMn2O5. In the spin structure, Mn4+ moments form a transverse (cycloidal) spiral structure along the c-axis that can induce the spontaneous electric polarization along the b-axis.
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Authors
J.-H. Kim
University of Virginia
S.-H. Lee
University of Virginia
S. Wakimoto
JAEA
M. Matsuda
JAEA
H. Kimura
Tohoku University
Y. Noda
Tohoku University
S. Juerg
PSI
M. Kenzelmann
LNS, ETHZ \& PSI, PSI, Switzerland
ETH/PSI
C.F. Majkrzak
NIST
S.-I. Park
KAERI
S. Park
Rutgers University
S.-W. Cheong
Rutgers University
RCEM and Rutgers University, Piscataway, NJ
Rutgers University (Deparment of Physics)
Rutgers Univ.
Department of Physics and Astronomy, Rutgers University
Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
Rutgers Center for Emergent Materials and Department of Physics \& Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
Rutgers Center for Emergent Materials and Department of Physics \& Astronomy, Rutgers University, Piscataway, New Jersey 08854
