Measurement of flavor asymmetry of the light-quark sea in the proton with Drell-Yan dimuon production in p + p and p + d collisions at 120 GeV
Not Available
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Engineering topics
Wang, S. G.
Publications and source records attributed to Wang, S. G..
Structural features associated with multiferroic behavior in the RX[subscript 3](BO[subscript 3])[subscript 4] system
Abstract not provided
Zhang, H.↗
Nature of the structural symmetries associated with hybrid improper ferroelectricity in C a 3 X 2 O 7 ( X = Mn and Ti )
In hybrid improper ferroelectric systems, polarization arises from the onset of successive nonpolar lattice modes. Here, measurements and modeling were performed to determine the spatial symmetries of the phases involved in the transitions to these modes. Structural and optical measurements reveal that the tilt and rotation distortions of the MnO 6 or TiO 6 polyhedra relative to the high symmetry phases driving ferroelectricity in the hybrid improper Ca 3 X 2 O 7 system (X = Mn and Ti) condense at different temperatures. The tilt angle vanishes abruptly at T T ~ 400 K for Ca 3 Mn 2 O 7 (and continuously for X = Ti ) and the rotation mode amplitude is suppressed at much higher temperatures T R ~ 1060 K. Moreover, Raman measurements in Ca 3 Mn 2 O 7 under isotropic pressure reveal that the polyhedral tilts can be suppressed by very low pressures (between 1.4 and 2.3 GPa) indicating their softness. These results suggest that the Ca 3 Mn 2 O 7 system provides a platform for strain engineering of ferroelectric properties in film-based systems with substrate-induced strain.
36 MATERIALS SCIENCE↗