標題: Photocreating supercooled spiral-spin states in a multiferroic manganite
作者: Sheu, Y. M.
Ogawa, N.
Kaneko, Y.
Tokura, Y.
電子物理學系
Department of Electrophysics
公開日期: 18-八月-2016
摘要: We demonstrate that the dynamics of the ab-spiral-spin order in a magnetoelectric multiferroic Eu0.55Y0.45MnO3 can be unambiguously probed through optical second harmonic signals, generated via spin-induced ferroelectric polarization. In the case of weak excitation, the ferroelectric and the spiral-spin order remains interlocked, both relaxing through spin-lattice relaxation in the nonequilibrium state. When the additional optical pulse illuminating the sample is intense enough to induce a local phase transition thermally, the system creates ametastable state of the bc-spiral-spin order (with the electric polarization P parallel to c) via supercooling across the first-order phase transition between the ab and bc spiral. The supercooled state of the bc-spiral spin is formed in the thermodynamical ground state of the ab spiral (P parallel to a), displaying a prolonged lifetime with strong dependence on the magnetic field along the a axis. The observed phenomena provide a different paradigm for photoswitching between the two distinct multiferroic states, motivating further research into a direct observation of the photocreated supercooled bc-spiral spin in multiferroic manganites.
URI: http://dx.doi.org/10.1103/PhysRevB.94.081107
http://hdl.handle.net/11536/134084
ISSN: 2469-9950
DOI: 10.1103/PhysRevB.94.081107
期刊: PHYSICAL REVIEW B
Volume: 94
Issue: 8
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