Feb 02, 2016

「Overview of two multiferroic systems: RMnO3 and BiFeO3」
Je-Geun Park 氏


講演題目: Overview of two multiferroic systems: RMnO3 and BiFeO3
講 師 : Je-Geun Park 博士
     Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul National University
日 時 : 平成28年2月2日 (火) 16:30-18:00
場 所 : 北海道大学 理学部5号館 (5-205室)

要 旨 :
Multiferroic materials that have the coexistence of both magnetic and ferroelectric ground states have drawn significant attention in materials science over the past ten years or so. The underlying origin of this unusual behavior in either naturally occurring materials or artificially synthesized thin films has been a strong enough motivation for material scientists to discover or rediscover new multiferroic materials. Among a long list of multiferroic materials, hexagonal manganites RMnO3 and BiFeO3 are arguably two most interesting multiferroic materials. In particular, BiFeO3 has been extensively investigated for potential applications by virtue of its magnetic and ferroelectric transitions occurring above room temperature: TN=650 K and TC=1050 K. Moreover, it has a very interesting incommensurate magnetic phase transition with an extremely long period of 650 A. On the other hand, the hexagonal manganite materials exhibit a natural two-dimensional triangular lattice, which provide an interesting platform to investigate low dimensional magnetism with a supposedly strong coupling to the ferroelectric order parameter. Over the past few years or so, there have been a multitude of studies done on both compounds. Largely thanks to these extensive studies, we have now come to know extremely details about the physical properties of the two materials. In this talk, I will present our results obtained from high resolution neutron scattering experiments on these two fascinating materials. [1] Seongsu Lee, et al., Nature 451, 805 (2008) [2] Jaehong Jeong, et al., Phys. Rev. Lett. 108, 077202 (2012) [3] Joosung Oh, et al., Phys. Rev. Lett. 111, 257202 (2013) [4] Jaehong Jeong, et al., Phys. Rev. Lett. 113, 107202 (2014) [5] [Topical Review] Je-Geun Park, et al., J. Phys.: Condens. Matter 26, 433202 (2014) [6] [Invited feature article] Hasung Sim, Joosung Oh, Jaehong, Jeong, Manh Duc Le, and Je-Geun Park, Acta. Crystallog. B (in press): arXiv:1511.04181

世話人  網塚浩
北海道大学理学部物理学科 (電話011-706-3484)

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