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CuInP<sub>2</sub>S<sub>6</sub> Room Temperature Layered Ferroelectric [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Basic Energy Sciences, 2015.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
pages 3,808-3,814 : digital, PDF file
Additional Creators
Oak Ridge National Laboratory, United States. Department of Energy. Office of Basic Energy Sciences, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
In this paper, we explore ferroelectric properties of cleaved 2-D flakes of copper indium thiophosphate, CuInP2S6 (CITP), and probe size effects along with limits of ferroelectric phase stability, by ambient and ultra high vacuum scanning probe microscopy. CITP belongs to the only material family known to display ferroelectric polarization in a van der Waals, layered crystal at room temperature and above. Our measurements directly reveal stable, ferroelectric polarization as evidenced by domain structures, switchable polarization, and hysteresis loops. We found that at room temperature the domain structure of flakes thicker than 100 nm is similar to the cleaved bulk surfaces, whereas below 50 nm polarization disappears. We ascribe this behavior to a well-known instability of polarization due to depolarization field. Furthermore, polarization switching at high bias is also associated with ionic mobility, as evidenced both by macroscopic measurements and by formation of surface damage under the tip at a bias of 4 V—likely due to copper reduction. Mobile Cu ions may therefore also contribute to internal screening mechanisms. Finally, the existence of stable polarization in a van-der-Waals crystal naturally points toward new strategies for ultimate scaling of polar materials, quasi-2D, and single-layer materials with advanced and nonlinear dielectric properties that are presently not found in any members of the growing “graphene family”.
Report Numbers
E 1.99:1265589
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
05/01/2015.
"KC0403040"
"KC0201010"
"ERKCZ01"
"ERKCZ07"
Nano Letters 15 6 ISSN 1530-6984 AM
Alex Belianinov; Qian He; Andrius Dziaugys; Petro Maksymovych; Eugene Eliseev; Albina Y. Borisevich; Anna N. Morozovska; Juras Banys; Yulian Vysochanskii; Sergei V. Kalinin.
Funding Information
AC05-00OR22725
View MARC record | catkey: 24046829