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The off-axis pyroelectric effect observed for lithium tetraborate |
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| Authors: | I Ketsman Jie Xiao YaV Burak A Sokolov J McClory |
| Institution: | a Dept. of Physics and Astronomy and the Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, PO Box 880111, Lincoln, NE 68588-0111, USA b Air Force Institute of Technology, 2950 Hobson Way, Wright Patterson Air Force Base, OH 45433-7765, USA c J. Bennett Johnston Sr. Center for Advanced Microstructures and Devices, Louisiana State University, 6980 Jefferson Highway, Baton Rouge, LA 70806, USA d Institute of Physical Optics, 23 Dragomanov Street, Lviv 79005, Ukraine |
| Abstract: | We find a pyroelectric current along the 〈110〉 direction of stoichiometric Li2B4O7 so that the pyroelectric coefficient is nonzero but roughly 10−3 smaller than along the 〈001〉 direction of spontaneous polarization. Abrupt decreases in the pyroelectric coefficient along the 〈110〉 direction can be correlated with anomalies in the elastic stiffness  contributing to concept that the pyroelectric coefficient is not simply a vector but has qualities of a tensor, as expected. The time dependent surface photovoltaic charging suggests that an inverse piezoelectric effect occurs at the (110) surface but not the (100) surface. Both effects along the 〈110〉 direction or at the (110) surface are distinct the conventional as a bulk pyroelectric effect. |
| Keywords: | Pyroelectric effect Lithium tetraborate Coupled order parameters |
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