期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 27, 期 25, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/27/25/255003
关键词
chromia; magneto-electrics; surface stability; surface Debye temperature; surface to bulk core level shift
资金
- C-SPIN, part of STARnet, a Semiconductor Research Corporation program - MARCO
- DARPA [SRC 2381.001, SRC 2381.003]
- Center for NanoFerroic Devices (CNFD)
- Semiconductor Research Corporation Nanoelectronics Research Initiative (NRI) [SRC 2398.001]
- NSF [DMR-1420645]
- Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy
The surface of chromia (Cr2O3) has a surface electronic structure distinct from the bulk and a packing density distinct from the bulk. More than a demarcation between the solid and the vacuum, the surface differs from the bulk of chromia, not just because of a partial occupancy of chromium sites, but also because of an increased number of unoccupied surface oxygen sites (vacancy sites), evident in angle-resolved core level photoemission. In spite of the structural differences that exist at the surface, there is, as yet, no evidence that these complications affect the surface Debye temperature beyond the most simple of assumptions regarding the lower coordination of the surface. Using low-energy electron diffraction (LEED), the effective surface Debye temperature (similar to 490 K) is found to be lower than the bulk (similar to 645 K) Debye temperature of Cr2O3(0 0 0 1). This surface effective Debye temperature, indicative of vibrations along the surface normal, uncorrected for anharmonic effects, has a value reduced from the effective bulk Debye temperature yet close to the value root 2 expected from a simple mean field argument.
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