Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session C71: Poster Session I (2:00pm - 5:00pm)
2:00 PM,
Monday, March 2, 2020
Room: Exhibit Hall C/D
Abstract: C71.00353 : Electrical and optical properties of tetragonal polymeric C60 under high pressure
View Presentation Abstract
Presenter:
Zhongyan Wu
(Department of Physics and HYU-HPSTAR-CIS High Pressure Research Center, Hanyang University, Seoul, 04763, South Korea)
Authors:
Zhongyan Wu
(Department of Physics and HYU-HPSTAR-CIS High Pressure Research Center, Hanyang University, Seoul, 04763, South Korea)
Lin Wang
(Center for High Pressure Science & Technology Advanced Research, Shanghai 201203, China)
Alexander Soldatov
(Department of Engineering Sciences & Mathematics, Lulea University of Technology, SE - 97187 Lulea, Sweden)
Jaeyong Kim
(Department of Physics and HYU-HPSTAR-CIS High Pressure Research Center, Hanyang University, Seoul, 04763, South Korea)
The electrical resistance value, R, decreased from 1010 to 5×105 Ω as a result of pressure cycling (with ramp pressure increase in each cycle) to a maximum pressure of 32 GPa by using a diamond anvil cell (DAC). A substantial drop in R after decompression (~1010 Ω) was reached in a cycle with a ramp pressure of 22 GPa that we consider as a cross-over/phase transition p. A subsequent p-cycling to 32 GPa resulted in further (20 times!) drop in the R of the recovered sample and exhibited anomalies in R vs p behavior.
The results of Raman measured after decompression showed that the ratio of the 2-dimensional T-phase to 1-dimensional O-phase decreased as increasing the cycling p. Raman-mapping of the recovered material showed Raman spectra inhomogeneities across the sample stemming from a non-hydrostatic pressure distribution in the DAC and the relationship between shear and normal stress.
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