TY - JOUR
T1 - Metallization of molybdenum diselenide under nonhydrostatic compression
AU - Liu, Bao
AU - Gao, Chunxiao
AU - Lin, Lin
AU - Gao, Yang
AU - Ma, Yanzhang
AU - Zhou, Pengyu
AU - Han, Dandan
N1 - Funding Information:
The authors thank scientists at Beamline 4W2 of BSRF for their technical help. This work was supported by the National Natural Science Foundation of China (Grant Nos. 11304034 and 11804047), the Science and Technology Development Program of Jilin City (Grant No. 201831733), and the Development Program of Education Department of Jilin Province (Grant No. JJKH20180425KJ).
Publisher Copyright:
© 2021 American Chemical Society.
PY - 2021/3/11
Y1 - 2021/3/11
N2 - It is known that metallization can greatly facilitate chemical reactions and dramatically change electric transport properties of materials. The search for materials displaying metallization at low pressure is one of the most urgent challenges. In this paper, pressure-induced metallization of molybdenum diselenide (MoSe2) under nonhydrostatic compression has been studied experimentally using Hall effect and X-ray diffraction measurements combined with diamond anvil cell techniques. In situ conductivity and Hall effect measurements under pressure reveal a monotonic decrease of resistivity mostly related to a significant increase of the carrier density by a factor of 4. Above 35.7 GPa, the sample acquires a metallic character with a characteristic increase of the mobility from 9.9 to 16.2 cm2 V-1 s-1 and saturation of the carrier concentration at 5.1 × 1020 cm-3. These results show that the metallization of powder MoSe2 can be initiated by a reduced pressure of 35.7 GPa under nonhydrostatic compression, compared to that above 40 GPa with a single-crystal sample under hydrostatic compression [Nat. Commun. 2015, 6, 7312]. The mechanisms of anisotropic-stress-induced metallization for such reduced initiation pressure have been discussed.
AB - It is known that metallization can greatly facilitate chemical reactions and dramatically change electric transport properties of materials. The search for materials displaying metallization at low pressure is one of the most urgent challenges. In this paper, pressure-induced metallization of molybdenum diselenide (MoSe2) under nonhydrostatic compression has been studied experimentally using Hall effect and X-ray diffraction measurements combined with diamond anvil cell techniques. In situ conductivity and Hall effect measurements under pressure reveal a monotonic decrease of resistivity mostly related to a significant increase of the carrier density by a factor of 4. Above 35.7 GPa, the sample acquires a metallic character with a characteristic increase of the mobility from 9.9 to 16.2 cm2 V-1 s-1 and saturation of the carrier concentration at 5.1 × 1020 cm-3. These results show that the metallization of powder MoSe2 can be initiated by a reduced pressure of 35.7 GPa under nonhydrostatic compression, compared to that above 40 GPa with a single-crystal sample under hydrostatic compression [Nat. Commun. 2015, 6, 7312]. The mechanisms of anisotropic-stress-induced metallization for such reduced initiation pressure have been discussed.
UR - http://www.scopus.com/inward/record.url?scp=85103384056&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.1c00279
DO - 10.1021/acs.jpcc.1c00279
M3 - Article
AN - SCOPUS:85103384056
VL - 125
SP - 5412
EP - 5416
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 9
ER -