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ID 61425
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Akiba, Kazuto Graduate School of Natural Science and Technology, Okayama University ORCID Kaken ID researchmap
Nishimori, Hiroaki Graduate School of Natural Science and Technology, Okayama University
Umeshita, Nobuaki Graduate School of Natural Science and Technology, Okayama University
Kobayashi, Tatsuo C. Graduate School of Natural Science and Technology, Okayama University ORCID Kaken ID publons researchmap
Abstract
We comprehensively studied the magnetotransport properties of LaAgSb2 under high pressure up to 4 GPa, which showed unique successive charge density wave (CDW) transitions at TCDW1∼210 K and TCDW2∼190 K at ambient pressure. With the application of pressure, both TCDW1 and TCDW2 were suppressed and disappeared at the critical pressures of PCDW1=3.0–3.4 GPa and PCDW2=1.5–1.9 GPa, respectively. At PCDW1, the Hall conductivity showed a steplike increase, which is consistently understood by the emergence of a two-dimensional hollow Fermi surface at PCDW1. We also observed a significant negative magnetoresistance effect when the magnetic field and current were applied parallel to the c axis. The negative contribution was observed in the whole pressure region from 0 to 4 GPa. Shubnikov–de Haas (SdH) oscillation measurements under pressure directly showed the changes in the Fermi surface across the CDW phase boundaries. In PPCDW1, we observed a single frequency of ∼48 T with a cyclotron effective mass of 0.066m0, whose cross section in the reciprocal space corresponded to only 0.22% of the first Brillouin zone. Besides, we observed another oscillation component with frequency of ∼9.2 T, which is significantly enhanced in the limited pressure range of PCDW2
Published Date
2021-02-22
Publication Title
Physical Review B
Volume
volume103
Publisher
American Physical Society
Start Page
085134
ISSN
2469-9950
NCID
AA11187113
Content Type
Journal Article
language
英語
OAI-PMH Set
岡山大学
Copyright Holders
©2021 American Physical Society
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DOI
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isVersionOf https://doi.org/10.1103/PhysRevB.103.085134