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Successive destruction of charge density wave states by pressure in LaAgSb2
- Source :
- Physical Review B. 103:085134
- Publication Year :
- 2021
- Publisher :
- American Physical Society, 2021.
-
Abstract
- We comprehensively studied the magnetotransport properties of LaAgSb$_2$ under high pressure up to 4 GPa, which showed unique successive charge density wave (CDW) transitions at $T_{CDW1}\sim 210$ K and $T_{CDW2}\sim 190$ K at ambient pressure. With the application of pressure, both $T_{CDW1}$ and $T_{CDW2}$ were suppressed and disappeared at the critical pressures of $P_{CDW1}=3.0$--3.4 GPa and $P_{CDW2}=1.5$--1.9 GPa, respectively. At $P_{CDW1}$, the Hall conductivity showed a step-like increase, which is consistently understood by the emergence of two-dimensional hollow Fermi surface at $P_{CDW1}$. We also observed a significant negative magnetoresistance effect when the magnetic field and current were applied parallel to the $c$ axis. Shubnikov--de Haas (SdH) oscillation measurements under pressure directly showed the changes in the Fermi surface across the CDW phase boundaries. In $PP_{CDW1}$, we observed a single frequency of $\sim 48$ T with a cyclotron effective mass of 0.066 $m_0$, 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 $\sim 9.2$ T, which is significantly enhanced in the limited pressure range of $P_{CDW2}<br />Comment: 15pages, 13 figures
- Subjects :
- Materials science
Condensed matter physics
Magnetoresistance
Strongly Correlated Electrons (cond-mat.str-el)
Oscillation
FOS: Physical sciences
Fermi surface
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Brillouin zone
Condensed Matter - Strongly Correlated Electrons
Effective mass (solid-state physics)
Amplitude
0103 physical sciences
010306 general physics
0210 nano-technology
Charge density wave
Ambient pressure
Subjects
Details
- Language :
- English
- ISSN :
- 24699950
- Volume :
- 103
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi.dedup.....e1f5201a047e3d57c44d33cbe592119d