Physical Review B, volume 102, issue 13, publication number 134510
Superconductivity and equation of state of lanthanum at megabar pressures
Wuhao Chen
1
,
Dmitrii V Semenok
2
,
Ivan A. Troyan
3
,
Anna G. Ivanova
3
,
Anna Ivanova
3
,
Xiaoli Huang
1
,
Artem R. Oganov
2
,
Cui Tian
1, 4
3
Publication type: Journal Article
Publication date: 2020-10-26
Journal:
Physical Review B
Quartile SCImago
Q1
Quartile WOS
Q2
Impact factor: 3.7
ISSN: 24699950, 24699969, 10980121, 1550235X
Abstract
Lanthanum (La) is the first member of the lanthanoid that has recently raised considerable interest because of its unique La superhydride ${\mathrm{LaH}}_{10}$ and its own superconducting properties. There has been a lack of experimental evidence for the equation of state (EOS) and superconductivity of La at pressures exceeding one megabar. Here, we extend the pressure range up to 140 GPa to explore the EOS and superconductivity of La via the electrical resistance and x-ray diffraction measurements. We identified the phase transition sequences by the La Bail refinements of the experimental XRD patterns and discovered a distorted fcc-La phase (space group Fmmm) above 78 GPa with nonhydrostatic pressure transmitting media. All the experimental pressure-volume data were fitted by the third-order Birch-Murnaghan equation: ${V}_{0}=37.5\phantom{\rule{0.16em}{0ex}}{\AA{}}^{3}, {B}_{0}=14.5\phantom{\rule{0.16em}{0ex}}(1)\phantom{\rule{0.16em}{0ex}}\mathrm{GPa}$, and ${B}_{0}^{\ensuremath{'}}=5$. Superconductivity still existed in the distorted fcc-La with an onset critical temperature ${T}_{c}$ of 9.6 K at 78 GPa, which decreases to 2.2 K at 140 GPa. We calculated the superconducting parameters of La at several pressure points, and discussed the difference from experimetal ${T}_{c}$.
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Chen W. et al. Superconductivity and equation of state of lanthanum at megabar pressures // Physical Review B. 2020. Vol. 102. No. 13. 134510
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Chen W., Semenok D. V., Semenok D. V., Troyan I. A., Ivanova A. G., Ivanova A., Huang X., Oganov A. R., Tian C. Superconductivity and equation of state of lanthanum at megabar pressures // Physical Review B. 2020. Vol. 102. No. 13. 134510
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TY - JOUR
DO - 10.1103/PhysRevB.102.134510
UR - https://doi.org/10.1103/PhysRevB.102.134510
TI - Superconductivity and equation of state of lanthanum at megabar pressures
T2 - Physical Review B
AU - Chen, Wuhao
AU - Oganov, Artem R.
AU - Semenok, Dmitrii V
AU - Huang, Xiaoli
AU - Troyan, Ivan A.
AU - Ivanova, Anna G.
AU - Tian, Cui
AU - Semenok, Dmitry V.
AU - Ivanova, Anna
PY - 2020
DA - 2020/10/26 00:00:00
PB - American Physical Society (APS)
IS - 13
VL - 102
SN - 2469-9950
SN - 2469-9969
SN - 1098-0121
SN - 1550-235X
ER -
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@article{2020_Chen,
author = {Wuhao Chen and Artem R. Oganov and Dmitrii V Semenok and Xiaoli Huang and Ivan A. Troyan and Anna G. Ivanova and Cui Tian and Dmitry V. Semenok and Anna Ivanova},
title = {Superconductivity and equation of state of lanthanum at megabar pressures},
journal = {Physical Review B},
year = {2020},
volume = {102},
publisher = {American Physical Society (APS)},
month = {oct},
url = {https://doi.org/10.1103/PhysRevB.102.134510},
number = {13},
doi = {10.1103/PhysRevB.102.134510}
}