Open Access
Physical Review Letters, volume 122, issue 2, publication number 027001
Evidence for Superconductivity above 260 K in Lanthanum Superhydride at Megabar Pressures.
Somayazulu M.
1
,
Ahart M.
1
,
Mishra Ajay Kumar
2
,
Geballe Z. M.
2
,
Baldini Maria
2
,
Meng Yue
3
,
Struzhkin Viktor V.
2
,
1
Institute for Materials Science and Department of Civil and Environmental Engineering, The George Washington University, Washington, DC 20052, USA
|
2
Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA
|
Publication type: Journal Article
Publication date: 2019-01-14
Journal:
Physical Review Letters
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor: 8.6
ISSN: 00319007, 10797114
General Physics and Astronomy
Abstract
Recent predictions and experimental observations of high Tc superconductivity in hydrogen-rich materials at very high pressures are driving the search for superconductivity in the vicinity of room temperature. We have developed a novel preparation technique that is optimally suited for megabar pressure syntheses of superhydrides using pulsed laser heating while maintaining the integrity of sample-probe contacts for electrical transport measurements to 200 GPa. We detail the synthesis and characterization, including four-probe electrical transport measurements, of lanthanum superhydride samples that display a significant drop in resistivity on cooling beginning around 260 K and pressures of 190 GPa. Additional measurements on two additional samples synthesized the same way show resistance drops beginning as high as 280 K at these pressures. The loss of resistance at these high temperatures is not observed in control experiments on pure La as well as in partially transformed samples at these pressures, and x-ray diffraction as a function of temperature on the superhydride reveal no structural changes on cooling. We infer that the resistance drop is a signature of the predicted room-temperature superconductivity in LaH10, in good agreement with density functional structure search and BCS theory calculations.
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Somayazulu M. et al. Evidence for Superconductivity above 260 K in Lanthanum Superhydride at Megabar Pressures. // Physical Review Letters. 2019. Vol. 122. No. 2. 027001
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Somayazulu M., Ahart M., Mishra A. K., Geballe Z. M., Baldini M., Meng Y., Struzhkin V. V., Hemley R. J. Evidence for Superconductivity above 260 K in Lanthanum Superhydride at Megabar Pressures. // Physical Review Letters. 2019. Vol. 122. No. 2. 027001
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TY - JOUR
DO - 10.1103/PhysRevLett.122.027001
UR - https://doi.org/10.1103%2FPhysRevLett.122.027001
TI - Evidence for Superconductivity above 260 K in Lanthanum Superhydride at Megabar Pressures.
T2 - Physical Review Letters
AU - Somayazulu, M.
AU - Ahart, M.
AU - Mishra, Ajay Kumar
AU - Geballe, Z. M.
AU - Baldini, Maria
AU - Meng, Yue
AU - Struzhkin, Viktor V.
AU - Hemley, R. J.
PY - 2019
DA - 2019/01/14 00:00:00
PB - American Physical Society (APS)
IS - 2
VL - 122
SN - 0031-9007
SN - 1079-7114
ER -
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@article{2019_Somayazulu,
author = {M. Somayazulu and M. Ahart and Ajay Kumar Mishra and Z. M. Geballe and Maria Baldini and Yue Meng and Viktor V. Struzhkin and R. J. Hemley},
title = {Evidence for Superconductivity above 260 K in Lanthanum Superhydride at Megabar Pressures.},
journal = {Physical Review Letters},
year = {2019},
volume = {122},
publisher = {American Physical Society (APS)},
month = {jan},
url = {https://doi.org/10.1103%2FPhysRevLett.122.027001},
number = {2},
doi = {10.1103/PhysRevLett.122.027001}
}