Room-temperature superconductivity in boron- and nitrogen-doped lanthanum superhydride
Abstract
Recent theoretical and experimental studies of hydrogen-rich materials at megabar pressures (i.e., >100 GPa) have led to the discovery of very high-temperature superconductivity in these materials. Lanthanum superhydride LaH10 has been of particular focus as the first material to exhibit a superconducting critical temperature (Tc) near room temperature. Experiments indicate that the use of ammonia borane as the hydrogen source can increase the conductivity onset temperatures of lanthanum superhydride to as high as 290 K. In this work, we examine the doping effects of B and N atoms on the superconductivity of LaH10 in its fcc ($$Fm\bar{3}m$$) clathrate structure at megabar pressures. Doping at H atomic positions strengthens the H32 cages of the structure to give higher phonon frequencies that enhance the Debye frequency and thus the calculated Tc. The predicted Tc can reach 288 K in LaH9.985N0.015 within the average high-symmetry structure at 240 GPa. The remarkably large shift in Tc to higher values produced by small degrees of chemical doping opens the prospect for the creation of still higher-temperature superconductivity in superhydrides potentially at even lower-pressure conditions.
- Authors:
-
[1];
[2];
[3]
- Yanshan Univ., Qinhuangdao (China)
- Univ. of Texas at Dallas, Richardson, TX (United States)
- Univ. of Illinois, Chicago, IL (United States)
- Publication Date:
- Research Org.:
- Univ. of Illinois, Chicago, IL (United States)
- Sponsoring Org.:
- USDOE; National Science Foundation (NSF); National Natural Science Foundation of China (NSFC); Hebei Educational Department of China
- OSTI Identifier:
- 1835885
- Grant/Contract Number:
- NA0003975; SC0020340; DMR-1933622; QN2018012; 11904312
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 104; Journal Issue: 21; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Ge, Yanfeng, Zhang, Fan, and Hemley, Russell J. Room-temperature superconductivity in boron- and nitrogen-doped lanthanum superhydride. United States: N. p., 2021.
Web. doi:10.1103/physrevb.104.214505.
Ge, Yanfeng, Zhang, Fan, & Hemley, Russell J. Room-temperature superconductivity in boron- and nitrogen-doped lanthanum superhydride. United States. https://doi.org/10.1103/physrevb.104.214505
Ge, Yanfeng, Zhang, Fan, and Hemley, Russell J. Wed .
"Room-temperature superconductivity in boron- and nitrogen-doped lanthanum superhydride". United States. https://doi.org/10.1103/physrevb.104.214505. https://www.osti.gov/servlets/purl/1835885.
@article{osti_1835885,
title = {Room-temperature superconductivity in boron- and nitrogen-doped lanthanum superhydride},
author = {Ge, Yanfeng and Zhang, Fan and Hemley, Russell J.},
abstractNote = {Recent theoretical and experimental studies of hydrogen-rich materials at megabar pressures (i.e., >100 GPa) have led to the discovery of very high-temperature superconductivity in these materials. Lanthanum superhydride LaH10 has been of particular focus as the first material to exhibit a superconducting critical temperature (Tc) near room temperature. Experiments indicate that the use of ammonia borane as the hydrogen source can increase the conductivity onset temperatures of lanthanum superhydride to as high as 290 K. In this work, we examine the doping effects of B and N atoms on the superconductivity of LaH10 in its fcc ($Fm\bar{3}m$) clathrate structure at megabar pressures. Doping at H atomic positions strengthens the H32 cages of the structure to give higher phonon frequencies that enhance the Debye frequency and thus the calculated Tc. The predicted Tc can reach 288 K in LaH9.985N0.015 within the average high-symmetry structure at 240 GPa. The remarkably large shift in Tc to higher values produced by small degrees of chemical doping opens the prospect for the creation of still higher-temperature superconductivity in superhydrides potentially at even lower-pressure conditions.},
doi = {10.1103/physrevb.104.214505},
journal = {Physical Review. B},
number = 21,
volume = 104,
place = {United States},
year = {Wed Dec 15 00:00:00 EST 2021},
month = {Wed Dec 15 00:00:00 EST 2021}
}
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