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Niobium substitution suppresses the superconducting critical temperature of pressurized MoB 2
Abstract
A recent study has demonstrated that MoB2, transforming to the same structure as MgB2 (P6/mmm), superconducts at temperatures above 30 K near 100 GPa [C. Pei et al., Natl. Sci. Rev. 10, nwad034 (2023)], and Nb substitution in MoB2 stabilizes the P6/mmm structure down to ambient pressure [A. C. Hire et al., Phys. Rev. B 106, 174515 (2022)]. Here, the current work explores the high-pressure superconducting behavior of Nb-substituted MoB2 (Nb0.25Mo0.75B2). High-pressure x-ray diffraction measurements show that the sample remains in the ambient pressure P6/mmm structure to at least 160 GPa. Electrical resistivity measurements demonstrate that from an ambient pressure Tc of 8K (confirmed by specific heat to be a bulk effect), the critical temperature is suppressed to 4 K at 50 GPa, before gradually rising to 5.5 K at 170 GPa. The critical temperature at high pressure is thus significantly lower than that found in MoB2 under pressure (30 K), revealing that Nb substitution results in a strong suppression of the superconducting critical temperature. Our calculations indeed find a reduced electron-phonon coupling in Nb0.25Mo0.75B2, but do not account fully for the observed suppression, which may also arise from inhomogeneity and enhanced spin fluctuations.
- Authors:
-
[1];
[1];
[1];
[1];
[3];
- Univ. of Florida, Gainesville, FL (United States)
- Univ. of Illinois, Chicago, IL (United States)
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
- OSTI Identifier:
- 2007155
- Grant/Contract Number:
- AC02-06CH11357; SC0020385; NA0003975; FG02-94ER14466
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 108; Journal Issue: 9; 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; pressure effects; structural properties; superconductivity; alloys; density functional calculations; resistivity measurements; x-ray diffraction
Citation Formats
Lim, J., Sinha, S., Hire, A. C., Kim, J. S., Dee, P. M., Kumar, R. S., Popov, D., Hemley, R. J., Hennig, R. G., Hirschfeld, P. J., Stewart, G. R., and Hamlin, J. J. Niobium substitution suppresses the superconducting critical temperature of pressurized MoB2. United States: N. p., 2023.
Web. doi:10.1103/physrevb.108.094501.
Lim, J., Sinha, S., Hire, A. C., Kim, J. S., Dee, P. M., Kumar, R. S., Popov, D., Hemley, R. J., Hennig, R. G., Hirschfeld, P. J., Stewart, G. R., & Hamlin, J. J. Niobium substitution suppresses the superconducting critical temperature of pressurized MoB2. United States. https://doi.org/10.1103/physrevb.108.094501
Lim, J., Sinha, S., Hire, A. C., Kim, J. S., Dee, P. M., Kumar, R. S., Popov, D., Hemley, R. J., Hennig, R. G., Hirschfeld, P. J., Stewart, G. R., and Hamlin, J. J. Fri .
"Niobium substitution suppresses the superconducting critical temperature of pressurized MoB2". United States. https://doi.org/10.1103/physrevb.108.094501.
@article{osti_2007155,
title = {Niobium substitution suppresses the superconducting critical temperature of pressurized MoB2},
author = {Lim, J. and Sinha, S. and Hire, A. C. and Kim, J. S. and Dee, P. M. and Kumar, R. S. and Popov, D. and Hemley, R. J. and Hennig, R. G. and Hirschfeld, P. J. and Stewart, G. R. and Hamlin, J. J.},
abstractNote = {A recent study has demonstrated that MoB2, transforming to the same structure as MgB2 (P6/mmm), superconducts at temperatures above 30 K near 100 GPa [C. Pei et al., Natl. Sci. Rev. 10, nwad034 (2023)], and Nb substitution in MoB2 stabilizes the P6/mmm structure down to ambient pressure [A. C. Hire et al., Phys. Rev. B 106, 174515 (2022)]. Here, the current work explores the high-pressure superconducting behavior of Nb-substituted MoB2 (Nb0.25Mo0.75B2). High-pressure x-ray diffraction measurements show that the sample remains in the ambient pressure P6/mmm structure to at least 160 GPa. Electrical resistivity measurements demonstrate that from an ambient pressure Tc of 8K (confirmed by specific heat to be a bulk effect), the critical temperature is suppressed to 4 K at 50 GPa, before gradually rising to 5.5 K at 170 GPa. The critical temperature at high pressure is thus significantly lower than that found in MoB2 under pressure (30 K), revealing that Nb substitution results in a strong suppression of the superconducting critical temperature. Our calculations indeed find a reduced electron-phonon coupling in Nb0.25Mo0.75B2, but do not account fully for the observed suppression, which may also arise from inhomogeneity and enhanced spin fluctuations.},
doi = {10.1103/physrevb.108.094501},
journal = {Physical Review. B},
number = 9,
volume = 108,
place = {United States},
year = {Fri Sep 01 00:00:00 EDT 2023},
month = {Fri Sep 01 00:00:00 EDT 2023}
}
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