Unusual effects of Be doping in the iron-based superconductor FeSe
Abstract
Recent superconducting transition temperatures (Tc) over 100 K for monolayer FeSe on SrTiO3 have renewed interest in the bulk parent compound. In KCl:AlCl3 flux-transport-grown crystals of FeSe0.94Be0.06, FeSe0.97Be0.03 and, for comparison, FeSe, this work reports doping of FeSe using Be—among the smallest of possible dopants, corresponding to an effective 'chemical pressure'. According to lattice parameter measurements, 6% Be doping shrank the tetragonal FeSe lattice equivalent to a physical pressure of 0.75 GPa. Using this flux-transport method of sample preparation, 6% of Be was the maximum amount of dopant achievable. At this maximal composition of FeSe0.94Be0.06, the lattice unit cell shrinks by 2.4%, Tc—measured in the bulk via specific heat—increases by almost 10%, the Tc versus pressure behavior shifts its peak T$$onset\atop{c}$$downwards by ~1 GPa, the high temperature structural transition around T S = 89 K increases by 1.9 K (in contrast to other dopants in FeSe which uniformly depress T S), and the low temperature specific heat γ increases by 10% compared to pure FeSe. Also, upon doping by 6% Be the residual resistivity ratio, ρ(300 K)/ρ(T → 0), increases by almost a factor of four, while ρ(300 K)/ρ(T=$$+\atop{c}$$) increases by 50%.
- Authors:
-
- Univ. of Florida, Gainesville, FL (United States). Dept. of Physics
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1488705
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physics. Condensed Matter
- Additional Journal Information:
- Journal Volume: 30; Journal Issue: 44; Journal ID: ISSN 0953-8984
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Kim, J S., VanGennep, D., Hamlin, J. J., Wang, Xiaoping, Sefat, Athena Safa, and Stewart, G R. Unusual effects of Be doping in the iron-based superconductor FeSe. United States: N. p., 2018.
Web. doi:10.1088/1361-648X/aae3cf.
Kim, J S., VanGennep, D., Hamlin, J. J., Wang, Xiaoping, Sefat, Athena Safa, & Stewart, G R. Unusual effects of Be doping in the iron-based superconductor FeSe. United States. https://doi.org/10.1088/1361-648X/aae3cf
Kim, J S., VanGennep, D., Hamlin, J. J., Wang, Xiaoping, Sefat, Athena Safa, and Stewart, G R. Fri .
"Unusual effects of Be doping in the iron-based superconductor FeSe". United States. https://doi.org/10.1088/1361-648X/aae3cf. https://www.osti.gov/servlets/purl/1488705.
@article{osti_1488705,
title = {Unusual effects of Be doping in the iron-based superconductor FeSe},
author = {Kim, J S. and VanGennep, D. and Hamlin, J. J. and Wang, Xiaoping and Sefat, Athena Safa and Stewart, G R.},
abstractNote = {Recent superconducting transition temperatures (Tc) over 100 K for monolayer FeSe on SrTiO3 have renewed interest in the bulk parent compound. In KCl:AlCl3 flux-transport-grown crystals of FeSe0.94Be0.06, FeSe0.97Be0.03 and, for comparison, FeSe, this work reports doping of FeSe using Be—among the smallest of possible dopants, corresponding to an effective 'chemical pressure'. According to lattice parameter measurements, 6% Be doping shrank the tetragonal FeSe lattice equivalent to a physical pressure of 0.75 GPa. Using this flux-transport method of sample preparation, 6% of Be was the maximum amount of dopant achievable. At this maximal composition of FeSe0.94Be0.06, the lattice unit cell shrinks by 2.4%, Tc—measured in the bulk via specific heat—increases by almost 10%, the Tc versus pressure behavior shifts its peak T$onset\atop{c}$downwards by ~1 GPa, the high temperature structural transition around T S = 89 K increases by 1.9 K (in contrast to other dopants in FeSe which uniformly depress T S), and the low temperature specific heat γ increases by 10% compared to pure FeSe. Also, upon doping by 6% Be the residual resistivity ratio, ρ(300 K)/ρ(T → 0), increases by almost a factor of four, while ρ(300 K)/ρ(T=$+\atop{c}$) increases by 50%.},
doi = {10.1088/1361-648X/aae3cf},
journal = {Journal of Physics. Condensed Matter},
number = 44,
volume = 30,
place = {United States},
year = {Fri Oct 12 00:00:00 EDT 2018},
month = {Fri Oct 12 00:00:00 EDT 2018}
}
Web of Science
Figures / Tables:
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Figures / Tables found in this record: