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Title: 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:
 [1];  [1];  [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [1]
  1. Univ. of Florida, Gainesville, FL (United States). Dept. of Physics
  2. 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) (SC-22)
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. doi: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. doi: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 = {2018},
month = {10}
}

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Figures / Tables:

Fig. 1 Fig. 1: Resistivity of single crystals of FeSe and FeSe0.94Be0.06 vs temperature showing the shift of Tc(ρ$\rightarrow$0), Tc mid and Tc onset caused by the addition of Be. The midpoint, ρ=0 Tc, and RRR values of FeSe as determined by resistivity measurements of our single crystals are 8.45 and 8.25more » K, and RRR=27 respectively, while the Be-doped sample has Tc midpoint, Tc(ρ$\rightarrow$0) and RRR values of 9.21 K, 9.06 K, and 102 respectively. (For a single crystal of FeSe0.97Be0.03, the resistivity data – not shown – give Tc(ρ$\rightarrow$0)=8.79 K, i. e. between the values for the parent compound and the 6% Be-doped compound. The extrapolated normal state residual resistivity, ρ(T$\rightarrow$0), of the FeSe0.97Be0.03 is also between that of FeSe and the 6% Be-doped compound.) The values for FeSe are comparable to literature values for good quality single crystal samples, indicating the high quality of the undoped FeSe samples in the present work. However, it is not hard to find in the literature rather broadened resistive transitions where Tc onset for pure FeSe is significantly higher than our value of 9.04 K, see e. g. the ~13.5 K value in polycrystalline material of ref. [19] (where Tc(ρ=0) was only 7.5 K). Note the apparent ρ linear-with-T behavior for T>Tc up to 20 K for both samples, and the larger linear-with-T slope for the Be-doped sample – see Fig. 2 for the extent of this linear behavior.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.