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Title: Universal doping evolution of the superconducting gap anisotropy in single crystals of electron-doped Ba(Fe1–xRhx)2As2 from London penetration depth measurements

Abstract

Doping evolution of the superconducting gap anisotropy was studied in single crystals of 4d-electron doped Ba(Fe1–xRhx)2As2 using tunnel diode resonator measurements of the temperature variation of the London penetration depth Δλ(T). Single crystals with doping levels representative of an underdoped regime x = 0.039 (Tc = 15.5 K), close to optimal doping x = 0.057 (Tc = 24.4 K) and overdoped x = 0.079 (Tc = 21.5 K) and x = 0.131(Tc = 4.9 K) were studied. Superconducting energy gap anisotropy was characterized by the exponent, n, by fitting the data to the power-law, Δλ = ATn. The exponent n varies non-monotonically with x, increasing to a maximum n = 2.5 for x = 0.079 and rapidly decreasing towards overdoped compositions to 1.6 for x = 0.131. This behavior is qualitatively similar to the doping evolution of the superconducting gap anisotropy in other iron pnictides, including hole-doped (Ba,K)Fe2As2 and 3d-electron-doped Ba(Fe,Co)2As2 superconductors, finding a full gap near optimal doping and strong anisotropy toward the ends of the superconducting dome in the T-x phase diagram. The normalized superfluid density in an optimally Rh-doped sample is almost identical to the temperature-dependence in the optimally doped Ba(Fe,Co)2As2 samples. In conclusion, our study supportsmore » the universal superconducting gap variation with doping and pairing at least in iron based superconductors of the BaFe2As2 family.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [2];  [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States); Univ. of Maryland, College Park, MD (United States)
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  3. Ames Lab. and Iowa State Univ., Ames, IA (United States); Ramapo College of New Jersey, Mahwah, NJ (United States)
Publication Date:
Research Org.:
Ames Lab., Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1439427
Report Number(s):
IS-J-9665
Journal ID: ISSN 0953-8984; TRN: US1900609
Grant/Contract Number:  
AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physics. Condensed Matter
Additional Journal Information:
Journal Volume: 30; Journal Issue: 22; Journal ID: ISSN 0953-8984
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; superconductivity; London penetration depth; superfluid density; Fe-based superconductivity

Citation Formats

Kim, Hyunsoo, Tanatar, M. A., Martin, C., Blomberg, E. C., Ni, Ni, Bud'ko, S. L., Canfield, P. C., and Prozorov, R. Universal doping evolution of the superconducting gap anisotropy in single crystals of electron-doped Ba(Fe1–xRhx)2As2 from London penetration depth measurements. United States: N. p., 2018. Web. https://doi.org/10.1088/1361-648X/aabef9.
Kim, Hyunsoo, Tanatar, M. A., Martin, C., Blomberg, E. C., Ni, Ni, Bud'ko, S. L., Canfield, P. C., & Prozorov, R. Universal doping evolution of the superconducting gap anisotropy in single crystals of electron-doped Ba(Fe1–xRhx)2As2 from London penetration depth measurements. United States. https://doi.org/10.1088/1361-648X/aabef9
Kim, Hyunsoo, Tanatar, M. A., Martin, C., Blomberg, E. C., Ni, Ni, Bud'ko, S. L., Canfield, P. C., and Prozorov, R. Tue . "Universal doping evolution of the superconducting gap anisotropy in single crystals of electron-doped Ba(Fe1–xRhx)2As2 from London penetration depth measurements". United States. https://doi.org/10.1088/1361-648X/aabef9. https://www.osti.gov/servlets/purl/1439427.
@article{osti_1439427,
title = {Universal doping evolution of the superconducting gap anisotropy in single crystals of electron-doped Ba(Fe1–xRhx)2As2 from London penetration depth measurements},
author = {Kim, Hyunsoo and Tanatar, M. A. and Martin, C. and Blomberg, E. C. and Ni, Ni and Bud'ko, S. L. and Canfield, P. C. and Prozorov, R.},
abstractNote = {Doping evolution of the superconducting gap anisotropy was studied in single crystals of 4d-electron doped Ba(Fe1–xRhx)2As2 using tunnel diode resonator measurements of the temperature variation of the London penetration depth Δλ(T). Single crystals with doping levels representative of an underdoped regime x = 0.039 (Tc = 15.5 K), close to optimal doping x = 0.057 (Tc = 24.4 K) and overdoped x = 0.079 (Tc = 21.5 K) and x = 0.131(Tc = 4.9 K) were studied. Superconducting energy gap anisotropy was characterized by the exponent, n, by fitting the data to the power-law, Δλ = ATn. The exponent n varies non-monotonically with x, increasing to a maximum n = 2.5 for x = 0.079 and rapidly decreasing towards overdoped compositions to 1.6 for x = 0.131. This behavior is qualitatively similar to the doping evolution of the superconducting gap anisotropy in other iron pnictides, including hole-doped (Ba,K)Fe2As2 and 3d-electron-doped Ba(Fe,Co)2As2 superconductors, finding a full gap near optimal doping and strong anisotropy toward the ends of the superconducting dome in the T-x phase diagram. The normalized superfluid density in an optimally Rh-doped sample is almost identical to the temperature-dependence in the optimally doped Ba(Fe,Co)2As2 samples. In conclusion, our study supports the universal superconducting gap variation with doping and pairing at least in iron based superconductors of the BaFe2As2 family.},
doi = {10.1088/1361-648X/aabef9},
journal = {Journal of Physics. Condensed Matter},
number = 22,
volume = 30,
place = {United States},
year = {2018},
month = {5}
}

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Figures / Tables:

Figure 1 Figure 1: (a) Normalized temperature variation of the London penetration depth ∆λ(T)/∆λ(Tc) in samples of Ba(Fe1−xRhx)2As2, left to right x = 0.131 (red), x = 0.039 (green), x = 0.076 (black) and x = 0.057 (magenta). (b) Magneto-optical images of selected optimally doped samples (x = 0.057) showing homogeneous expulsionmore » of magnetic field after zero field cooling and application of magnetic field at 5 K, the base temperature of the setup. (c) Doping dependence of the superconducting Tc in samples studied. The Tc was determined using the maximum of the penetration depth derivative, d∆λ/dT , as a criterion. The composition of the samples was determined using WDS. For reference we show data from [28] (dashed line).« less

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