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

Journal Article · · Journal of Physics. Condensed Matter
 [1];  [2];  [3];  [2];  [2];  [2];  [2];  [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)
+ Show Author Affiliations
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.
Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1439427
Alternate ID(s):
OSTI ID: 23007236
Report Number(s):
IS-J--9665
Journal Information:
Journal of Physics. Condensed Matter, Journal Name: Journal of Physics. Condensed Matter Journal Issue: 22 Vol. 30; ISSN 0953-8984
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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Systematics of the temperature-dependent interplane resistivity in Ba(Fe 1 − x M x ) 2 As 2 ( M = Co , Rh, Ni, and Pd) journal July 2011
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Specific-heat discontinuity Δ C vs. T c in annealed Ba(Fe 1 − x Co x ) 2 As 2 journal August 2012
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Interplane resistivity of underdoped single crystals (Ba 1 − x K x )Fe 2 As 2 ( 0 ≤ x < 0.34 ) journal April 2014
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Cited By (2)

Disorder-Driven Transition from s ± to s + + Superconducting Order Parameter in Proton Irradiated Ba ( Fe 1 − x Rh x ) 2 As 2 Single Crystals journal September 2018
Microwave analysis of the interplay between magnetism and superconductivity in EuFe 2 ( As 1 − x P x ) 2 single crystals journal November 2019

Figures / Tables (3)

Figure 1(p. 5)figure Figure 1
Figure 2(p. 5)figure Figure 2
Figure 3(p. 6)figure Figure 3

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Fe-based superconductivity
London penetration depth
superconductivity
superfluid density