skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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:
Journal Article: 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. doi: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. 2018. "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},
url = {https://www.osti.gov/biblio/1439427}, journal = {Journal of Physics. Condensed Matter},
issn = {0953-8984},
number = 22,
volume = 30,
place = {United States},
year = {2018},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 1 work
Citation information provided by
Web of Science

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

Save / Share:

Works referenced in this record:

A Sharp Peak of the Zero-Temperature Penetration Depth at Optimal Composition in BaFe2(As1-xPx)2
journal, June 2012


Superconductivity gets an iron boost
journal, March 2010


Pairing Mechanism in Fe-Based Superconductors
journal, March 2012


Field-dependent transport critical current in single crystals of Ba(Fe 1 − x TM x ) 2 As 2 (TM = Co, Ni) superconductors
journal, April 2010


Interplane resistivity of underdoped single crystals (Ba 1 x K x )Fe 2 As 2 ( 0 x < 0.34 )
journal, April 2014


The London penetration depth in BaFe 2 As 2 superconductors at high electron doping level
journal, May 2010


Phase diagrams of Ba ( Fe 1 x M x ) 2 As 2 single crystals ( M = Rh and Pd)
journal, July 2009


Quantum Criticality and Nodal Superconductivity in the FeAs-Based Superconductor KFe 2 As 2
journal, February 2010


Universal Heat Conduction in the Iron Arsenide Superconductor KFe 2 As 2 : Evidence of a d -Wave State
journal, August 2012


Energy gap evolution across the superconductivity dome in single crystals of (Ba 1− x K x )Fe 2 As 2
journal, September 2016


FeAs-Based Superconductivity: A Case Study of the Effects of Transition Metal Doping on BaFe 2 As 2
journal, August 2010


Superconductivity and Crystal Structures of (Ba 1− x K x )Fe 2 As 2 ( x =0-1)
journal, September 2008


Meissner-London state in superconductors of rectangular cross section in a perpendicular magnetic field
journal, July 2000


Unconventional Superconductivity with a Sign Reversal in the Order Parameter of LaFeAsO 1 x F x
journal, July 2008


Dome – like variation of the superconducting gap anisotropy in Fe-based superconductors
journal, July 2013


Specific-heat discontinuity Δ C vs. T c in annealed Ba(Fe 1 x Co x ) 2 As 2
journal, August 2012


Gap symmetry and structure of Fe-based superconductors
journal, October 2011


Magnetic penetration depth in unconventional superconductors
journal, June 2006


London penetration depth in iron-based superconductors
journal, September 2011


Specific-heat discontinuity Δ C vs. T c in annealed Ba(Fe 1 x Co x ) 2 As 2
journal, August 2012


Unconventional Superconductivity with a Sign Reversal in the Order Parameter of LaFeAsO 1 x F x
journal, July 2008


Quantum Criticality and Nodal Superconductivity in the FeAs-Based Superconductor KFe 2 As 2
journal, February 2010


Universal Heat Conduction in the Iron Arsenide Superconductor KFe 2 As 2 : Evidence of a d -Wave State
journal, August 2012


Phase diagrams of Ba ( Fe 1 x M x ) 2 As 2 single crystals ( M = Rh and Pd)
journal, July 2009


Interplane resistivity of underdoped single crystals (Ba 1 x K x )Fe 2 As 2 ( 0 x < 0.34 )
journal, April 2014


Meissner-London state in superconductors of rectangular cross section in a perpendicular magnetic field
journal, July 2000


Magnetic penetration depth in unconventional superconductors
journal, June 2006


Magnetic Penetration Depth in Unconventional Superconductors
journal, January 2007


Works referencing / citing this record:

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