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

Title: Superconductivity with Tc ≈ 7 K under pressure for Cu- and Au-doped BaFe2As2

Journal Article · · Journal of Physics. Condensed Matter

It is noteworthy that chemical substitution of BaFe2As2 (122) with the noble elements Cu and Au gives superconductivity with a maximum Tc ≈ 3 K, while Ag substitution (Ag-122) stays antiferromagnetic. For Ba(Fe1–xTMx)2As2, TM = Cu, Au, or Ag, and by doping an amount of x = 0.04, a-lattice parameter slightly increases (0.4%) for all TM dopants, while c-lattice decreases (–0.2%) for TM = Cu, barely moves (0.05%) for Au, and increases (0.2%) for Ag. Despite the naive expectation that the noble elements of group 11 should affect the quantum properties of 122 similarly, they produce significant differences extending to the character of the ground state. For the Ag-122 crystal, evidence of only a filamentary superconductivity is noted with pressure. However, for Au and Cu doping (x ≈ 0.03) we find a substantial improvement in the superconductivity, with Tc increasing to 7 K and 7.5 K, respectively, under 20 kbar of pressure. As with the ambient pressure results, the identity of the dopant therefore has a substantial impact on the ground state properties. Further, density functional theory calculations corroborate these results and find evidence of strong electronic scattering for Au and Ag dopants, while Cu is comparatively less disruptive to the 122 electronic structure.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1897873
Journal Information:
Journal of Physics. Condensed Matter, Vol. 32, Issue 29; ISSN 0953-8984
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

References (42)

Avoided Quantum Criticality and Magnetoelastic Coupling in BaFe 2 x Ni x As 2 journal June 2013
Competition between stripe and checkerboard magnetic instabilities in Mn-doped BaFe 2 As 2 journal July 2012
Chemistry and electronic structure of iron-based superconductors journal August 2011
Magnetically polarized Ir dopant atoms in superconducting Ba(Fe 1 x Ir x ) 2 As 2 journal April 2012
Impurities in multiband superconductors journal December 2016
Local Inhomogeneity and Filamentary Superconductivity in Pr-Doped CaFe 2 As 2 journal January 2014
Role of magnetism in superconductivity of BaF e 2 A s 2 : Study of 5 d Au-doped crystals journal September 2015
Temperature versus doping phase diagrams for Ba ( Fe 1 x TM x ) 2 As 2 ( TM = Ni , Cu , Cu / Co ) single crystals journal July 2010
Persistent magnetism in silver-doped BaF e 2 A s 2 crystals journal October 2016
Magnetic ordering and structural distortion in Ru-doped BaFe 2 As 2 single crystals studied by neutron and x-ray diffraction journal February 2011
Iron-based high transition temperature superconductors journal July 2014
Spectroscopic scanning tunneling microscopy insights into Fe-based superconductors journal November 2011
Combined effects of pressure and Ru substitution on BaFe 2 As 2 journal October 2011
Orbital Occupancy and Charge Doping in Iron-Based Superconductors journal July 2014
Iron-based superconductors: Magnetism, superconductivity, and electronic structure (Review Article) journal September 2012
Phase diagrams of Ba ( Fe 1 x M x ) 2 As 2 single crystals ( M = Rh and Pd) journal July 2009
Properties of the multiorbital Hubbard models for the iron-based superconductors journal December 2011
Coexistence of Competing Antiferromagnetic and Superconducting Phases in the Underdoped Ba ( Fe 0.953 Co 0.047 ) 2 As 2 Compound Using X-ray and Neutron Scattering Techniques journal August 2009
Effect of annealing on the specific heat of Ba(Fe 1 x Co x ) 2 As 2 journal February 2011
Bulk synthesis of iron-based superconductors journal April 2013
Variation of physical properties in the nominal Sr4V2O6Fe2As2 journal March 2011
Improving superconductivity in BaFe2As2-based crystals by cobalt clustering and electronic uniformity journal April 2017
Renormalized behavior and proximity of BaCo 2 As 2 to a magnetic quantum critical point journal January 2009
Superconductivity in Ru-substituted polycrystalline BaFe 2 x Ru x As 2 journal May 2010
Absence of superconductivity in hole-doped BaFe 2 x Cr x As 2 single crystals journal June 2009
Nematicity, magnetism and superconductivity in FeSe journal December 2017
NMR study of nematic spin fluctuations in a detwinned single crystal of underdoped Ba ( Fe 1 x Co x ) 2 As 2 journal October 2016
Competing magnetic ground states in nonsuperconducting Ba( Fe 1 x Cr x ) 2 As 2 as seen via neutron diffraction journal February 2011
Role of the orbital degree of freedom in iron-based superconductors journal October 2017
Evidence of pinning crossover and the role of twin boundaries in the peak effect in FeSeTe iron based superconductor journal December 2017
High-temperature superconductivity in iron pnictides and chalcogenides journal March 2016
Pressure effects on two superconducting iron-based families journal September 2011
What drives nematic order in iron-based superconductors? journal January 2014
Structure and property correlations in FeS journal March 2017
Superconductivity at 22 K in Co-Doped BaFe 2 As 2 Crystals journal September 2008
Spin-density-wave anomaly at 140 K in the ternary iron arsenide BaFe 2 As 2 journal July 2008
Anomalous Suppression of the Orthorhombic Lattice Distortion in Superconducting Ba ( Fe 1 x Co x ) 2 As 2 Single Crystals journal February 2010
BaT2As2 single crystals (T=Fe, Co, Ni) and superconductivity upon Co-doping journal May 2009
Suppression of antiferromagnetic order and orthorhombic distortion in superconducting Ba ( Fe 0.961 Rh 0.039 ) 2 As 2 journal April 2010
Effect of molybdenum 4 d hole substitution in BaFe 2 As 2 journal January 2012
Local superconductivity in vanadium iron arsenide journal September 2019
Annealing effects on the properties of BFe 2 As 2 (B = Ca, Sr, Ba) superconducting parents journal January 2014

Similar Records

Role of magnetism in superconductivity of BaFe2As2: Study of 5d Au-doped crystals
Journal Article · Wed Sep 09 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics · OSTI ID:1897873

Incorporation of gold into YBa sub 2 Cu sub 3 O sub 7 : Structure and Tc enhancement
Journal Article · Mon Oct 01 00:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA) · OSTI ID:1897873

Final Technical Report for DE-FG02-86ER45268
Technical Report · Sun Feb 09 00:00:00 EST 2020 · OSTI ID:1897873