Pressure effects on the electron-doped high Tc superconductor BaFe2-xCoxAs2

doi:https://doi.org/10.1088/0953-8984/20/47/472201

Title: Pressure effects on the electron-doped high Tc superconductor BaFe2-xCoxAs2

Full Record
Other Related Research

Abstract

Application of pressure or electron doping through Co substitution into Fe sites transforms the itinerant antiferromagnet BaFe{sub 2}As{sub 2} into a superconductor with T{sub c} exceeding 20 K. We carried out systematic transport measurements of BaFe{sub 2?x}Co{sub x}As{sub 2} superconductors in pressures up to 2.5 GPa, and elucidated the interplay between the effects of electron doping and pressure. For the underdoped sample with nominal composition x = 0.08, application of pressure strongly suppresses a magnetic instability while enhancing T{sub c} by nearly a factor of two from 11 to 21 K. In contrast, the optimally doped x = 0.20 sample shows very little enhancement of T{sub c} = 22 K under applied pressure. Our results strongly suggest that the proximity to a magnetic instability is the key to the mechanism of superconductivity in iron-pnictides.

Authors:

Ahilan, K. ^[1]; Balasubramaniam, J. ^[2]; Ning, F. L. ^[1]; Imai, T. ^[1]; Safa-Sefat, Athena ^[3]; Jin, Rongying ^[3]; McGuire, Michael A ^[3]; Sales, Brian C ^[3]; Mandrus, David ^[3]

McMaster University
Canadian Institute for Advanced Research
ORNL

Publication Date:: 2008-01-01

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 965870

DOE Contract Number:: DE-AC05-00OR22725

Resource Type:: Journal Article

Journal Name:: Journal of Physics: Condensed Matter

Additional Journal Information:: Journal Volume: 20; Journal Issue: 47

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; ELECTRONS; DOPED MATERIALS; COBALT ARSENIDES; BARIUM COMPOUNDS; ARSENIDES; IRON ARSENIDES; PRESSURE DEPENDENCE; SUPERCONDUCTIVITY; HIGH-TC SUPERCONDUCTORS; TRANSITION TEMPERATURE

Citation Formats


                    Ahilan, K., Balasubramaniam, J., Ning, F. L., Imai, T., Safa-Sefat, Athena, Jin, Rongying, McGuire, Michael A, Sales, Brian C, and Mandrus, David. Pressure effects on the electron-doped high Tc superconductor BaFe2-xCoxAs2.  United States: N. p., 2008. 
        Web.  doi:10.1088/0953-8984/20/47/472201.

Copy to clipboard


                    Ahilan, K., Balasubramaniam, J., Ning, F. L., Imai, T., Safa-Sefat, Athena, Jin, Rongying, McGuire, Michael A, Sales, Brian C, & Mandrus, David. Pressure effects on the electron-doped high Tc superconductor BaFe2-xCoxAs2.  United States.  https://doi.org/10.1088/0953-8984/20/47/472201

Copy to clipboard


                    Ahilan, K., Balasubramaniam, J., Ning, F. L., Imai, T., Safa-Sefat, Athena, Jin, Rongying, McGuire, Michael A, Sales, Brian C, and Mandrus, David. Tue .  
        "Pressure effects on the electron-doped high Tc superconductor BaFe2-xCoxAs2".  United States.  https://doi.org/10.1088/0953-8984/20/47/472201.

Copy to clipboard


                    
@article{osti_965870,

  title        = {Pressure effects on the electron-doped high Tc superconductor BaFe2-xCoxAs2},

  author       = {Ahilan, K. and Balasubramaniam, J. and Ning, F. L. and Imai, T. and Safa-Sefat, Athena and Jin, Rongying and McGuire, Michael A and Sales, Brian C and Mandrus, David},

  abstractNote = {Application of pressure or electron doping through Co substitution into Fe sites transforms the itinerant antiferromagnet BaFe{sub 2}As{sub 2} into a superconductor with T{sub c} exceeding 20 K. We carried out systematic transport measurements of BaFe{sub 2?x}Co{sub x}As{sub 2} superconductors in pressures up to 2.5 GPa, and elucidated the interplay between the effects of electron doping and pressure. For the underdoped sample with nominal composition x = 0.08, application of pressure strongly suppresses a magnetic instability while enhancing T{sub c} by nearly a factor of two from 11 to 21 K. In contrast, the optimally doped x = 0.20 sample shows very little enhancement of T{sub c} = 22 K under applied pressure. Our results strongly suggest that the proximity to a magnetic instability is the key to the mechanism of superconductivity in iron-pnictides.},

  doi          = {10.1088/0953-8984/20/47/472201},

  url          = {https://www.osti.gov/biblio/965870},
  journal      = {Journal of Physics: Condensed Matter},
number       = 47,

  volume       = 20,

  place        = {United States},

  year         = {2008},

  month        = {1}

}

Copy to clipboard

Journal Article:

https://doi.org/10.1088/0953-8984/20/47/472201

Other availability

Find in Google Scholar

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

Electronic phase diagram of the iron-based high-Tc superconductor Ba(Fe1 xCox)2As2 under hydrostatic pressure (0 is less than or equal to x is less than or equal to 0.099)

Journal Article Ahilan, K. ; Ning, F. L. ; Imai, T. ; ... - Physical Review B

We report comprehensive resistivity measurements of single-crystalline samples of the Ba(Fe{sub 1-x}Co{sub x}){sub 2}As{sub 2} high-T{sub c} superconductor under hydrostatic pressure up to 2.75 GPa and over a broad concentration range, 0 {le} x {le} 0.099. We show that application of pressure progressively suppresses the spin-density wave (SDW) transition temperature, T{sub SDW}, in the underdoped regime (x {approx}< 0.051). There is no sign of pressure-induced superconductivity in the undoped BaFe{sub 2}As{sub 2} down to 1.8 K but applied pressure dramatically enhances T{sub c} in the underdoped regime 0.02 {approx}< x {approx}< 0.051. The effect of pressure on T{sub c} ismore »« less
https://doi.org/10.1103/PhysRevB.79.214520
Universal doping evolution of the superconducting gap anisotropy in single crystals of electron-doped Ba(Fe _1–xRh _x) ₂As ₂ from London penetration depth measurements

Journal Article Kim, Hyunsoo ; Tanatar, M. A. ; Martin, C. ; ... - Journal of Physics. Condensed Matter

Doping evolution of the superconducting gap anisotropy was studied in single crystals of 4d-electron doped Ba(Fe _1–xRh _x) ₂As ₂ 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 ( T _c = 15.5 K), close to optimal doping x = 0.057 ( T _c = 24.4 K) and overdoped x = 0.079 ( T _c = 21.5 K) and x = 0.131( T _c = 4.9 K) were studied. Superconducting energy gap anisotropy was characterized by the exponent, n,more »« less
Cited by 1
https://doi.org/10.1088/1361-648X/aabef9

Full Text Available
59Co and 75As NMR Investigation of Electron-Doped High Tc Superconductor BaFe1.8Co0.2As2 (Tc=22 K)

Journal Article Ning, F. L. ; Ahilan, K. ; Imai, T. ; ... - Journal of the Physical Society of Japan

We report an NMR investigation of the superconductivity in BaFe{sub 2}As{sub 2} induced by Co doping (T{sub c} = 22 K). We demonstrate that Co atoms form an alloy with Fe atoms and donate carriers without creating localized moments. Our finding strongly suggests that the underlying physics of iron-pnictide superconductors is quite different from the widely accepted physical picture of high T{sub c} cuprates as doped Mott insulators. We also show a crossover of electronic properties into a low temperature pseudo-gap phase with a pseudo-gap {Delta}{sub PG}/k{sub B} -560 K, where {chi}{sub spin} -constant and resisitivty {rho} {proportional_to} T. Themore »« less
https://doi.org/10.1143/JPSJ.77.103705
Studies of anisotropy of iron based superconductors

Thesis/Dissertation Murphy, Jason

To study the electronic anisotropy in iron based superconductors, the temperature dependent London penetration depth, Δλ (T), have been measured in several compounds, along with the angular dependent upper critical field, H _c2(T). Study was undertaken on single crystals of Ba(Fe _1-xCo _x) ₂As ₂ with x=0.108 and x=0.127, in the overdoped range of the doping phase diagram, characterized by notable modulation of the superconducting gap. Heavy ion irradiation with matching field doses of 6 T and 6.5 T respectively, were used to create columnar defects and to study their effect on the temperature Δλ (T). The variation of themore »« less
https://doi.org/10.2172/1116722

Full Text Available
SISGR: Atom chip microscopy: A novel probe for strongly correlated materials

Technical Report Lev, Benjamin L.

Microscopy techniques co-opted from nonlinear optics and high energy physics have complemented solid-state probes in elucidating the order manifest in condensed matter materials. Up until now, however, no attempts have been made to use modern techniques of ultracold atomic physics to directly explore properties of strongly correlated or topologically protected materials. Our current program is focused on introducing a novel magnetic field microscopy technique into the toolbox of imaging probes. Our prior DOE ESPM program funded the development of a novel instrument using a dilute gas Bose-Einstein condensate (BEC) as a scanning probe capable of measuring tiny magnetic (and electric)more »« less

Similar Records