BaT2As2 single crystals (T = Fe, Co, Ni) and superconductivity upon Co-doping

Athena S. Sefat; David J. Singh; Rongying Jin; Michael A. McGuire; Brian C. Sales; Filip Ronning; David Mandrus

doi:10.1016/j.physc.2009.03.025

BaT₂As₂ single crystals (T = Fe, Co, Ni) and superconductivity upon Co-doping

Athena S. Sefat, David J. Singh, Rongying Jin, Michael A. McGuire, Brian C. Sales, Filip Ronning, David Mandrus

Correlated Electron Materials

Research output: Contribution to journal › Article › peer-review

35 Scopus citations

Abstract

The crystal structure and physical properties of BaFe₂As₂, BaCo₂As₂, and BaNi₂As₂ single crystals are surveyed. BaFe₂As₂ gives a magnetic and structural transition at T_N = 132(1) K, BaCo₂As₂ is a paramagnetic metal, while BaNi₂As₂ has a structural phase transition at T₀ = 131 K, followed by superconductivity below T_c = 0.69 K. The bulk superconductivity in Co-doped BaFe₂As₂ below T_c = 22 K is demonstrated by resistivity, magnetic susceptibility, and specific heat data. In contrast to the cuprates, the Fe-based system appears to tolerate considerable disorder in the transition metal layers. First principles calculations for BaFe_1.84Co_0.16As₂ indicate the inter-band scattering due to Co is weak.

Original language	English
Pages (from-to)	350-354
Number of pages	5
Journal	Physica C: Superconductivity and its Applications
Volume	469
Issue number	9-12
DOIs	https://doi.org/10.1016/j.physc.2009.03.025
State	Published - 2009

Funding

Research sponsored by the Division of Materials Science and Engineering, Office of Basic Energy Sciences. Part of this research was performed by Eugene P. Wigner Fellows at ORNL. Work at Los Alamos was performed under the auspices of the US Department of Energy.

Funders	Funder number
Division of Materials Science and Engineering
Office of Basic Energy Sciences

Keywords

BaFeAs
Co-doping
Iron-based
Superconductors
ThCrSi-type

Access to Document

10.1016/j.physc.2009.03.025

Cite this

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title = "BaT2As2 single crystals (T = Fe, Co, Ni) and superconductivity upon Co-doping",

abstract = "The crystal structure and physical properties of BaFe2As2, BaCo2As2, and BaNi2As2 single crystals are surveyed. BaFe2As2 gives a magnetic and structural transition at TN = 132(1) K, BaCo2As2 is a paramagnetic metal, while BaNi2As2 has a structural phase transition at T0 = 131 K, followed by superconductivity below Tc = 0.69 K. The bulk superconductivity in Co-doped BaFe2As2 below Tc = 22 K is demonstrated by resistivity, magnetic susceptibility, and specific heat data. In contrast to the cuprates, the Fe-based system appears to tolerate considerable disorder in the transition metal layers. First principles calculations for BaFe1.84Co0.16As2 indicate the inter-band scattering due to Co is weak.",

keywords = "BaFeAs, Co-doping, Iron-based, Superconductors, ThCrSi-type",

author = "Sefat, {Athena S.} and Singh, {David J.} and Rongying Jin and McGuire, {Michael A.} and Sales, {Brian C.} and Filip Ronning and David Mandrus",

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T1 - BaT2As2 single crystals (T = Fe, Co, Ni) and superconductivity upon Co-doping

AU - Sefat, Athena S.

AU - Singh, David J.

AU - Jin, Rongying

AU - McGuire, Michael A.

AU - Sales, Brian C.

AU - Ronning, Filip

AU - Mandrus, David

PY - 2009

Y1 - 2009

N2 - The crystal structure and physical properties of BaFe2As2, BaCo2As2, and BaNi2As2 single crystals are surveyed. BaFe2As2 gives a magnetic and structural transition at TN = 132(1) K, BaCo2As2 is a paramagnetic metal, while BaNi2As2 has a structural phase transition at T0 = 131 K, followed by superconductivity below Tc = 0.69 K. The bulk superconductivity in Co-doped BaFe2As2 below Tc = 22 K is demonstrated by resistivity, magnetic susceptibility, and specific heat data. In contrast to the cuprates, the Fe-based system appears to tolerate considerable disorder in the transition metal layers. First principles calculations for BaFe1.84Co0.16As2 indicate the inter-band scattering due to Co is weak.

AB - The crystal structure and physical properties of BaFe2As2, BaCo2As2, and BaNi2As2 single crystals are surveyed. BaFe2As2 gives a magnetic and structural transition at TN = 132(1) K, BaCo2As2 is a paramagnetic metal, while BaNi2As2 has a structural phase transition at T0 = 131 K, followed by superconductivity below Tc = 0.69 K. The bulk superconductivity in Co-doped BaFe2As2 below Tc = 22 K is demonstrated by resistivity, magnetic susceptibility, and specific heat data. In contrast to the cuprates, the Fe-based system appears to tolerate considerable disorder in the transition metal layers. First principles calculations for BaFe1.84Co0.16As2 indicate the inter-band scattering due to Co is weak.

KW - BaFeAs

KW - Co-doping

KW - Iron-based

KW - Superconductors

KW - ThCrSi-type

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