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      Importance of the Fermi-surface topology to the superconducting state of the electron-doped pnictide Ba(Fe\({}_{1-x}\)Co\({}_{x}\))\({}_{2}\)As\({}_{2}\)

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          Effects of Co substitution on thermodynamic and transport properties and anisotropic\({H}_{c2}\)in\(\text{Ba}{\left({\text{Fe}}_{1-x}{\text{Co}}_{x}\right)}_{2}{\text{As}}_{2}\)single crystals

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            Determination of the phase diagram of the electron-doped superconductor\(\text{Ba}{\left({\text{Fe}}_{1-x}{\text{Co}}_{x}\right)}_{2}{\text{As}}_{2}\)

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              Anomalous suppression of the orthorhombic lattice distortion in superconducting Ba(Fe1-xCox)2As2 single crystals.

              High-resolution x-ray diffraction measurements reveal an unusually strong response of the lattice to superconductivity in Ba(Fe1-xCox)2As2. The orthorhombic distortion of the lattice is suppressed and, for Co doping near x=0.063, the orthorhombic structure evolves smoothly back to a tetragonal structure. We propose that the coupling between orthorhombicity and superconductivity is indirect and arises due to the magnetoelastic coupling, in the form of emergent nematic order, and the strong competition between magnetism and superconductivity.
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                Author and article information

                Journal
                PRBMDO
                Physical Review B
                Phys. Rev. B
                American Physical Society (APS)
                1098-0121
                1550-235X
                July 2011
                July 25 2011
                : 84
                : 2
                Article
                10.1103/PhysRevB.84.020509
                © 2011

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