A neutron scattering study of the interplay between structure and magnetism in Ba(Fe1&#8722xCox)2As2

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Single crystal neutron diffraction is used to investigate the magnetic and structural phase diagram of the electron doped superconductor Ba(Fe{sub 1-x}Co{sub x}){sub 2}As{sub 2}. Heat capacity and resistivity measurements have demonstrated that Co doping this system splits the combined antiferromagnetic and structural transition present in BaFe{sub 2}As{sub 2} into two distinct transitions. For x=0.025, we find that the upper transition is between the high-temperature tetragonal and low-temperature orthorhombic structures with (T{sub TO} = 99 {+-} 0.5 K) and the antiferromagnetic transition occurs at T{sub AF} = 93 {+-} 0.5 K. We find that doping rapidly suppresses the antiferromagnetism, with antiferromagnetic ... continued below

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Lester, C. June 2, 2010.

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Single crystal neutron diffraction is used to investigate the magnetic and structural phase diagram of the electron doped superconductor Ba(Fe{sub 1-x}Co{sub x}){sub 2}As{sub 2}. Heat capacity and resistivity measurements have demonstrated that Co doping this system splits the combined antiferromagnetic and structural transition present in BaFe{sub 2}As{sub 2} into two distinct transitions. For x=0.025, we find that the upper transition is between the high-temperature tetragonal and low-temperature orthorhombic structures with (T{sub TO} = 99 {+-} 0.5 K) and the antiferromagnetic transition occurs at T{sub AF} = 93 {+-} 0.5 K. We find that doping rapidly suppresses the antiferromagnetism, with antiferromagnetic order disappearing at x {approx} 0.055. However, there is a region of co-existence of antiferromagnetism and superconductivity. The effect of the antiferromagnetic transition can be seen in the temperature dependence of the structural Bragg peaks from both neutron scattering and x-ray diffraction. We infer from this that there is strong coupling between the antiferromagnetism and the crystal lattice.

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  • Journal Name: Submitted to Physical Review B

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  • Report No.: SLAC-PUB-14046
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 981374
  • Archival Resource Key: ark:/67531/metadc1015541

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  • June 2, 2010

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  • Oct. 14, 2017, 8:36 a.m.

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  • Nov. 3, 2017, 1:28 p.m.

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Lester, C. A neutron scattering study of the interplay between structure and magnetism in Ba(Fe1&#8722xCox)2As2, article, June 2, 2010; [California]. (digital.library.unt.edu/ark:/67531/metadc1015541/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.