Contrasting Spin Dynamics Between Underdoped and Overdoped Ba(Fe[1-x]Co[x])2As2

F. L. Ning; K. Ahilan; T. Imai; A. S. Sefat; M. A. McGuire; B. C. Sales; D. Mandrus; P. Cheng; B. Shen; H. -H Wen

doi:10.1103/PhysRevLett.104.037001

Contrasting Spin Dynamics Between Underdoped and Overdoped Ba(Fe[1-x]Co[x])2As2

Superconductivity 2010-01-25 v3 Strongly Correlated Electrons

Authors: F. L. Ning , K. Ahilan , T. Imai , A. S. Sefat , M. A. McGuire , B. C. Sales , D. Mandrus , P. Cheng , B. Shen , H. -H Wen

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Abstract

We report the first NMR investigation of spin dynamics in the overdoped non-superconducting regime of Ba(Fe[1-x]Co[x])2As2 up to x =0.26. We demonstrate that the absence of inter-band transitions with large momentum transfer Q(AF) ~ (pi, 0) between the hole and electron Fermi surfaces results in complete suppression of antiferromagnetic spin fluctuations for x > 0.15. Our experimental results provide direct evidence for a correlation between Tc and the strength of Q(AF) antiferromagnetic spin fluctuations.

Keywords

spin dynamics NMR Ba(Fe[1-x]Co[x])2As2 overdoped regime antiferromagnetic spin fluctuations Fermi surface superconductivity

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@article{arxiv.0907.3875,
  title  = {Contrasting Spin Dynamics Between Underdoped and Overdoped Ba(Fe[1-x]Co[x])2As2},
  author = {F. L. Ning and K. Ahilan and T. Imai and A. S. Sefat and M. A. McGuire and B. C. Sales and D. Mandrus and P. Cheng and B. Shen and H. -H Wen},
  journal= {arXiv preprint arXiv:0907.3875},
  year   = {2010}
}

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Accepted for publication in Phys. Rev. Lett

Contrasting Spin Dynamics Between Underdoped and Overdoped Ba(Fe[1-x]Co[x])2As2

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