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J. Phys. Soc. Jpn. 78 (2009) 013711 (4 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Spin Susceptibility, Phase Diagram, and Quantum Criticality in the Eelctron-Doped High Tc Superconductor Ba(Fe1-xCox)2As2

Fanlong Ning1, Kanagasingham Ahilan1, Takashi Imai1,2, Athena S. Sefat3, Ronying Jin3, Michael A. McGuire3, Brian C. Sales3, and David Mandrus3

1Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S4M1, Canada
2Canadian Institute for Advanced Research, Toronto, Ontario M5G1Z8, Canada
3Materials Science and Technology Division, Oak Ridge National Laboratory, TN 37831, U.S.A.

(Received November 11, 2008; Accepted December 9, 2008; Published January 13, 2009)

We report a systematic investigation of Ba(Fe1-xCox)2As2 based on transport and 75As NMR measurements, and establish the electronic phase diagram. We demonstrate that doping progressively suppresses the uniform spin susceptibility and low frequency spin fluctuations. The optimum superconducting phase emerges at xc ≃0.08 when the tendency toward spin ordering completely diminishes. Our findings point toward the presence of a quantum critical point near xc between the SDW (spin density wave) and superconducting phases. ©2009 The Physical Society of Japan

URL: http://jpsj.ipap.jp/link?JPSJ/78/013711/
DOI: 10.1143/JPSJ.78.013711


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