Spin Susceptibility, Phase Diagram, and Quantum Criticality in the Electron-Doped High Tc Superconductor Ba(Fe1-xCox)2As2

Journal Article · Thu Jan 01 04:00:00 EST 2009 · Journal of the Physical Society of Japan

DOI:https://doi.org/10.1143/JPSJ.78.013711· OSTI ID:965851

Ning, F. L. ^[1]; Ahilan, K. ^[1]; Imai, T. ^[1]; Safa-Sefat, Athena ^[2]; Jin, Rongying ^[2]; McGuire, Michael A ^[2]; Sales, Brian C ^[2]; Mandrus, David ^[2]

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1. McMaster University
2. ORNL

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 from a non-Fermi-liquid which exhibits T-linear resistivity. Our findings point toward the presence of a quantum critical point near xc between the SDW (spin density wave) and superconducting phases.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 965851
• Journal Information: Journal of the Physical Society of Japan, Journal Name: Journal of the Physical Society of Japan Journal Issue: 1 Vol. 78; ISSN JUPSAU; ISSN 0031-9015
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ARSENIDES
BARIUM COMPOUNDS
COBALT ARSENIDES
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
HIGH-TC SUPERCONDUCTORS
IRON ARSENIDES
MAGNETIC SUSCEPTIBILITY
PHASE DIAGRAMS
SPIN