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

2008/11/11 by Fanlong Ning, F. L. Ning, K. Ahilan +13 · 4 citations
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1143/jpsj.78.013711

published as J. Phys. Soc. Jpn. 78 (2009) 013711 · 5 Figures

arxiv created 2008/11/11 · openalex publication_date 2009/01/13 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We report a systematic investigation of Ba[Fe(1-x)Co(x)]2As2 based on transport and 75-As 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 x_c~0.08 when the tendency toward spin ordering completely diminishes. Our findings point toward the presence of a quantum critical point near x_c between the SDW (spin density wave) and superconducting phases.

Citations

• Strong Correlations and Magnetic Frustration in the HighTcIron Pnictides
• Superconductivity at 22 K in Co-DopedBaFe2As2Crystals
• Observation of Fermi-surface–dependent nodeless superconducting gaps in Ba 0.6 K 0.4 Fe 2 As 2
• The pseudogap in high-temperature superconductors: an experimental survey

Cited by

• Homogeneous vs. inhomogeneous coexistence of magnetic order and superconductivity probed by NMR in Co- and K-doped iron pnictides
• Symmetry and disorder of the vitreous vortex lattice in overdopedBaFe2−xCoxAs2: Indication for strong single-vortex pinning
• Two-dimensional resonant magnetic excitation inBaFe1.84Co0.16As2
• High Critical Current Density 4 MA/cm2in Co-Doped BaFe2As2Epitaxial Films Grown on (La,Sr)(Al,Ta)O3Substrates without Buffer Layers