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

被引：161
作者：
Ning, Fanlong [1 ]
Ahilan, Kanagasingham [1 ]
Imai, Takashi [1 ,2 ]
Sefat, Athena S. [3 ]
Jin, Ronying [3 ]
McGuire, Michael A. [3 ]
Sales, Brian C. [3 ]
Mandrus, David [3 ]
机构：
[1] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada
[2] Canadian Inst Adv Res, Toronto, ON M5G 1Z8, Canada
[3] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA
来源：
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2009年 / 78卷 / 01期
基金：
加拿大自然科学与工程研究理事会;
关键词：
iron pnictide superconductor; high temperature superconductivity; NMR; quantum criticality; DYNAMICS; ORDER;
D O I：
10.1143/JPSJ.78.013711
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report a systematic investigation of Ba(Fe1-xCox)(2)As-2 based on transport and As-75 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) similar or equal to 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.
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页数：4
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