Crystalline Electric Field as a Probe for Long-Range Antiferromagnetic Order and Superconducting State of CeFeAsO1-xFx

被引:53
作者
Chi, Songxue [1 ]
Adroja, D. T. [3 ]
Guidi, T. [3 ]
Bewley, R. [3 ]
Li, Shiliang [1 ]
Zhao, Jun [1 ]
Lynn, J. W. [2 ]
Brown, C. M. [2 ]
Qiu, Y. [2 ,4 ]
Chen, G. F. [5 ]
Lou, J. L. [5 ]
Wang, N. L. [5 ]
Dai, Pengcheng [1 ,6 ]
机构
[1] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA
[2] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA
[3] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England
[4] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA
[5] Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China
[6] Oak Ridge Natl Lab, Neutron Scattering Sci Div, Oak Ridge, TN 37831 USA
关键词
D O I
10.1103/PhysRevLett.101.217002
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We use inelastic neutron scattering to study the crystalline electric field (CEF) excitations of Ce(3+) in CeFeAsO(1-x)F(x) (x=0, 0.16). For nonsuperconducting CeFeAsO, the Ce CEF levels have three magnetic doublets in the paramagnetic state, but these doublets split into six singlets when the Fe ions order antiferromagnetically. For superconducting CeFeAsO(0.84)F(0.16) (T(c)=41 K), where the static antiferromagnetic order is suppressed, the Ce CEF levels have three magnetic doublets at h omega=0, 18.7, 58.4 meV at all temperatures. Careful measurements of the intrinsic linewidth Gamma and the peak position of the 18.7 meV mode reveal a clear anomaly at T(c), consistent with a strong enhancement of local magnetic susceptibility chi('')(h omega) below T(c). These results suggest that CEF excitations in the rare-earth oxypnictides can be used as a probe of spin dynamics in the nearby FeAs planes.
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页数:4
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