Universal linear-temperature dependence of static magnetic susceptibility in iron pnictidesG. M. Zhang1, Y. H. Su2, Z. Y. Lu3, Z. Y. Weng4, D. H. Lee5 and T. Xiang6, 7
1 Department of Physics, Tsinghua University - Beijing 100084, China
2 Department of Physics, Yantai University - Yantai 264005, China
3 Department of Physics, Renmin University of China - Beijing 100872, China
4 Center for Advanced Study, Tsinghua University - Beijing 100084, China
5 Department of Physics, University of California at Berkeley - Berkeley, CA 94720, USA
6 Institute of Physics, Chinese Academy of Sciences - Beijing 100190, China
7 Institute of Theoretical Physics, Chinese Academy of Sciences - Beijing 100190, China
received 11 November 2008; accepted in final form 17 April 2009; published May 2009
published online 18 May 2009
A universal linear-temperature dependence of the uniform magnetic susceptibility has been observed in the non-magnetic normal state of iron pnictides. This non-Pauli and non-Curie-Weiss-like paramagnetic behavior cannot be understood within a simple mean-field picture. We argue that it results from the existence of a wide antiferromagnetic fluctuation window in which the local spin-density-wave correlations exist but the global directional order has not been established yet.
74.25.Ha - Magnetic properties.
71.27.+a - Strongly correlated electron systems; heavy fermions.
75.30.Fv - Spin-density waves.
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