Issue
EPL
Volume 86, Number 3, May 2009
Article Number 37006
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/86/37006
Published online 18 May 2009
EPL, 86 (2009) 37006
DOI: 10.1209/0295-5075/86/37006

Universal linear-temperature dependence of static magnetic susceptibility in iron pnictides

G. 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

gmzhang@tsinghua.edu.cn

received 11 November 2008; accepted in final form 17 April 2009; published May 2009
published online 18 May 2009

Abstract
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.

PACS
74.25.Ha - Magnetic properties.
71.27.+a - Strongly correlated electron systems; heavy fermions.
75.30.Fv - Spin-density waves.

© EPLA 2009