Interplay of superconductivity and d-f correlation in CeFeAs1-xPxO1-yFy

doi:10.1088/1674-1056/22/8/087415

Abstract The recent discovery of high-temperature superconductivity in iron-based pnictides (chalcogenides) not only triggers tremendous enthusiasm in searching for new superconducting materials, but also opens a new avenue to the study of the Kondo physics. CeFeAsO is a parent compound of the 1111-type iron-based superconductors. It shows 3d-antiferromagnetic (AFM) ordering below ～139 K and 4f-AFM ordering below ～4 K. On the other hand, the phosphide CeFePO is a ferromagnetically correlated heavy-fermion (HF) metal with Kondo scale T_K～10 K. These properties set up a new platform for research of the interplay among magnetism, Kondo effect, and superconductivity (SC). In this review, we present the recent progress in the study of chemical pressure effect in CeFeAsO_1-yF_y (y=0 and 0.05). This P/As-doping in CeFeAsO serves as an effective controlling parameter which leads to two magnetic critical points, x_c1≈0.4 and x_c2≈0.92, associated with suppression of 3d and 4f magnetism, respectively. We also observe a turning point of AFM-FM ordering of Ce³⁺ moment at x_c3≈0.37. The SC is absent in the phase diagram, which is attributed to the destruction to Cooper pair by Ce-FM fluctuations in the vicinity of x_c1. We continue to investigate CeFeAs_1-xP_xO_0.95F_0.05. With the separation of x_c1 and x_c3, this chemical pressure results in a broad SC region 0≤x≤q 0.53, while the original HF behavior is driven away by 5% F^- doping. Different roles of P and F dopings are addressed, and the interplay between SC and Ce-4f magnetism is also discussed.

Keywords: superconductivity iron-based pnictide Kondo effect heavy fermion quantum critical point chemical pressure effect

Received: 08 June 2013
Revised: 15 July 2013
Accepted manuscript online:

PACS:	74.70.Xa	(Pnictides and chalcogenides)
	74.62.Fj	(Effects of pressure)
	74.40.Kb	(Quantum critical phenomena)
	75.20.Hr	(Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions)

Fund: Project supported by the National Basic Research Program of China (Grant Nos. 2011CBA00103 and 2010CB923003) and the National Natural Science Foundation of China.

Corresponding Authors: Xu Zhu-An
E-mail: zhuan@zju.edu.cn

Cite this article:

Luo Yong-Kang (罗永康), Li Yu-Ke (李玉科), Wang Cao (王操), Lin Xiao (林效), Dai Jian-Hui (戴建辉), Cao Guang-Han (曹光旱), Xu Zhu-An (许祝安) Interplay of superconductivity and d-f correlation in CeFeAs_1-xP_xO_1-yF_y 2013 Chin. Phys. B 22 087415

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Interplay of superconductivity and d-f correlation in CeFeAs1-xPxO1-yFy

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Interplay of superconductivity and d-f correlation in CeFeAs_1-xP_xO_1-yF_y