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Quenched Fe moment in the collapsed tetragonal phase of Ca1-xPrxFe2As2 |
| Ma Long (马龙)a, Gi Gao-Feng (吉高峰)a, Dai Jia (代佳)a, Saha S Rb, Drye Tb, Paglione Jb, Yu Wei-Qiang (于伟强)a |
a Department of Physics, Renmin University of China, Beijing 100872, China;
b Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD 20742, USA |
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Abstract We report 75As NMR studies on single crystals of rare-earth doped iron pnictide superconductor Ca1-xPrxFe2As2. In both cases of x=0.075, 0.15, a large increase of νq upon cooling is consistent with the tetragonal-collapsed tetragonal structure transition. A sharp drop of the Knight shift is also seen just below the structural transition, which suggests the quenching of Fe local magnetism, and therefore offers important understanding of the collapsed tetragonal phase. At even low temperatures, the 1/75T1 is enhanced and forms a peak at T≈ 25 K, which may be caused by the magnetic ordering of the Pr3+ moments or spin dynamics of mobile domain walls.
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Received: 27 February 2013
Revised: 12 March 2013
Accepted manuscript online:
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PACS:
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74.70.Xa
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(Pnictides and chalcogenides)
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74.25.nj
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(Nuclear magnetic resonance)
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76.60.-k
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(Nuclear magnetic resonance and relaxation)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11074304 and 11222433), the National Basic Research Program of China (Grant Nos. 2010CB923004 and 2011CBA00112). Work at UMD supported by AFOSR-MURI (Grant No. FA9550-09-1-0603). |
Corresponding Authors:
Yu Wei-Qiang
E-mail: wqyu_phy@ruc.edu.cn
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Cite this article:
Ma Long (马龙), Gi Gao-Feng (吉高峰), Dai Jia (代佳), Saha S R, Drye T, Paglione J, Yu Wei-Qiang (于伟强) Quenched Fe moment in the collapsed tetragonal phase of Ca1-xPrxFe2As2 2013 Chin. Phys. B 22 057401
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