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Quenched Fe moment in the collapsed tetragonal phase of Cal-xPrxFe2As2

ISSN号：1674-1056
期刊名称：《中国物理B：英文版》
时间：0
分类：O631.1[理学—高分子化学;理学—化学] TD924.1[矿业工程—选矿]
作者机构：[1]Department of Physics, Renmin University of China, Beijing 100872, China, [2]Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD 20742, USA
相关基金：Project supported by the National Natural Science Foundation of China （Grant Nos. 11074304 and 11222433） and the National Basic Research Program of China （Grant Nos. 2010CB923004 and 2011CBA00112）. Work at the University of Maryland supported by AFOSR-Multidisciplinary University, Research Initiative （Grant No. FA9550-09-1-0603）.

作者：马龙[1], 吉高峰[1], 代佳[1], Saha S R[2], Drye T[2], Paglione J[2], 于伟强[1]

关键词：磁性铁, 四方相, 倒塌, 淬火, 结构转变, 稀土掺杂, 核磁共振, 超导体, quenched Fe moment, collapsed tetragonal phase, iron pnictides, nuclear magnetic resonance

中文摘要：

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 structure 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.

英文摘要：

We report 7SAs 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 Vq upon cooling is consistent with the tetragonal-collapsed tetragonal structure transition. A sharp drop of the Knight shift is also seen just below the structure transition, which suggests the quenching of Fe local magnetism, and therefore offers important understanding of the collapsed tetragonal phase. At even low temperatures, the 1/75 T1 is enhanced and forms a peak at T ≈ 25 K, which may be caused by the magnetic ordering of the Pr3＋ moments or soin dynamics of mobile domain walls.

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