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

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 s...

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Bibliographic Details
Published in:中国物理B：英文版 2013 (5), p.55-59
Main Author: 马龙 吉高峰 代佳 Saha S R Drye T Paglione J 于伟强
Format: Article
Language:English
Subjects:
倒塌
四方相
核磁共振
淬火
磁性铁
稀土掺杂
结构转变
超导体
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Summary: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.
ISSN:1674-1056
2058-3834