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Nematicity and magnetism in LaFeAsO single crystals probed by As 75 nuclear magnetic resonance

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Title
Nematicity and magnetism in LaFeAsO single crystals probed by As 75 nuclear magnetic resonance
Author(s)
J. M. Ok; Baek S.-H.; Efremov D.V.; Kappenberger R.; Aswartham S.; J. S. Kim; Van Den Brink J.; Büchner B.
Publication Date
2018-05
Journal
PHYSICAL REVIEW B, v.97, no.18, pp.180405 -
Publisher
AMER PHYSICAL SOC
Abstract
We report a As75 nuclear magnetic resonance study in LaFeAsO single crystals, which undergoes nematic and antiferromagnetic transitions at Tnem∼156 K and TN∼138 K, respectively. Below Tnem, the As75 spectrum splits sharply into two for an external magnetic field parallel to the orthorhombic a or b axis in the FeAs planes. Our analysis of the data demonstrates that the NMR line splitting arises from an electronically driven rotational symmetry breaking. The As75 spin-lattice relaxation rate as a function of temperature shows that spin fluctuations are strongly enhanced just below Tnem. These NMR findings indicate that nematic order promotes spin fluctuations in magnetically ordered LaFeAsO, as observed in nonmagnetic and superconducting FeSe. We conclude that the origin of nematicity is identical in both FeSe and LaFeAsO regardless of whether or not a long-range magnetic order develops in the nematic state. © 2018 American Physical Society
URI
http://pr.ibs.re.kr/handle/8788114/4507
DOI
10.1103/PhysRevB.97.180405
ISSN
2469-9950
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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