Emergent antiferromagnetism out of the "hidden-order" state in URuSi; High magnetic field nuclear magnetic resonance to 40 T

Sakai, Hironori ; Urbano, R. R.*; Tokunaga, Yo ; Kambe, Shinsaku ; Suzuki, Michito; Kuhns, P. L.*; Reyes, A. P.*; Tobash, P. H.*; Ronning, F.*; Bauer, E. D.*; Thompson, J. D.*

Very high field $^{29}$ Si-NMR measurements using a fully $^{29}$ Si-enriched URuSi single crystal were carried out in order to microscopically investigate the "hidden order" (HO) state and adjacent magnetic phases in the high field limit. At the lowest measured temperature of 0.4 K, a clear anomaly reflecting a Fermi surface instability near 22 T inside the HO state is detected by the $^{29}$ Si shift, $^{29}K_c$ . Moreover, a strong enhancement of $^{29}K_c$ develops near a critical field $H_{rm c}simeq 35.6$ T, and the $^{29}$ Si-NMR signal disappears suddenly at $H_{rm c}$ , indicating the total suppression of the HO state. Nevertheless, a weak and shifted $^{29}$ Si-NMR signal reappears for fields higher than $H_{rm c}$ at 4.2 K, providing evidence for a magnetic structure within the magnetic phase caused by the Ising-type anisotropy of the uranium ordered moments.

Language	:	English
Journal	:	Physical Review Letters
Volume	:	112
Number	:	23
Pages	:	p.236401_1 - 236401_5
Publication Year/Month	:	2014/06
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Paper URL	:	https://doi.org/10.1103/PhysRevLett.112.236401
DOI for research data	:	Link to research data related to this paper/report.
Keywords	:	no keyword
Research Facility	:	第4研究棟
Press Release	:	強磁場で引き出されたウラン化合物の特異な磁性; 世界最高磁場で核磁気共鳴法を応用
Article of JAEA R&D Review	:	Novel Magnetism in Uranium Compound Revealed by World's Strongest Magnet; High-Field Magnetic Structure in URu $_{2}$ Si $_{2}$ Observed via Nuclear Magnetic Resonance[/]
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Registration No. : AA20140124
JAEA Abstracts No. : 42000994
Paper Submission No. : 14654

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