Emergent Antiferromagnetism out of the "Hidden-Order" State in URu2Si2: High Magnetic Field Nuclear Magnetic Resonance to 40 T

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Sakai, H. ; Tokunaga, Y. ; Kambe, S. ; Urbano, R. R. ; Suzuki, M. -T. ; Kuhns, P. L. ; Reyes, A. P. ; Tobash, P. H. ; Ronning, F. ; Bauer, E. D. ; Thompson, J. D.

• Tipo de documento: Artigo Científico
• Fonte: Physical Review Letters; v. 112, n. 23, p. 5-pg., 2014-06-10.

Resumo

Very high field Si-29-NMR measurements using a fully Si-29-enriched URu2Si2 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 Si-29 shift, K-29(c) Moreover, a strong enhancement of K-29(c) develops near a critical field H-c similar or equal to 35.6 T, and the Si-29-NMR signal disappears suddenly at H-c, indicating the total suppression of the HO state. Nevertheless, a weak and shifted Si-29-NMR signal reappears for fields higher than H-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. (AU)

• Processo FAPESP: 12/05903-6 - Ressonância magnética nuclear de novos materiais complexos e avançados em física da matéria condensada
• Beneficiário: Ricardo Rodrigues Urbano
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores