title: Emergent antiferromagnetism out of the "hidden-order" state in URu2Si2: high magnetic field nuclear magnetic resonance to 40 T.
abstract: Very high field (29)Si-NMR measurements using a fully (29)Si-enriched URu(2)Si(2) 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(c) ≃ 35.6 T, and the ^{29}Si-NMR signal disappears suddenly at H(c), indicating the total suppression of the HO state. Nevertheless, a weak and shifted (29)Si-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.
authors: Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan.
authors: H
authors: H
authors: Sakai
authors: Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan.
authors: Y
authors: Y
authors: Tokunaga
authors: Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan.
authors: S
authors: S
authors: Kambe
authors: Instituto de Física "Gleb Wataghin", Universidade Estadual de Campinas, 13083-859 Campinas, SP, Brazil and National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA.
authors: R R
authors: RR
authors: Urbano
authors: CCSE, Japan Atomic Energy Agency, 5-1-5, Kashiwanoha, Kashiwa, Chiba 277-8587, Japan.
authors: M-T
authors: MT
authors: Suzuki
authors: National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA.
authors: P L
authors: PL
authors: Kuhns
authors: National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA.
authors: A P
authors: AP
authors: Reyes
authors: Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors: P H
authors: PH
authors: Tobash
authors: Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors: F
authors: F
authors: Ronning
authors: Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors: E D
authors: ED
authors: Bauer
authors: Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors: J D
authors: JD
authors: Thompson