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; Pulsed-field NMR study on single crystals up to 56 TTokunaga, Yo; Orlova, A.*; Bruyant, N.*; Aoki, Dai*; Mayaffre, H.*; Kr
mer, S.*; Julien, M.-H.*; Berthier, C.*; Horvati
, M.*; Higa, Nonoka; et al.
Physical Review B, 99(8), p.085142_1 - 085142_5, 2019/02
Times Cited Count：7 Percentile：34.12(Materials Science, Multidisciplinary)The heavy-fermion antiferromagnet CeIn exhibits a field-induced anomaly associated with Fermi surface reconstruction at 
45 T, well below the antiferromagnetic (AFM) critical field that exceeds 60 T. In order to explore the origin of this anomaly, we have measured 
In NMR spectra in pulsed magnetic fields up to 56 T using high-quality single crystals. To within experimental resolution, we do not detect any change in the NMR spectra that could suggest a modification in either the character of the hyperfine field or the electric field gradient at In sites through 
. This strongly suggests that the 45 T anomaly cannot be simply ascribed to a field-induced change in the magnetic structure of the AFM state.
Onuki, Yoshichika; Settai, Rikio*; Sugiyama, Kiyohiro*; Takeuchi, Tetsuya*; Honda, Fuminori*; Haga, Yoshinori; Yamamoto, Etsuji; Matsuda, Tatsuma; Tateiwa, Naoyuki; Aoki, Dai*; et al.
Journal of the Korean Physical Society, 63(3), p.409 - 415, 2013/08
Times Cited Count：2 Percentile：19.62(Physics, Multidisciplinary)Onuki, Yoshichika; Settai, Rikio*; Takeuchi, Tetsuya*; Sugiyama, Kiyohiro*; Honda, Fuminori*; Haga, Yoshinori; Yamamoto, Etsuji; Matsuda, Tatsuma; Tateiwa, Naoyuki; Aoki, Dai*; et al.
Journal of the Physical Society of Japan, 81(Suppl.B), p.SB001_1 - SB001_18, 2012/12
Aoki, Dai*; Taupin, M.*; Paulsen, C.*; Hardy, F.*; Taufour, V.*; Kotegawa, Hisashi*; Hassinger, E.*; Malone, L.*; Matsuda, Tatsuma; Miyake, Atsushi*; et al.
Journal of the Physical Society of Japan, 81(Suppl.B), p.SB002_1 - SB002_6, 2012/12
Times Cited Count：3 Percentile：26.20(Physics, Multidisciplinary)
SiAoki, Dai*; Knebel, G.*; Sheikin, I.*; Hassinger, E.*; Malone, L.*; Matsuda, Tatsuma; Flouquet, J.*
Journal of the Physical Society of Japan, 81(7), p.074715_1 - 074715_6, 2012/07
Times Cited Count：24 Percentile：73.76(Physics, Multidisciplinary)Aoki, Dai*; Sheikin, I.*; Matsuda, Tatsuma; Taufour, V.*; Knebel, G.*; Flouquet, J.*
Journal of the Physical Society of Japan, 80(1), p.013705_1 - 013705_4, 2011/01
Times Cited Count：33 Percentile：79.31(Physics, Multidisciplinary)We succeeded in growing high quality single crystals of the ferromagnetic superconductor UCoGe and measured the magnetoresistance at fields up to 34 T. The Shubnikov-de Haas signal was observed for the first time in a U-111 system (UTGe, UTSi, T: transition metal). A small pocket Fermi surface (
1 kT) with large cyclotron effective mass 25
was detected at high fields above 22 T, implying that UCoGe is a low carrier system accompanied with heavy quasi-particles. The observed frequency decreases with increasing fields, indicating that the volume of detected Fermi surface changes nonlinearly with field. The cyclotron mass also decreases, which is consistent with the decrease of the 
coefficient of resistivity.
; High-field phase diagram near an antiferromagnetic QCPTokunaga, Yo; Orlova, A.*; Bruyant, N.*; Aoki, Dai*; Mayaffre, H.*; Krmer, S.*; Julien, M.-H.*; Berthier, C.*; Horvati, M.*; Sakai, Hironori; et al.
no journal, ,
In order to understand the origin of the field-induced anomaly observed in the heavy-fermion metal CeIn at about 45 T, well before the antiferromagnetic critical field, we have performed a pulsed magnetic field In-NMR study using a single crystal up to 56 Tesla. We confirmed that there is no obvious change of hyperfine fields at In sites even above 45 T. This indicates that there is no structural change at high fields, and further, denies simple explanations of the anomaly as due to a field-induced change of the magnetic structure in CeIn.
