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Yamauchi, Hiroki; Metoki, Naoto; Watanuki, Ryuta*; Suzuki, Kazuya*; Fukazawa, Hiroshi; Chi, S.*; Fernandez-Baca, J. A.*
Journal of the Physical Society of Japan, 86(4), p.044705_1 - 044705_9, 2017/04
Times Cited Count：14 Percentile：65.98(Physics, Multidisciplinary)Neutron diffraction experiments have been carried out to characterize the magnetic structures and order parameters in an intermediate phase of NdB showing the successive phase transitions at 
K, 
K, and 
K. The observed patterns in phase II (
) are successfully explained by postulating a planar structure with static magnetic moments in the tetragonal 
-plane. We have found that the magnetic structure in phase II can be uniquely determined to be a linear combination of noncolinear "all-in/all-out"-type and "vortex"-type antiferromagnetic structures. We propose that the quadrupolar interaction holds the key to stabilizing the noncollinear magnetic structure and quadrupolar order. Here, the frustration in the Shastry - Sutherland lattice would play an essential role in suppressing the dominance of the magnetic interaction.
Sb
Kuwahara, Keitaro*; Iwasa, Kazuaki*; Kogi, Masafumi*; Kaneko, Koji; Metoki, Naoto; Raymond, S.*; M
asson, M.-A.*; Flouquet, J.*; Sugawara, Hitoshi*; Aoki, Yuji*; et al.
Physica B; Condensed Matter, 385-386(Part 1), p.82 - 84, 2006/11
Times Cited Count：3 Percentile：17.95(Physics, Condensed Matter)We report inelastic neutron scattering experiments performed to investigate the low energy magnetic excitations on single crystals of the heavy-fermion superconductor PrOsSb. The observed excitation clearly softens at a wave vector Q=(1,0,0), which is the same as the modulation vector of the field-induced antiferro-quadrupolar ordering, and its intensity at Q=(1,0,0) is smaller than that around the zone center. This result directly evidences that this excitonic behavior is derived mainly from nonmagnetic quadrupolar interactions. Furthermore, the narrowing of the linewidths of the excitations below the superconducting transition temperature indicates the close connection between the superconductivity and the excitons.
SbKaneko, Koji; Metoki, Naoto; Matsuda, Tatsuma; Kuwahara, Keitaro*; Kogi, Masafumi*; Shiina, Ryosuke*; Mignot, J.-M.*; Gukasov, A.*; Bernhoeft, N.*
Physica B; Condensed Matter, 378-380, p.189 - 191, 2006/05
Times Cited Count：1 Percentile：6.63(Physics, Condensed Matter)Neutron diffraction experiments under magnetic fields were carried out on the heavy fermion superconductor PrOsSb in order to reveal the origin of the field-induced ordered phase (FIOP) for 
[1,1,0]. The application of magnetic field induces the weak superlattice peaks with the ordering vector 
=(1,0,0) in FIOP, which is the same as for 
[0,0,1]. The observed superlattice reflections for [1,1,0] result from the antiferromagnetic component of 
+
; the induced tiny antiferromagnetic moments orient parallel to the applied field. This result cannot be explained by magnetic interactions and strongly evidences the underlying AFQ order with 
as a primary order parameter. These facts clarify the dominant role of -type antiferroquadrupolar interaction in PrOsSb.
COyama, Kenji*; Kaneko, Koji; Onimaru, Takahiro*; Tobo, Aya*; Ishimoto, Kenichi*; Onodera, Hideya*; Yamaguchi, Yasuo*
Journal of the Physical Society of Japan, 72(12), p.3303 - 3304, 2003/12
Times Cited Count：6 Percentile：42.96(Physics, Multidisciplinary)no abstracts in English
