Ubiquity of amplitude-modulated magnetic ordering in the H − T phase diagram of the frustrated non-Fermi-liquid YbAgGe

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dc.contributor.authorLarsen, CBen_AU
dc.contributor.authorCanévet, Een_AU
dc.contributor.authorMazzone, DGen_AU
dc.contributor.authorRüegg, Cen_AU
dc.contributor.authorFåk, Ben_AU
dc.contributor.authorMcMorrow, DFen_AU
dc.contributor.authorRessouche, Een_AU
dc.contributor.authorMcIntyre, GJen_AU
dc.contributor.authorBud'ko, SLen_AU
dc.contributor.authorCanfield, PCen_AU
dc.contributor.authorZaharko, Oen_AU
dc.date.accessioned2021-12-17T00:14:35Zen_AU
dc.date.available2021-12-17T00:14:35Zen_AU
dc.date.issued2021-08-17en_AU
dc.date.statistics2021-11-25en_AU
dc.description.abstractYbAgGe contains a magnetic geometrically frustrated kagome-like lattice that also features significant local single-ion anisotropy. The electronic state is established by hybridization of 4f and conduction electrons leading to heavy electronic masses. The competition between these various interactions leads to nontrivial behavior under external magnetic field, including a sequence of magnetic phase transitions, non-Fermi-liquid states, and possibly a quantum critical point. We present a series of neutron diffraction experiments performed in the mK temperature range and under magnetic fields up to 8 T in the hexagonal plane, revealing the microscopic nature of the first four subsequent magnetic states of this phase diagram. The magnetic phases are associated with the propagation vectors k1 = (13 0 13) for H<2 T, k2 = (0 0 0.32) for 2 T < H<3 T, k1=(13 0 13) for 3 T < H<4.5 T, and k3=(0.1950.1950.38) for 4.5 T < H<7 T. Our structural refinements reveal a strong modulation of he magnetic moment amplitude in all phases. We observe that the ordered moments of the three magnetically different Yb sites become increasingly different in field, which complies with the principle local anisotropy directions relative to the field direction. While the ordered moments are aligned predominantly in the hexagonal lane, we also find a significant out-of-plane component and a ferromagnetic contribution above 2 T. We discuss possible scenarios that may evolve around the phase boundary at 4.5 T, which is associated with putative quantum criticality as identified by various bulk probes. We propose further steps that are required to better understand the microscopic interactions in this material. ©2021 American Physical Societyen_AU
dc.identifier.articlenumber54424en_AU
dc.identifier.citationLarsen, C. B., Canévet, E., Mazzone, D. G., Rüegg, C., Fåk, B., McMorrow, D. F., Ressouche, E., McIntyre, G. J., Bud'ko, S. L., Canfield, P. C., & Zaharko, O. (2021). Ubiquity of amplitude-modulated magnetic ordering in the H − T phase diagram of the frustrated non-Fermi-liquid YbAgGe. Physical Review B,104(5), 054424. doi:10.1103/PhysRevB.104.054424en_AU
dc.identifier.issn2469-9969en_AU
dc.identifier.issue5en_AU
dc.identifier.journaltitlePhysical Review Ben_AU
dc.identifier.urihttps://doi.org/10.1103/PhysRevB.104.054424en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12521en_AU
dc.identifier.volume104en_AU
dc.language.isoenen_AU
dc.publisherAmerican Physical Societyen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectPhase transformationsen_AU
dc.subjectMagnetic propertiesen_AU
dc.subjectAnisotropyen_AU
dc.subjectFerromagnetismen_AU
dc.subjectMagnetic momentsen_AU
dc.titleUbiquity of amplitude-modulated magnetic ordering in the H − T phase diagram of the frustrated non-Fermi-liquid YbAgGeen_AU
dc.typeJournal Articleen_AU
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