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Magnetic Phase Diagrams and Spin Hamiltonian of Monoclinic -RuCl from Angle-Dependent Torque Studies
Daniel Antoniou, Danrui Ni, John S. Pearce +3
The layered honeycomb -RuCl has been much explored as a candidate to display unconventional cooperative magnetism between spin-orbit entangled Ru ma…
Angular Modulations in Magnetic Torque Induced by Phase Transitions in the Triangular Supersolid -AgNiO
John S. Pearce, Zeyu Ma, Alimamy Bangura +4
Easy-axis frustrated triangular lattice antiferromagnets provide an important playground for stabilising a wide range of exotic magnetic phases. The delafossite -AgNiO offe…
Field-tuned incommensurate fan phase in an Ising-like triangular antiferromagnet
D. Flavián, R. Okuma, P. Manuel +3
Using single-crystal neutron diffraction we report the observation of a field-tuned incommensurate phase in a field range just below magnetization saturation in the Ising-like tria…
From continuum excitations to sharp magnons via transverse magnetic field in the spin-1/2 Ising-like triangular lattice antiferromagnet Na2BaCo(PO4)2
Leonie Woodland, Ryutaro Okuma, J. Ross Stewart +2
We report high-resolution inelastic neutron scattering measurements of the excitation spectrum in large single crystals of the spin-1/2 triangular lattice Ising-like antiferromagne…
Origin of the insulating state in the Kitaev candidate CuIrO
Ying Li, Roger D. Johnson, Yogesh Singh +2
Through a combination of crystal symmetry analysis and density functional theory calculations we unveil a possible microscopic origin of the unexpected insulating behavior reported…
Selective synthesis and crystal chemistry of candidate rare earth Kitaev materials: honeycomb and hyperhoneycomb NaPrO
Ryutaro Okuma, Kylie MacFarquharson, Radu Coldea
Rare earth oxides have attracted interest as a platform for studying frustrated magnetism arising from bond dependent anisotropic interactions. Ordered rock salt compounds NaPr…
Compass-model physics on the hyperhoneycomb lattice in the extreme spin-orbit regime
Ryutaro Okuma, Kylie MacFarquharson, Roger D. Johnson +3
The physics of spin-orbit entangled magnetic moments of and transition metal ions on a honeycomb lattice has been much explored in search for unconventional magnetic orde…
Anisotropy of the zigzag order in the Kitaev honeycomb magnet -RuBr
John S. Pearce, David A. S. Kaib, Zeyu Ma +5
Kitaev materials often order magnetically at low temperatures due to the presence of non-Kitaev interactions. Torque magnetometry is a very sensitive technique for probing the magn…
Anisotropic magnetic interactions in a candidate Kitaev spin liquid close to a metal-insulator transition
Zeyu Ma, Danrui Ni, David A. S. Kaib +6
In the Kitaev honeycomb model, spins coupled by strongly-frustrated anisotropic interactions do not order at low temperature but instead form a quantum spin liquid with spin fracti…
Tuning the confinement potential between spinons in the Ising chain CoNb2O6 using longitudinal fields and quantitative determination of the microscopic Hamiltonian
Leonie Woodland, David Macdougal, Ivelisse M. Cabrera +4
The Ising chain realizes the fundamental paradigm of spin fractionalization, where locally flipping a spin creates two domain walls (spinons) that can separate apart at no energy c…
Excitations of quantum Ising chain CoNb2O6 in low transverse field: quantitative description of bound states stabilized by off-diagonal exchange and applied field
Leonie Woodland, Izabella Lovas, M. Telling +3
We present experimental and theoretical evidence of novel bound state formation in the low transverse field ordered phase of the quasi-one-dimensional Ising-like material CoNbO…
High-energy spin waves in the spin-1 square-lattice antiferromagnet LaNiO
A. N. Petsch, N. S. Headings, D. Prabhakaran +5
Inelastic neutron scattering is used to study the magnetic excitations of the square-lattice antiferromagnet LaNiO. We find that the spin waves cannot be described by…
Studies on Novel Yb-based Candidate Triangular Quantum Antiferromagnets: Ba3YbB3O9 and Ba3YbB9O18
Hwanbeom Cho, Stephen J. Blundell, Toni Shiroka +3
Yb-based triangular magnets have recently attracted attention as promising candidates to explore frustrated quantum magnetism. However, some candidates have turned out to have sign…
Quantifying and controlling entanglement in the quantum magnet CsCoCl
Pontus Laurell, Allen Scheie, Chiron J. Mukherjee +7
The lack of methods to experimentally detect and quantify entanglement in quantum matter impedes our ability to identify materials hosting highly entangled phases, such as quantum…
Order-by-Disorder from Bond-Dependent Exchange and Intensity Signature of Nodal Quasiparticles in a Honeycomb Cobaltate
M. Elliot, P. A. McClarty, D. Prabhakaran +4
Recent theoretical proposals have argued that cobaltates with edge-sharing octahedral coordination can have significant bond-dependent exchange couplings thus offering a platform i…
Avoided quasiparticle decay and enhanced excitation continuum in the spin-1/2 near-Heisenberg triangular antiferromagnet Ba3CoSb2O9
David Macdougal, Stephanie Williams, Dharmalingam Prabhakaran +3
We explore the magnetic excitations of the spin-1/2 triangular antiferromagnet Ba3CoSb2O9 in its 120 degree ordered phase using single-crystal high-resolution inelastic neutron sca…
Glide symmetry breaking and Ising criticality in the quasi-1D magnet CoNbO
Michele Fava, Radu Coldea, S. A. Parameswaran
We construct a microscopic spin-exchange Hamiltonian for the quasi-1D Ising magnet CoNbO that captures detailed and hitherto-unexplained aspects of its dynamic spin structu…
High-resolution resonant inelastic x-ray scattering study of the electron-phonon coupling in honeycomb -LiIrO
J. G. Vale, C. D. Dashwood, E. Paris +11
The excitations in honeycomb -LiIrO have been investigated with high-resolution resonant inelastic x-ray scattering (RIXS) at the O K edge. The low-energy response is do…
Chemical tuning between triangular and honeycomb structures in a 5 spin-orbit Mott insulator
R. D. Johnson, I. Broeders, K. Mehlawat +4
We report structural studies of the spin-orbit Mott insulator family KIrO, with triangular layers of edge-sharing IrO octahedra bonded by potassium ions. The potass…
Spin dynamics and field-induced magnetic phase transition in the honeycomb Kitaev magnet -LiIrO
Sungkyun Choi, S. Manni, J. Singleton +7
The layered honeycomb iridate -LiIrO displays an incommensurate magnetic structure with counterrotating moments on nearest-neighbor sites, proposed to be stabilized by s…
Spin dynamics of coupled spin ladders near quantum criticality in Ba2CuTeO6
David Macdougal, Alexandra S. Gibbs, Tao Ying +6
We report inelastic neutron scattering measurements of the magnetic excitations in Ba2CuTeO6, proposed by ab initio calculations to magnetically realize weakly coupled antiferromag…
Neutron Scattering Signatures of Magnon Weyl Points
S. Shivam, R. Coldea, R. Moessner +1
We study the inelastic neutron scattering cross section in the vicinity of touching points in magnon bands. Among the possible touching points are magnon Weyl points in three dimen…
Probing -RuCl Beyond Magnetic Order: Effects of Temperature and Magnetic Field
Stephen M. Winter, Kira Riedl, David Kaib +2
Recent studies have brought -RuCl to the forefront of experimental searches for materials realizing Kitaev spin-liquid physics. This material exhibits strongly anisotropic e…
Quasiparticle Breakdown and Spin Hamiltonian of the Frustrated Quantum Pyrochlore YbTiO in Magnetic Field
J. D. Thompson, P. A. McClarty, D. Prabhakaran +3
The frustrated pyrochlore magnet YbTiO has the remarkable property that it orders magnetically, but has no propagating magnons over wide regions of the Brillouin zone.…