Numerical simulations and magnetism

Petit, S.

doi:10.1051/sfn/201112006

Cited by 38 publications

(22 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To study the spin excitations and the effects of quantum fluctuations to the classical ground states, we apply a linear spin-wave theory [15][16][17] in real space by performing a local rotation on each spin S i . The dynamical structure factor are calculated using the spinW codecs 15 .…”

Section: Model and Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Semiclassical ground-state phase diagram andmulti-Qphase of a spin-orbit-coupled model on triangular lattice

Liu

Wang

2016

Phys. Rev. B

View full text Add to dashboard Cite

Motivated by recent experiments on the frustrated quantum magnetic compound YbMgGaO4, we study an effective spin model on triangular lattice taking into account the effects of the spin-orbit coupling. We determine the classical ground-state phase diagram of this model, which includes a 120• Néel and two collinear antiferromagnetic phases. In the vicinity of the phase boundary between the Néel and collinear phases, we identify three intermediate non-collinear antiferromagnetic phases. In each of them the magnetic moments are ordered at multiple incommensurate wave vector Q values. We further study the effects of quantum fluctuations in this model via a linear spin-wave theory. We find that the spin excitation gap of the non-collinear multi-Q antiferromagnetic state is finite but can be vanishingly small, and this state is unstable to a spin liquid phase under strong quantum fluctuations in some large |Jz±| regime.

show abstract

Section: Model and Methodsmentioning

confidence: 99%

“…The method is performed as following [15][16][17] . Suppose that ground state has classical configuration {n ns } where n ns is the unit vector pointing direction of the spin at the site i labeled by magnetic unit cell index n and sublattice index s. Since the spin direction only depends on the sublattice index s, i.e.…”

mentioning

confidence: 99%

Semiclassical ground-state phase diagram andmulti-Qphase of a spin-orbit-coupled model on triangular lattice

Liu

Wang

2016

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…Unless otherwise noted, we modeled the magnetic excitations of CoRh 2 O 4 and CuRh 2 O 4 using the numerical implementation of linear spin-wave theory 45 in the program SpinW. 46 In our simulations, we assume a diagonal form for Heisenberg exchange interactions, i.e.…”

Section: E Spin Dynamics Simulationsmentioning

confidence: 99%

Spin order and dynamics in the diamond-lattice Heisenberg antiferromagnets CuRh2O4 and CoRh2O4
Ge
¹
,
Flynn
²
,
Paddison
³

et al. 2017
Phys. Rev. B
36
12
42
1
View full text Add to dashboard Cite

Antiferromagnetic insulators on the diamond lattice are candidate materials to host exotic magnetic phenomena ranging from spin-orbital entanglement to degenerate spiral ground-states and topological paramagnetism. Compared to other three-dimensional networks of magnetic ions, such as the geometrically frustrated pyrochlore lattice, the investigation of diamond-lattice magnetism in real materials is less mature. In this work, we characterize the magnetic properties of model A-site spinels CoRh2O4 (cobalt rhodite) and CuRh2O4 (copper rhodite) by means of thermo-magnetic and neutron scattering measurements and perform group theory analysis, Rietveld refinement, meanfield theory, and spin wave theory calculations to analyze the experimental results. Our investigation reveals that cubic CoRh2O4 is a canonical S = 3/2 diamond-lattice Heisenberg antiferromagnet with a nearest neighbor exchange J = 0.63 meV and a Néel ordered ground-state below a temperature of 25 K. In tetragonally distorted CuRh2O4, competiting exchange interactions between up to third nearest-neighbor spins lead to the development of an incommensurate spin helix at 24 K with a magnetic propagation vector km = (0, 0, 0.79). Strong reduction of the ordered moment is observed for the S = 1/2 spins in CuRh2O4 and captured by our 1/S corrections to the staggered magnetization. Our work identifies CoRh2O4 and CuRh2O4 as reference materials to guide future work searching for exotic quantum behavior in diamond-lattice antiferromagnets.

show abstract

“…In the spin wave approximation, the elementary excitations, called spin waves, correspond to precession motions of the spins around the magnetization direction [12][13][14][15][16][17]. These spin waves are free particles carrying a spin 1.…”

Section: Spin Wavesmentioning

confidence: 99%

Inelastic neutron scattering

Petit

2017

EPJ Web Conf.

View full text Add to dashboard Cite

Abstract. The goal of the JDN22 school was to propose a progressive teaching eager to improve the expertise of students in neutron diffraction. Neutron-based techniques have indeed proved for decades to be essential tools in the investigation of condensed matter. This lecture is however concerned with inelastic neutron scattering and is thus somehow apart. In the context of this school, it should then only be considered as a brief introduction. We give simple examples along with the basics of the spectrometers, and finally useful formula for the inelastic cross sections in different situations. We strongly encourage interested readers to refer to the bibliography for more detailed information.

show abstract

Numerical simulations and magnetism

Cited by 38 publications

References 18 publications

Semiclassical ground-state phase diagram andmulti-Qphase of a spin-orbit-coupled model on triangular lattice

Semiclassical ground-state phase diagram andmulti-Qphase of a spin-orbit-coupled model on triangular lattice

Spin order and dynamics in the diamond-lattice Heisenberg antiferromagnets CuRh2O4 and CoRh2O4
Ge
¹
,
Flynn
²
,
Paddison
³

et al. 2017
Phys. Rev. B
36
12
42
1
View full text Add to dashboard Cite

Inelastic neutron scattering

Contact Info

Product

Resources

About

Numerical simulations and magnetism

Cited by 38 publications

References 18 publications

Semiclassical ground-state phase diagram andmulti-Qphase of a spin-orbit-coupled model on triangular lattice

Semiclassical ground-state phase diagram andmulti-Qphase of a spin-orbit-coupled model on triangular lattice

Spin order and dynamics in the diamond-lattice Heisenberg antiferromagnets CuRh2O4 and CoRh2O4Ge1, Flynn2, Paddison3 et al. 2017Phys. Rev. B3612421View full textAdd to dashboardCite

Inelastic neutron scattering

Contact Info

Product

Resources

About

Spin order and dynamics in the diamond-lattice Heisenberg antiferromagnets CuRh2O4 and CoRh2O4
Ge
¹
,
Flynn
²
,
Paddison
³

et al. 2017
Phys. Rev. B
36
12
42
1
View full text Add to dashboard Cite