Luc Testa
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View article: Bullet pressure-cell design for neutron scattering experiments with horizontal magnetic fields and dilution temperatures
Bullet pressure-cell design for neutron scattering experiments with horizontal magnetic fields and dilution temperatures Open
The simultaneous application of high magnetic fields and high pressures for controlling magnetic ground states is important for testing our understanding of many-body quantum theory. However, the implementation for neutron scattering exper…
View article: Bullet pressure-cell design for neutron scattering experiments with horizontal magnetic fields and dilution temperatures
Bullet pressure-cell design for neutron scattering experiments with horizontal magnetic fields and dilution temperatures Open
The simultaneous application of high magnetic fields and high pressures for controlling magnetic ground states is important for testing our understanding of many-body quantum theory. However, the implementation for neutron scattering exper…
View article: Spin-orbital excitations encoding the magnetic phase transition in the van der Waals antiferromagnet FePS$_{3}$
Spin-orbital excitations encoding the magnetic phase transition in the van der Waals antiferromagnet FePS$_{3}$ Open
In the rich phases of van der Waals (vdW) materials featuring intertwined electronic order and collective phenomena, characterizing elementary dynamics that entail the low-energy Hamiltonian and electronic degrees of freedom is of paramoun…
View article: Spin dynamics in the square-lattice cupola system Ba(TiO)Cu$_4$(PO$_4$)$_4$
Spin dynamics in the square-lattice cupola system Ba(TiO)Cu$_4$(PO$_4$)$_4$ Open
We report high-resolution single-crystal inelastic neutron scattering measurements on the spin-1/2 antiferromagnet Ba(TiO)Cu$_4$(PO$_4$)$_4$. This material is formed from layers of four-site \cupola" structures, oriented alternately upward…
View article: Magnetic Field Induced Quantum Spin Liquid in the Two Coupled Trillium Lattices of K2 Ni2 (SO4)3
Magnetic Field Induced Quantum Spin Liquid in the Two Coupled Trillium Lattices of K2 Ni2 (SO4)3 Open
Quantum spin liquids are exotic states of matter that form when strongly frustrated magnetic interactions induce a highly entangled quantum paramagnet far below the energy scale of the magnetic interactions. Three-dimensional cases are esp…
View article: Static and dynamic properties of non-collinear quantum antiferromagnets explored by neutron scattering
Static and dynamic properties of non-collinear quantum antiferromagnets explored by neutron scattering Open
This thesis is devoted to the investigation of static and dynamic properties of two different sets of quantum magnets with neutron scattering techniques and the help of linear spin wave theory. Both systems are copper-based with spin-1/2, …
View article: Radial Spin Texture of the Weyl Fermions in Chiral Tellurium
Radial Spin Texture of the Weyl Fermions in Chiral Tellurium Open
Trigonal tellurium, a small-gap semiconductor with pronounced magneto-electric and magneto-optical responses, is among the simplest realizations of a chiral crystal. We have studied by spin- and angle-resolved photoelectron spectroscopy it…
View article: Design and performance of the multiplexing spectrometer CAMEA.
Design and performance of the multiplexing spectrometer CAMEA. Open
The cold neutron multiplexing secondary spectrometer CAMEA (Continuous Angle Multiple Energy Analysis) was commissioned at the Swiss spallation neutron source SINQ at the Paul Scherrer Institut at the end of 2018. The spectrometer is optim…
View article: Magnetic quadrupolar order in the chiral square cupola compound BaTiOCu<sub>4</sub>(PO<sub>4</sub>)<sub>4</sub>
Magnetic quadrupolar order in the chiral square cupola compound BaTiOCu<sub>4</sub>(PO<sub>4</sub>)<sub>4</sub> Open
We report neutron diffraction studies of the magnetic structure in BaTiOCu4(PO4)4 , which is a newly discovered magneticinsulator crystallizing in a tetragonal chiral crystal structure with P4212 space group [1]. The crystal structure isch…