Publications (7)
Weak coupling of pseudoacoustic phonons and magnon dynamics in incommensurate spin ladder compound Sr14Cu24O41
Xi Chen, Dipanshu Bansal, Sean Sullivan +5
Intriguing lattice dynamics has been predicted for aperiodic crystals that contain incommensurate substructures. Here we report inelastic neutron scattering measurements of phonon…
Thermal expansion coefficient and lattice anharmonicity of cubic boron arsenide
Xi Chen, Chunhua Li, Fei Tian +6
Recent measurements of an unusual high thermal conductivity of around 1000 W m-1 K-1 at room temperature in cubic boron arsenide (BAs) confirm predictions from theory and suggest p…
Direct observation of magnon-phonon coupling in yttrium iron garnet
Haoran Man, Zhong Shi, Guangyong Xu +7
The magnetic insulator yttrium iron garnet (YIG) with a ferrimagnetic transition temperature of 560 K has been widely used in microwave and spintronic devices. Anomalous feat…
Optical generation and detection of local non-equilibrium phonons in suspended graphene
Sean Sullivan, Ajit Vallabhaneni, Iskandar Kholmanov +3
The measured frequencies and intensities of different first- and second- order Raman peaks of suspended graphene are used to show that optical phonons and different acoustic phonon…
Effects of Grain Boundaries and Defects on Anisotropic Magnon Transport in Textured Sr14Cu24O41
Xi Chen, Karalee Jarvis, Sean Sullivan +3
The strong spin-spin exchange interaction in some low-dimensional magnetic materials can give rise to a high group velocity and thermal conductivity contribution from magnons. One…
Magnons and Phonons Optically Driven Out of Local Equilibrium in a Magnetic Insulator
Kyongmo An, Kevin S. Olsson, Annie Weathers +9
Magnons are the energy quanta of fundamental spin excitations, namely spin waves, and they can make a considerable contribution to energy transport in some magnetic materials in a…
Computational search for materials having a giant anomalous Hall effect in the pyrochlore and spinel crystal structures
Sean Sullivan, Seungjun Lee, Nathan J. Szymanski +4
Ferromagnetic pyrochlore and spinel materials with topological flat bands are of interest for their potential to exhibit a giant anomalous Hall effect (AHE). In this work, we prese…