Hierarchical excitations from correlated spin tetrahedra on the breathing pyrochlore lattice
| Autor: | Gao, Shang, May, Andrew F., Du, Mao-Hua, Paddison, Joseph A. M., Arachchige, Hasitha Suriya, Pokharel, Ganesh, Cruz, Clarina dela, Zhang, Qiang, Ehlers, Georg, Parker, David S., Mandrus, David G., Stone, Matthew B., Christianson, Andrew D. |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 103, 214418 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.103.214418 |
| Popis: | The hierarchy of the coupling strengths in a physical system often engenders an effective model at low energies where the decoupled high-energy modes are integrated out. Here, using neutron scattering, we show that the spin excitations in the breathing pyrochlore lattice compound CuInCr$_4$S$_8$ are hierarchical and can be approximated by an effective model of correlated tetrahedra at low energies. At higher energies, intra-tetrahedron excitations together with strong magnon-phonon couplings are observed, which suggests the possible role of the lattice degree of freedom in stabilizing the spin tetrahedra. Our work illustrates the spin dynamics in CuInCr$_4$S$_8$ and demonstrates a general effective-cluster approach to understand the dynamics on the breathing-type lattices. Comment: 11 pages, 9 figures |
| Databáze: | arXiv |
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