Spin dynamics and unconventional Coulomb phase in Nd$_2$Zr$_2$O$_7$
| Autor: | Léger, M., Lhotel, E., Hatnean, M. Ciomaga, Ollivier, J., Wildes, A. R., Raymond, S., Ressouche, E., Balakrishnan, G., Petit, S. |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 126, 247201 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.126.247201 |
| Popis: | We investigate the temperature dependence of the spin dynamics in the pyrochlore magnet Nd$_2$Zr$_2$O$_7$ by neutron scattering experiments. At low temperature, this material undergoes a transition towards an "all in - all out" antiferromagnetic phase and the spin dynamics encompass a dispersion-less mode, characterized by a dynamical spin ice structure factor. Unexpectedly, this mode is found to survive above $T_{\rm N} \approx 300$ mK. Concomitantly, elastic correlations of the spin ice type develop. These are the signatures of a peculiar correlated paramagnetic phase which can be considered as a new example of Coulomb phase. Our observations near $T_{\rm N}$ do not reproduce the signatures expected for a Higgs transition, but show reminiscent features of the "all in - all out" order superimposed on a Coulomb phase. Comment: 6 pages + 9 pages supp. mat |
| Databáze: | arXiv |
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