| Zugriffsnummer | 47342 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | mit Peer Review |
| Sprache | Englisch |
| Titel | Anomalous magnetic noise in an imperfectly flat landscape in the topological magnet Dy2Ti2O7 |
| Autor(in); Institution |
Samarakoon, Anjana M.; Neutron Scattering Division, Oak Ridge National Laboratory (ORNL), Tennessee, USA
Grigera, Santiago A.; Instituto de Física de Líquidos y Sistemas Biológicos, Universidad Nacional de La Plata - Consejo Nacional de Investigaciones Científicas y Técnicas, La Plata, ARGENTINA
Tennant, D. Alan; Helmholtz-Zentrum Berlin, Institut komplexe magnetische Materialien, Berlin, GERMANY
Klemke, Bastian; Helmholtz-Zentrum Berlin, Institut komplexe magnetische Materialien, Berlin, GERMANY
Strehlow, Peter; PTB-Berlin, retired staff
Meissner, Michael; Helmholtz-Zentrum Berlin, Institut komplexe magnetische Materialien, Berlin, GERMANY
Hallén, Jonathan N.; Theory of Condensed Matter Group, Cavendish Laboratory, University of Cambridge, UNITED KINGDOM; Max Planck Institute for the Physics of Complex Systems, Dresden, GERMANY
Jaubert, Ludovic; CNRS, Laboratoire Ondes et Matière d’Aquitaine, Université de Bordeaux, Talence, FRANCE
Castelnovo, Claudio; Theory of Condensed Matter Group, Cavendish Laboratory, University of Cambridge, UNITED KINGDOM
Moessner, Roderich; Max Planck Institute for the Physics of Complex Systems, Dresden, GERMANY
|
| Quelle/Jahr | Proceedings of the National Academy of Sciences of the United States of America: 119 (2022), 5, 6 S. |
| Artikelnummer | e2117453119 |
| ISSN | 0027-8424 (PRINT) ; 1091-6490 (ONLINE) |
| DOI | |
| Verlag | Washington DC: NAS |
| Zusammenfassung | Noise generated by motion of charge and spin provides a unique window into materials at the atomic scale. From temperature of resistors to electrons breaking into fractional quasiparticles, “listening” to the noise spectrum is a powerful way to decode underlying dynamics. Here, we use ultrasensitive superconducting quantum interference device (SQUIDs) to probe the puzzling noise in a frustrated magnet, the spin-ice compound Dy2Ti2O7 (DTO), revealing cooperative and memory effects. DTO is a topological magnet in three dimensions - characterized by emergent magnetostatics and telltale fractionalized magnetic monopole quasiparticles - whose real-time dynamical properties have been an enigma from the very beginning. We show that DTO exhibits highly anomalous noise spectra, differing significantly from the expected Brownian noise of monopole random walks, in three qualitatively different regimes: equilibrium spin ice, a “frozen” regime extending to ultralow temperatures, and a high-temperature “anomalous” paramagnet. We present several distinct mechanisms that give rise to varied colored noise spectra. In addition, we identify the structure of the local spin-flip dynamics as a crucial ingredient for any modeling. Thus, the dynamics of spin ice reflects the interplay of local dynamics with emergent topological degrees of freedom and a frustration-generated imperfectly flat energy landscape, and as such, it points to intriguing cooperative and memory effects for a broad class of magnetic materials. |
| Kostenfreier Zugang | Open Access Hybrid |
| Rechteinformation | CC BY-NC-ND 4.0 ; Creative Commons Attribution NonCommercial NoDerivatives 4.0 License |
Zitierung
Samarakoon, A. M., Grigera, S. A., Tennant, D. A., Kirste, A., Klemke, B., Strehlow, P., Meissner, M., Hallén, J. N., Jaubert, L., Castelnovo, C., & Moessner, R. (2022). Anomalous magnetic noise in an imperfectly flat landscape in the topological magnet Dy₂Ti₂O₇. Proceedings of the National Academy of Sciences of the United States of America, 119(5), 6 S. https://doi.org/10.1073/pnas.2117453119