Field-induced bound-state condensation and spin-nematic phase in SrCu$_2$(BO$_3$)$_2$ revealed by neutron scattering up to 25.9 T
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2023
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866911754347347968 |
|---|---|
| author | Fogh, Ellen Nayak, Mithilesh Prokhnenko, Oleksandr Bartkowiak, Maciej Munakata, Koji Soh, Jian-Rui Turrini, Alexandra A. Zayed, Mohamed E. Pomjakushina, Ekaterina Kageyama, Hiroshi Nojiri, Hiroyuki Kakurai, Kazuhisa Normand, Bruce Mila, Frédéric Rønnow, Henrik M. |
| author_facet | Fogh, Ellen Nayak, Mithilesh Prokhnenko, Oleksandr Bartkowiak, Maciej Munakata, Koji Soh, Jian-Rui Turrini, Alexandra A. Zayed, Mohamed E. Pomjakushina, Ekaterina Kageyama, Hiroshi Nojiri, Hiroyuki Kakurai, Kazuhisa Normand, Bruce Mila, Frédéric Rønnow, Henrik M. |
| contents | Bose-Einstein condensation (BEC) underpins exotic forms of order ranging from superconductivity to superfluid 4 He. In quantum magnetic materials, ordered phases induced by an applied magnetic field can be described as the BEC of magnon excitations. With sufficiently strong magnetic frustration, exemplified by the system SrCu$_2$(BO$_3$)$_2$ , no clear magnon BEC is observed and the complex spectrum of multi-magnon bound states may allow a different type of condensation, but the high fields required to probe this physics have remained a barrier to detailed investigation. Here we exploit the first purpose-built high-field neutron scattering facility to measure the spin excitations of SrCu$_2$(BO$_3$)$_2$ up to 25.9 T and use cylinder matrix-product-states (MPS) calculations to reproduce the experimental spectra with high accuracy. Multiple unconventional features point to a condensation of $S = 2$ bound states into a spin-nematic phase, including the gradients of the one-magnon branches, the presence of many novel composite two- and three-triplon excitations and the persistence of a one-magnon spin gap. This gap reflects a direct analogy with superconductivity, suggesting that the spin-nematic phase in SrCu$_2$(BO$_3$)$_2$ is best understood as a condensate of bosonic Cooper pairs. Our results underline the wealth of unconventional states yet to be found in frustrated quantum magnetic materials under extreme conditions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2306_07389 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Field-induced bound-state condensation and spin-nematic phase in SrCu$_2$(BO$_3$)$_2$ revealed by neutron scattering up to 25.9 T Fogh, Ellen Nayak, Mithilesh Prokhnenko, Oleksandr Bartkowiak, Maciej Munakata, Koji Soh, Jian-Rui Turrini, Alexandra A. Zayed, Mohamed E. Pomjakushina, Ekaterina Kageyama, Hiroshi Nojiri, Hiroyuki Kakurai, Kazuhisa Normand, Bruce Mila, Frédéric Rønnow, Henrik M. Strongly Correlated Electrons Bose-Einstein condensation (BEC) underpins exotic forms of order ranging from superconductivity to superfluid 4 He. In quantum magnetic materials, ordered phases induced by an applied magnetic field can be described as the BEC of magnon excitations. With sufficiently strong magnetic frustration, exemplified by the system SrCu$_2$(BO$_3$)$_2$ , no clear magnon BEC is observed and the complex spectrum of multi-magnon bound states may allow a different type of condensation, but the high fields required to probe this physics have remained a barrier to detailed investigation. Here we exploit the first purpose-built high-field neutron scattering facility to measure the spin excitations of SrCu$_2$(BO$_3$)$_2$ up to 25.9 T and use cylinder matrix-product-states (MPS) calculations to reproduce the experimental spectra with high accuracy. Multiple unconventional features point to a condensation of $S = 2$ bound states into a spin-nematic phase, including the gradients of the one-magnon branches, the presence of many novel composite two- and three-triplon excitations and the persistence of a one-magnon spin gap. This gap reflects a direct analogy with superconductivity, suggesting that the spin-nematic phase in SrCu$_2$(BO$_3$)$_2$ is best understood as a condensate of bosonic Cooper pairs. Our results underline the wealth of unconventional states yet to be found in frustrated quantum magnetic materials under extreme conditions. |
| title | Field-induced bound-state condensation and spin-nematic phase in SrCu$_2$(BO$_3$)$_2$ revealed by neutron scattering up to 25.9 T |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2306.07389 |