TY  - JOUR
AU  - Fogh, Ellen
AU  - Nayak, Mithilesh
AU  - Prokhnenko, Oleksandr
AU  - Bartkowiak, Maciej
AU  - Munakata, Koji
AU  - Soh, Jian-Rui
AU  - Turrini, Alexandra A.
AU  - Zayed, Mohamed E.
AU  - Pomjakushina, Ekaterina
AU  - Kageyama, Hiroshi
AU  - Nojiri, Hiroyuki
AU  - Kakurai, Kazuhisa
AU  - Normand, Bruce
AU  - Mila, Frédéric
AU  - Rønnow, Henrik M.
TI  - Field-induced bound-state condensation and spin-nematic phase in SrCu2(BO3)2 revealed by neutron scattering up to 25.9 T
JO  - Nature Communications
VL  - 15
IS  - 1
SN  - 2041-1723
CY  - [London]
PB  - Nature Publishing Group UK
M1  - FZJ-2024-06538
SP  - 442
PY  - 2024
AB  - In quantum magnetic materials, ordered phases induced by an applied magnetic field can be described as the Bose-Einstein condensation (BEC) of magnon excitations. In the strongly frustrated system SrCu2(BO3)2, no clear magnon BEC could be observed, pointing to an alternative mechanism, 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 SrCu2(BO3)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 and the persistence of a one-magnon spin gap. This gap reflects a direct analogy with superconductivity, suggesting that the spin-nematic phase in SrCu2(BO3)2 is best understood as a condensate of bosonic Cooper pairs.
LB  - PUB:(DE-HGF)16
C6  - 38200029
UR  - <Go to ISI:>//WOS:001141040600024
DO  - DOI:10.1038/s41467-023-44115-z
UR  - https://juser.fz-juelich.de/record/1033676
ER  -