NMR evidence of pressure-induced structural transition and enhanced spin fluctuations up to 14~GPa in SrCu2(BO3)2
Abstract
The Shastry-Sutherland compound SrCu2(BO3)2 has attracted considerable interest as a platform for exploring quantum phases and quantum phase transitions driven by magnetic frustration. The pressure-induced structural and magnetic phase transitions in SrCu2(BO3)2, however, remain controversial. To address this issue, we performed high-pressure 11B nuclear magnetic resonance (NMR) measurements on SrCu2(BO3)2 up to 14~GPa. The NMR spectra reveal two pressure-induced monoclinic phases. With pressure above 4~GPa and with temperature below 10~K, the rapid broadening of the NMR spectrum and the power-law behavior in the spin-lattice relaxation rate 1/T1 provide clear evidence for a gapless 3D antiferromagnetic (AFM) phase in the monoclinic phase. At an intermediate temperature range around 20~K, the emergence of the field-dependent NMR line splits resolves a two-dimensional, short-range ordered AFM phase; at temperature above 30~K, the sublinear power-law behavior of 1/T1 identifies an extended correlated paramagnetic regime.
Versions
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BibTeX
@misc{wu2026evidence,
title = {{NMR evidence of pressure-induced structural transition and enhanced spin fluctuations up to 14~GPa in SrCu$_2$(BO$_3$)$_2$}},
author = {Zhanlong Wu and Kefan Du and Shuo Li and Tong Shi and Ying Chen and Qingxin Dong and Rui Zhou and Rong Yu and Juanjuan Liu and Bosen Wang and Jinguang Cheng and Weiqiang Yu and Yi Cui},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.06472},
eprint = {2609.06472},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.06472},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - NMR evidence of pressure-induced structural transition and enhanced spin fluctuations up to 14~GPa in SrCu_2(BO_3)_2
AU - Zhanlong Wu
AU - Kefan Du
AU - Shuo Li
AU - Tong Shi
AU - Ying Chen
AU - Qingxin Dong
AU - Rui Zhou
AU - Rong Yu
AU - Juanjuan Liu
AU - Bosen Wang
AU - Jinguang Cheng
AU - Weiqiang Yu
AU - Yi Cui
PY - 2026
DA - 2026/09/06
PB - arXiv
DO - 10.48550/arxiv.2609.06472
UR - https://arxiv.org/abs/2609.06472
AB - The Shastry-Sutherland compound SrCu_2(BO_3)_2 has attracted considerable interest as a platform for exploring quantum phases and quantum phase transitions driven by magnetic frustration. The pressure-induced structural and magnetic phase transitions in SrCu_2(BO_3)_2, however, remain controversial. To address this issue, we performed high-pressure ^11B nuclear magnetic resonance (NMR) measurements on SrCu_2(BO_3)_2 up to 14~GPa. The NMR spectra reveal two pressure-induced monoclinic phases. With pressure above 4~GPa and with temperature below 10~K, the rapid broadening of the NMR spectrum and the power-law behavior in the spin-lattice relaxation rate 1/T_1 provide clear evidence for a gapless 3D antiferromagnetic (AFM) phase in the monoclinic phase. At an intermediate temperature range around 20~K, the emergence of the field-dependent NMR line splits resolves a two-dimensional, short-range ordered AFM phase; at temperature above 30~K, the sublinear power-law behavior of 1/T_1 identifies an extended correlated paramagnetic regime.
ER -