Emergent bound states and impurity pairs in chemically doped Shastry-Sutherland system.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 31164637.
- Also identified by DOI 10.1038/s41467-019-10410-x and PMC identifier 6547672.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Impurities often play a defining role in the ground states of frustrated quantum magnets. Studies of their effects are crucial in understanding of the phase diagram in these materials. SrCu<sub>2</sub>(BO<sub>3</sub>)<sub>2</sub>, an experimental realization of the Shastry-Sutherland (SS) lattice, provides a unique model system for such studies using both experimental and numerical approaches. Here we report effects of impurities on the crystals of bound states, and doping-induced emergent ground states in Mg-doped SrCu<sub>2</sub>(BO<sub>3</sub>)<sub>2</sub>, which remain stable in high magnetic fields. Using four complementary magnetometry techniques and theoretical simulations, a rich impurity-induced phenomenology at high fields is discovered. The results demonstrate a rare example in which even a small doping concentration interacts strongly with both triplets and bound states of triplets, and thus plays a significant role in the magnetization process even at high magnetic fields. Our findings provide insights into the study of impurity effects in geometrically frustrated quantum magnets.