Emergent bound states and impurity pairs in chemically doped Shastry-Sutherland system

Zhenzhong Shi, William Steinhardt, David Graf, Philippe Corboz, Franziska Weickert, Neil Harrison, Marcelo Jaime, Casey Marjerrison, Hanna A. Dabkowska, Frédéric Mila and Sara Haravifard ()
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Zhenzhong Shi: Duke University
William Steinhardt: Duke University
David Graf: Florida State University
Philippe Corboz: University of Amsterdam
Franziska Weickert: Florida State University
Neil Harrison: National High Magnetic Field Laboratory, Los Alamos National Laboratory
Marcelo Jaime: National High Magnetic Field Laboratory, Los Alamos National Laboratory
Casey Marjerrison: Duke University
Hanna A. Dabkowska: McMaster University, Hamilton
Frédéric Mila: Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL)
Sara Haravifard: Duke University

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: 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. SrCu2(BO3)2, 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 SrCu2(BO3)2, 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.

Date: 2019
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DOI: 10.1038/s41467-019-10410-x

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