Discovery of quantum phases in the Shastry-Sutherland compound SrCu2(BO3)2 under extreme conditions of field and pressure

Zhenzhong Shi, Sachith Dissanayake, Philippe Corboz, William Steinhardt, David Graf, D. M. Silevitch, Hanna A. Dabkowska, T. F. Rosenbaum, Frédéric Mila and Sara Haravifard ()
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Zhenzhong Shi: Duke University
Sachith Dissanayake: Duke University
Philippe Corboz: University of Amsterdam
William Steinhardt: Duke University
David Graf: Florida State University
D. M. Silevitch: California Institute of Technology
Hanna A. Dabkowska: McMaster University
T. F. Rosenbaum: California Institute of Technology
Frédéric Mila: Ecole Polytechnique Fédérale de Lausanne (EPFL)
Sara Haravifard: Duke University

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract The 2-dimensional layered oxide material SrCu2(BO3)2, long studied as a realization of the Shastry-Sutherland spin topology, exhibits a range of intriguing physics as a function of both hydrostatic pressure and magnetic field, with a still debated intermediate plaquette phase appearing at approximately 20 kbar and a possible deconfined critical point at higher pressure. Here, we employ a tunnel diode oscillator (TDO) technique to probe the behavior in the combined extreme conditions of high pressure, high magnetic field, and low temperature. We reveal an extensive phase space consisting of multiple magnetic analogs of the elusive supersolid phase and a magnetization plateau. In particular, a 10 × 2 supersolid and a 1/5 plateau, identified by infinite Projected Entangled Pair States (iPEPS) calculations, are found to rely on the presence of both magnetic and non-magnetic particles in the sea of dimer singlets. These states are best understood as descendants of the full-plaquette phase, the leading candidate for the intermediate phase of SrCu2(BO3)2.

Date: 2022
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DOI: 10.1038/s41467-022-30036-w

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