Plaquette Singlet Transition, Magnetic Barocaloric Effect, and Spin Supersolidity in the Shastry-Sutherland Model

Abstract

Inspired by recent experimental measurements [Guo \textit{et al.}, Phys. Rev. Lett.~\textbf{124}, 206602 (2020); Jiménez \textit{et al.}, Nature \textbf{592}, 370 (2021)] on frustrated quantum magnet SrCu${}_2$(BO${}_3$)${}_2$ under combined pressure and magnetic fields, we study the related spin-$1/2$ Shastry-Sutherland (SS) model using state-of-the-art tensor network methods. By calculating thermodynamics, correlations and susceptibilities, we find, in zero magnetic field, not only a line of first-order plaquette-singlet (PS) to dimer-singlet phase transition ending with a critical point, but also signatures of the ordered PS transition with its critical endpoint terminating on this first-order line. Moreover, we uncover prominent magnetic barocaloric responses, a novel type of quantum correlation induced cooling effect, in the strongly fluctuating supercritical regime. Under finite fields, we identify a quantum phase transition from the PS phase to the spin supersolid phase that breaks simultaneously lattice translational and spin rotational symmetries. The present findings on the SS model are accessible in current experiments and would shed new light on exotic critical and supercritical phenomena in archetypal frustrated quantum magnets.

arXiv commentClose to the published version. 7 pages, 4 figures (SM 9 pages, 12 figures)

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Cited by in corpus (21)

• Thermodynamic crossovers in supercritical fluids
• Double Magnon-Roton Excitations in the Triangular-Lattice Spin Supersolid
• Quantum criticality with emergent symmetry in the extended Shastry-Sutherland model
• Wannier states and spin supersolid physics in the triangular antiferromagnet K${}_2$Co(SeO${}_3$)${}_2$
• Schwinger boson symmetric spin liquids of Shastry-Sutherland model
• Deconfined Quantum Critical Point: A Review of Progress
• Magneto- and barocaloric properties of the ferro-antiferromagnetic sawtooth chain
• Spin Seebeck Effect of Triangular-lattice Spin Supersolid
• Quantum spin liquid phase in the Shastry-Sutherland model revealed by high-precision infinite projected entangled-pair states
• Theory of rare-earth Kramers magnets on a Shastry-Sutherland lattice: dimer phases in presence of strong spin-orbit coupling
• Liquid-gas analog multicriticality in a frustrated Ising bilayer
• From the Shastry-Sutherland model to the $J_1$-$J_2$ Heisenberg model
• Theory of magnetism for rare-earth magnets on the Shastry-Sutherland lattice with non-Kramers ions
• Exact staggered dimer ground state and its stability in a two-dimensional magnet
• Emergent Spin Supersolids in Frustrated Quantum Materials
• Thermal Tensor Network Simulations of Lattice Fermions with Fixed Filling
• Ising Supercriticality and Universal Magnetocalorics in Spiral Antiferromagnet Nd${}_3$BWO${}_9$
• Supercritical-subcritical correspondence, asymmetric effects and antisymmetric corrections near a critical point
• Self-Ordered Supersolid in Spinor Condensates with Cavity-Mediated Spin-Momentum-Mixing Interactions
• Spiral Phase and Phase Diagram of the $S$=1/2 XXZ Model on the Shastry-Sutherland Lattice
• Quantum Supercritical Crossover with Dynamical Singularity