Proximate deconfined quantum critical point in SrCu2(BO3)2

Abstract

The deconfined quantum critical point (DQCP) represents a paradigm shift in quantum matter studies, presenting a "beyond Landau" scenario for order--order transitions. Its experimental realization, however, has remained elusive. Using high-pressure ${}^{11}$B NMR measurements on the quantum magnet SrCu${}_2$(BO${}_3$)${}_2$, we here demonstrate a magnetic-field induced plaquette-singlet to antiferromagnetic transition above 1.8 GPa at a remarkably low temperature, $T_{\mathrm{c}}\simeq 0.07$ K. First-order signatures of the transition weaken with increasing pressure, and we observe quantum critical scaling at the highest pressure, 2.4 GPa. Supported by model calculations, we suggest that these observations can be explained by a proximate DQCP inducing critical quantum fluctuations and emergent O(3) symmetry of the order parameters. Our findings take the DQCP from a theoretical concept to a concrete experimental platform.

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Cited by in corpus (42)

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• Absence of spin liquid phase in the $J_1-J_2$ Heisenberg model on the square lattice
• Disorder Operator and Rényi Entanglement Entropy of Symmetric Mass Generation
• Diagnosing $SO(5)$ Symmetry and First-Order Transition in the $J-Q_3$ Model via Entanglement Entropy
• Extracting subleading corrections in entanglement entropy at quantum phase transitions
• Evolution of entanglement entropy at SU($N$) deconfined quantum critical points
• Entanglement entropy and deconfined criticality: emergent SO(5) symmetry and proper lattice bipartition
• Frustrated extended Bose-Hubbard model and deconfined quantum critical points with optical lattices at the anti-magic wavelength
• Quantum criticality with emergent symmetry in the extended Shastry-Sutherland model
• Emergent self-duality in long range critical spin chain: from deconfined criticality to first order transition
• Schwinger boson symmetric spin liquids of Shastry-Sutherland model
• Three-dimensional Abelian and non-Abelian gauge Higgs theories
• Investigating Berezinskii-Kosterlitz-Thouless phase transitions in Kagome spin ice by quantifying Monte Carlo process: Distribution of Hamming distances
• Deconfined Quantum Critical Point: A Review of Progress
• Critical properties of metallic and deconfined quantum phase transitions in Dirac systems
• Deconfined quantum critical point lost in pressurized SrCu2(BO3)2
• Spin waves and three-dimensionality in the high-pressure antiferromagnetic phase of SrCu${}_2$(BO${}_3$)${}_2$
• Emergent criticality in fully frustrated quantum magnets
• Deconfined quantum phase transition on the kagome lattice: Distinct velocities of spinon and string excitations
• Tensor network study of the Shastry-Sutherland model with weak interlayer coupling
• The Nordic-walking mechanism and its explanation of deconfined pseudocriticality from Wess-Zumino-Witten theory
• Topological physics in quantum critical systems
• Theory of rare-earth Kramers magnets on a Shastry-Sutherland lattice: dimer phases in presence of strong spin-orbit coupling
• Quantum spin liquid phase in the Shastry-Sutherland model revealed by high-precision infinite projected entangled-pair states
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• Deconfined criticality as intrinsically gapless topological state in one dimension
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• Deconfined quantum criticality of frustrated hard-core dipolar bosons
• Triplons, triplon pairs and dynamical symmetries in laser-driven Shastry-Sutherland magnets
• Frustrated Rydberg Atom Arrays Meet Cavity-QED: Emergence of the Superradiant Clock Phase
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• Single-layer framework of variational tensor network states
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• Emergent $D_8^{(1)}$ spectrum and topological soliton excitation in CoNb${}_2$O${}_6$