Sign-switching of dimer correlations in SrCu${}_2$(BO${}_3$)${}_2$ under hydrostatic pressure

Abstract

Magnetic and vibrational excitations in SrCu${}_2$(BO${}_3$)${}_2$ are studied using Raman spectroscopy at hydrostatic pressures up to 34 kbar and temperatures down to 2.6 K. The frequency of a particular optical phonon, the so-called pantograph mode, shows a very strong anomalous temperature dependence below about 40 K. We link the magnitude of the effect to the magnetic exchange energy on the dimer bonds in the Sutherland-Shastry spin lattice in this material. The corresponding dimer spin correlations are quantitatively estimated and found to be strongly pressure dependent. At around P${}_2\sim$22 kbar they switch from antiferromagnetic to being predominantly ferromagnetic.

References in corpus (31)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Optimized norm-conserving Vanderbilt pseudopotentials
• Pseudopotentials for high-throughput DFT calculations
• Optimization Algorithm for the Generation of ONCV Pseudopotentials
• Precision and efficiency in solid-state pseudopotential calculations
• Exact dimer ground state of the two dimensional Heisenberg spin system SrCu_2(BO_3)_2
• Quantum Phase Transitions in the Shastry-Sutherland Model for $\mathbf{SrC}{\mathbf{u}}_2(\mathbf{B}{\mathbf{O}}_3{)}_2$
• Tensor network study of the Shastry-Sutherland model in zero magnetic field
• Observation of a 4-spin Plaquette Singlet State in the Shastry-Sutherland compound SrCu2(BO3)2
• Exact Demonstration of Magnetization Pleateaus and First Order Dimer-Néel Phase Transitions in a Modified Shastry-Sutherland Model for SrCu${}_2$(BO${}_3$)${}_2$
• Phase Diagram of the quadrumerized Shastry-Sutherland Model
• Various series expansions for a Heisenberg antiferromagnet model for SrCu${}_2$(BO${}_3$)${}_2$
• Quantum Phases of the Shastry-Sutherland Antiferromagnet
• Collective Singlet Excitations and Evolution of Raman Spectral Weights in the 2D Spin Dimer Compound SrCu2(BO3)2
• First order transition between magnetic order and valence-bond order in a 2D frustrated Heisenberg model
• Coupled Cluster Treatment of the Shastry-Sutherland Antiferromagnet
• Competition between intermediate plaquette phases in SrCu${}_2$(BO${}_3$)${}_2$ under pressure
• Direct Observation of the Quantum Phase Transition of SrCu${}_2$(BO${}_3$)${}_2$ by High-Pressure and Terahertz Electron Spin Resonance
• A Novel Ordered Phase in SrCu2(BO3)2 under High Pressure
• Dynamic Structure Factor of the Two-Dimensional Shastry-Sutherland Model
• Dynamics and Instabilities of the Shastry-Sutherland Model
• Competing Spin-Gap Phases in a Frustrated Quantum Spin System in Two Dimensions
• Variational treatment of the Shastry-Sutherland antiferromagnet using Projected Entangled Pair States (PEPS)
• Continuous and Discontinuous Quantum Phase Transitions in a Model Two-Dimensional Magnet
• Field theory for generalized Shastry-Sutherland models
• Spin-Phonon Chains with Bond Coupling
• Symmetry and light coupling to phononic and collective magnetic excitations in SrCu_2(BO_3)_2
• Phase transitions in the Shastry-Sutherland lattice
• Emergence of One-Dimensional Physics from the Distorted Shastry-Sutherland Lattice
• Identifying topological order in the Shastry-Sutherland model via entanglement entropy
• High pressure Raman study of the quantum magnet (C${}_4$H${}_{12}$N${}_2$)Cu${}_2$Cl${}_6$

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