Sign switching of dimer correlations in 
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 under hydrostatic pressure

Bettler, Simon; Stoppel, Lena; Yan, Z.; Gvasaliya, S. N.; Zheludev, A.

doi:10.1103/physrevresearch.2.012010

Cited by 26 publications

(32 citation statements)

References 49 publications

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“…The quasi two-dimensional (2D) S = 1/2 quantum magnet SrCu 2 (BO 3 ) 2 [1-3] has emerged [4][5][6][7][8][9] as the most promising material for realizing the deconfined quantum-critical point (DQCP) [10][11][12], where a gapped state with a spontaneously formed singlet pattern meets a gapless antiferromagnetic (AF) state in a phase transition associated with fractionalized excitations (spinons). The intralayer interactions of the Cu spins correspond to the Shastry-Sutherland (SS) model [13], with highly frustrated AF interdimer (J) and intradimer (J') Heisenberg couplings.…”

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confidence: 99%

“…At ambient pressure SrCu 2 (BO 3 ) 2 is in the DS phase [1, 2] but it had been anticipated that the other SS phases may be reached under high pressure [16]. Recent heat capacity [7,8], neutron scattering [4], and Raman [9] experiments indeed detected phase transitions and excitations that confirm some variant [17] of the PS phase (from 1.7 to 2.5 GPa at temperatures below 2 K) and an AF phase (between 3 and 4 GPa below 4 K). A direct PS-AF transition may then be expected at low-temperature between 2.6 and 3 GPa [18].…”

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confidence: 99%

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Quantum Criticality and Spin Liquid Phase in the Shastry-Sutherland model

Yang,

Sandvik,

Wang

2021

Preprint

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Using the density-matrix renormalization group method for the ground state and excitations of the Shastry-Sutherland spin model, we demonstrate the existence of a narrow quantum spin liquid phase between the previously known plaquette-singlet and antiferromagnetic states. Our conclusions are based on finite-size scaling of excited level crossings and order parameters. Together with previous results on candidate models for deconfined quantum criticality and spin liquid phases, our results point to a unified quantum phase diagram where the deconfined quantum-critical point separates a line of first-order transitions and a gapless spin liquid phase. The frustrated Shastry-Sutherland model is close to the critical point but slightly inside the spin liquid phase, while previously studied unfrustrated models cross the first-order line. We also argue that recent heat capacity measurements in SrCu2(BO3)2 show evidence of the proposed spin liquid at pressures between 2.6 and 3 GPa.

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confidence: 99%

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confidence: 99%

Quantum Criticality and Spin Liquid Phase in the Shastry-Sutherland model

Yang,

Sandvik,

Wang

2021

Preprint

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“…24. In accordance with experimental studies 11,14,15 we consider pressures ranging from 0 to 4 GPa. Both the lattice parameters and the atomic positions were allowed to relax under fixed hydrostatic pressure until all the residual force components of each atom were less than 5 × 10 −4 eV/ Å.…”

Section: Computational Methods and Modelsmentioning

confidence: 89%

“…To explore this phase diagram experimentally, it has been proposed early on to use pressure to increase the ratio α, and indeed a phase transition around 2 GPa has been detected first by NMR 9,10 and then confirmed by inelastic neutron scattering (INS) 11 , magnetization measurements 12 , electron spin resonance (ESR) 13 , thermodynamic measurements 14 , and Raman scattering 15 . However, the properties of this phase do not seem to be consistent with the plaquette phase predicted by the numerical results obtained on the Shastry-Sutherland model.…”

Section: Introductionmentioning

confidence: 99%

SrCu$_2$(BO$_3$)$_2$ under pressure: a first-principle study

Badrtdinov,

Tsirlin,

Mazurenko

et al. 2020

Preprint

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Using density-functional theory (DFT) band-structure calculations, we study the crystal structure, the lattice dynamics, and the magnetic interactions in the Shastry-Sutherland magnet SrCu2(BO3)2 under pressure, concentrating on experimentally relevant pressures up to 4 GPa. We first check that a ferromagnetic spin alignment shortens the nearest-neighbor Cu-Cu distance and reduces the Cu-O-Cu angle compared to the state with the antiferromagnetic spin alignment in the dimers, in qualitative agreement with the structural changes observed at ambient pressure as a function of temperature and applied field. Next, we determine the optimal crystal structures corresponding to the magnetic structures respectively consistent with the dimer phase realized at ambient pressure, the Néel ordered phase realized at high pressures, and two candidates for the intermediate phase with two types of dimers and different stackings. For each phase, we performed a systematic study as a function of pressure, and we determined the exchange interactions and the frequencies of several experimentally relevant phonon modes. In the dimer phase, the ratio of the inter-to intra-dimer couplings is found to increase with pressure, in qualitative agreement with various experiments. This increase is mostly due to the decrease of the intra-dimer coupling due to the reduction of the Cu-O-Cu angle under pressure. The phonon frequency of the pantograph mode is also found to increase with pressure, in qualitative agreement with recent Raman experiments. In the Néel phase, the frequency of the pantograph mode is larger than the extrapolated value from the dimer phase, again in agreement with the experimental results, and accordingly the intradimer coupling is smaller than the extrapolated value from the dimer phase. Finally, all tendencies inside the candidate intermediate phases are thoroughly worked out, including specific predictions for some Raman active phonon modes that could be used to pin down the nature of the intermediate phase.

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“…4b, we plot the phonon energies of these three selected modes as a function of a magnetic field. The phonon at 25 meV (blue squares) corresponds to the so-called pantograph mode 36,37 . Its atomic displacement (sketched in the inset of Fig.…”

Section: B Field-and Temperature Dependence Of Phonon Modesmentioning

confidence: 99%

Thermally populated versus field-induced triplon bound states in the Shastry-Sutherland lattice SrCu$_2$(BO$_3$)$_2$

Wulferding,

Choi,

Lee

et al. 2021

Preprint

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The Shastry-Sutherland compound SrCu2(BO3)2 constituting orthogonally coupled dimers harbors a S = 0 singlet ground state. The confluence of strong interdimer interaction and frustration engenders a spectrum of low-energy excitations including localized triplons as well as singlet and triplet bound states. Their dynamics are controlled by an external magnetic field and temperature. Here, we employ high-field Raman spectroscopy to map the field and temperature evolution of such bosonic composite quasiparticles on approaching the 1/8 magnetization plateau. Our study unveils that the magnetic field and thermal fluctuations show remarkably similar effects in melting the singlet bound states, but are disparate in their effects on the fine spectral shapes. This, together with the anti-crossing of two singlet bound states in the intermediate field B = 10 − 16 T, is discussed in terms of the correlated dynamics of frustrated, interacting bosons.

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Sign switching of dimer correlations in SrCu2(BO3)2 under hydrostatic pressure

Cited by 26 publications

References 49 publications

Quantum Criticality and Spin Liquid Phase in the Shastry-Sutherland model

Quantum Criticality and Spin Liquid Phase in the Shastry-Sutherland model

SrCu$_2$(BO$_3$)$_2$ under pressure: a first-principle study

Thermally populated versus field-induced triplon bound states in the Shastry-Sutherland lattice SrCu$_2$(BO$_3$)$_2$

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