Crystallization of spin superlattices with pressure and field in the layered magnet SrCu2(BO3)2

Haravifard, Sara; Graf, David; Feiguin, Adrian; Batista, Cristian D.; Lang, J. C.; Silevitch, D. M.; Srajer, G.; Gaulin, B. D.; Dąbkowska, H. A.; Rosenbaum, T. F.

doi:10.1038/ncomms11956

Cited by 55 publications

(53 citation statements)

References 42 publications

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“…3d,e we report the results obtained on a 100×90×20 μm 3 single crystal of SrCu(BO 3 ) 2 (SCBO), a widely investigated quantum magnet (see, e.g., Ref. [49,50]), which we measured in its paramagnetic state at 100 K. The spectrum consists of a single broad line (about 170 mT). As for the CuTPP sample, the sub-optimal field modulation amplitude determines an AC-ESR signal (about 30 kHz, see Fig.…”

Section: Electron Spin Resonance Experimentsmentioning

confidence: 90%

Single-chip electron spin resonance detectors operating at 50 GHz, 92 GHz, and 146 GHz

Matheoud

Gualco

Jeong

et al. 2017

Journal of Magnetic Resonance

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We report on the design and characterization of single-chip electron spin resonance (ESR) detectors operating at 50GHz, 92GHz, and 146GHz. The core of the single-chip ESR detectors is an integrated LC-oscillator, formed by a single turn aluminum planar coil, a metal-oxide-metal capacitor, and two metal-oxide semiconductor field effect transistors used as negative resistance network. On the same chip, a second, nominally identical, LC-oscillator together with a mixer and an output buffer are also integrated. Thanks to the slightly asymmetric capacitance of the mixer inputs, a signal at a few hundreds of MHz is obtained at the output of the mixer. The mixer is used for frequency down-conversion, with the aim to obtain an output signal at a frequency easily manageable off-chip. The coil diameters are 120μm, 70μm, and 45μm for the U-band, W-band, and the D-band oscillators, respectively. The experimental frequency noises at 100kHz offset from the carrier are 90Hz/Hz, 300Hz/Hz, and 700Hz/Hz at 300K, respectively. The ESR spectra are obtained by measuring the frequency variations of the single-chip oscillators as a function of the applied magnetic field. The experimental spin sensitivities, as measured with a sample of α,γ-bisdiphenylene-β-phenylallyl (BDPA)/benzene complex, are 1×10spins/Hz, 4×10spins/Hz, 2×10spins/Hz at 300K, respectively. We also show the possibility to perform experiments up to 360GHz by means of the higher harmonics in the microwave field produced by the integrated single-chip LC-oscillators.

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Section: Electron Spin Resonance Experimentsmentioning

confidence: 90%

Single-chip electron spin resonance detectors operating at 50 GHz, 92 GHz, and 146 GHz

Matheoud

Gualco

Jeong

et al. 2017

Journal of Magnetic Resonance

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“…Excellent magnetic susceptibility [8,12] and specific-heat [13] measurements made at this time were used to estimate the coupling ratio as J/J D 0.635, thereby placing SrCu 2 (BO 3 ) 2 rather close to the dimer-plaquette QPT. Detailed experiments performed in the intervening two decades have revealed a spectacular series of magnetization plateaus [8,[14][15][16][17][18][19][20][21], as well as a curious redistribution of spectral weight at temperatures very low on the scale of the triplon gap [11,22]. Of most interest to our current study is the result [23] that an applied pressure makes it possible to increase the ratio J/J D to the extent that, at approximately 1.9 GPa, the material is pushed through the QPT into a plaquette phase.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic properties of the Shastry-Sutherland model throughout the dimer-product phase

Wietek

Corboz

Weßel

et al. 2019

Phys. Rev. Research

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The thermodynamic properties of the Shastry-Sutherland model have posed one of the longestlasting conundrums in frustrated quantum magnetism. Over a wide range on both sides of the quantum phase transition (QPT) from the dimer-product to the plaquette-based ground state, neither analytical nor any available numerical methods have come close to reproducing the physics of the excited states and thermal response. We solve this problem in the dimer-product phase by introducing two qualitative advances in computational physics. One is the use of thermal pure quantum (TPQ) states to augment dramatically the size of clusters amenable to exact diagonalization. The second is the use of tensor-network methods, in the form of infinite projected entangled pair states (iPEPS), for the calculation of finite-temperature quantities. We demonstrate convergence as a function of system size in TPQ calculations and of bond dimension in our iPEPS results, with complete mutual agreement even extremely close to the QPT. Our methods reveal a remarkably sharp and low-lying feature in the magnetic specific heat around the QPT, whose origin appears to lie in a proliferation of excitations composed of two-triplon bound states. The surprisingly low energy scale and apparently extended spatial nature of these states explain the failure of less refined numerical approaches to capture their physics. Both of our methods will have broad and immediate application in addressing the thermodynamic response of a wide range of highly frustrated magnetic models and materials.

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“…Two paradigmatic two-dimensional (2D) spin-1/2 frustrated models with approximate experimental realizations are the kagome antiferromagnet and the Shastry-Sutherland model [7], the first as a candidate quantum spin liquid [8] and the second because of the remarkable, and still hotly debated, series of magnetization plateaus observed in SrCu 2 (BO 3 ) 2 [9][10][11][12][13][14][15][16][17]. Both models have triangles as their building blocks, and hence a severe QMC sign problem.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic properties of the Shastry-Sutherland model from quantum Monte Carlo simulations

et al. 2018

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We investigate the minus-sign problem that afflicts quantum Monte Carlo (QMC) simulations of frustrated quantum spin systems, focusing on spin S = 1/2, two spatial dimensions, and the extended Shastry-Sutherland model. We show that formulating the Hamiltonian in the diagonal dimer basis leads to a sign problem that becomes negligible at low temperatures for small and intermediate values of the ratio of the inter-and intra-dimer couplings. This is a consequence of the fact that the product state of dimer singlets is the exact ground state both of the extended Shastry-Sutherland model and of a corresponding "sign-problem-free" model, obtained by changing the signs of all positive off-diagonal matrix elements in the dimer basis. By exploiting this insight, we map the sign problem throughout the extended parameter space from the Shastry-Sutherland to the fully frustrated bilayer model and compare it with the phase diagram computed by tensor-network methods. We use QMC to compute with high accuracy the temperature dependence of the magnetic specific heat and susceptibility of the Shastry-Sutherland model for large systems up to a coupling ratio of 0.526(1) and down to zero temperature. For larger coupling ratios, our QMC results assist us in benchmarking the evolution of the thermodynamic properties by systematic comparison with exact diagonalization calculations and interpolated high-temperature series expansions. arXiv:1808.02043v2 [cond-mat.str-el] FIG. 1. Schematic representations of the extended Shastry-Sutherland model [Eq. (2)] in (a) single-plane and (b) bilayer format.

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Crystallization of spin superlattices with pressure and field in the layered magnet SrCu2(BO3)2

Cited by 55 publications

References 42 publications

Single-chip electron spin resonance detectors operating at 50 GHz, 92 GHz, and 146 GHz

Single-chip electron spin resonance detectors operating at 50 GHz, 92 GHz, and 146 GHz

Thermodynamic properties of the Shastry-Sutherland model throughout the dimer-product phase

Thermodynamic properties of the Shastry-Sutherland model from quantum Monte Carlo simulations

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