Multiple Magnetic Bilayers and Unconventional Criticality without Frustration in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Ba</mml:mi><mml:mtext>C</mml:mtext><mml:mtext>u</mml:mtext><mml:mtext>S</mml:mtext><mml:mtext>i</mml:mtext></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Allenspach, Stephan; Biffin, Alun; Stuhr, U.; Tucker, G. S.; Ohira‐Kawamura, Seiko; Kofu, Maiko; Voneshen, David; Boehm, Martin; Normand, B.; Laflorencie, Nicolas; Mila, Frédéric; Rüegg, Christian

doi:10.1103/physrevlett.124.177205

Cited by 14 publications

(53 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1e-f, one may state at the qualitative level that the location of the band minimum in Q h is a consequence of an effectively ferromagnetic (FM) intra-bilayer interaction parameter (J in Fig. 1b), as proposed 53 and observed 54 in BaCuSi 2 O 6 . Similarly, the location of the band minimum in Q l is a consequence of a FM interbilayer interaction parameter, J , which is the magnetic coupling between the top ions of dimers in one bilayer and the bottom ions of the dimers in the next (Fig.…”

Section: Resultsmentioning

confidence: 77%

“…Turning to a quantitative analysis of the lowtemperature spectrum, Fig. 2a shows the scattered intensity as a function of energy for Ba 0.9 Sr 0.1 CuSi 2 O 6 (blue symbols), and also the comparison with BaCuSi 2 O 6 (red), 54 which we discuss below; both data sets were measured on TASP at Q = (0 0 4) using similar experimental conditions. The solid lines are Gaussian fits used to extract the location, linewidth and intensity of the triplon modes.…”

Section: Resultsmentioning

confidence: 99%

“…We stress that our observation of one triplon mode per minimal magnetic unit cell means that the Ba 0.9 Sr 0.1 CuSi 2 O 6 structure contains only one type of bilayer, in contrast to the complicated situation in BaCuSi 2 O 6 . 54 An accurate determination of the spin Hamiltonian is crucial to verify the quasi-2D characteristics of the material and for a detailed investigation of the resulting critical behaviour in an applied magnetic field. We assume that the minimal magnetic Hamiltonian of Ba 0.9 Sr 0.1 CuSi 2 O 6 is that displayed in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…We note that J is an effective inter-dimer interaction parameter that combines two pairs of ionic (Cu 2+ -Cu 2+ ) interactions within and between the two layers of the bilayer structure. 53,54 By fitting the dispersion of the triplon mode shown in Figs. 2b,c (Methods), we deduce the optimal parameter set J = 4.28(2) meV, J = −0.52(1) meV and J = −0.02(1) meV, where negative values denote FM interactions.…”

Section: Resultsmentioning

confidence: 99%

“…However, it was shown subsequently that the weakly orthorhombic structure of this material below 90 K [46][47][48] contains three types of structurally 49 and magnetically [50][51][52] inequivalent bilayers, and later that the inter-bilayer coupling is in fact unfrustrated. 53,54 These properties lead ultimately to a regime of anomalous effective scaling in the experimentally accessible parameter space, 54 with the 3D critical behaviour remaining unobservable.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Revealing three-dimensional quantum criticality by Sr substitution in Han purple

Allenspach

Puphal

Link

et al. 2021

Phys. Rev. Research

Self Cite

View full text Add to dashboard Cite

Classical and quantum phase transitions (QPTs), with their accompanying concepts of criticality and universality, are a cornerstone of statistical thermodynamics. An exemplary controlled QPT is the field-induced magnetic ordering of a gapped quantum magnet. Although numerous "quasi-one-dimensional" coupled spin-chain and -ladder materials are known whose ordering transition is three-dimensional (3D), quasi-2D systems are special for several physical reasons. Motivated by the ancient pigment Han Purple (BaCuSi2O6), a quasi-2D material displaying anomalous critical properties, we present a complete analysis of Ba0.9Sr0.1CuSi2O6. We measure the zero-field magnetic excitations by neutron spectroscopy and deduce the magnetic Hamiltonian. We probe the field-induced transition by combining magnetization, specific-heat, torque and magnetocalorimetric measurements with low-temperature nuclear magnetic resonance studies near the QPT. By a Bayesian statistical analysis and large-scale Quantum Monte Carlo simulations, we demonstrate unambiguously that observable 3D quantum critical scaling is restored by the structural simplification arising from light Srsubstitution in Han Purple.

show abstract

Section: Resultsmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Revealing three-dimensional quantum criticality by Sr substitution in Han purple

Allenspach

Puphal

Link

et al. 2021

Phys. Rev. Research

Self Cite

View full text Add to dashboard Cite

show abstract

Egyptian blue, Chinese blue, and related two-dimensional silicates: from antiquity to future technologies. Part A: general properties and historical uses

Nicola

Gobetto

Mašić

2023

Rend. Fis. Acc. Lincei

View full text Add to dashboard Cite

The ancient Egyptian blue pigment was developed over 5000 years ago and was used extensively for around four millennia until its use mysteriously declined dramatically during the Early Middle Ages. It recently attracted a lot of attention along with some related materials, leading to a fast-growing number of applications in fields, such as sensors, solar concentrators, energy-saving, and medicine. The new surge in interest began in 1996 with the discovery of their intense NIR photoluminescence that surprisingly can be triggered even by visible light. In 2013, the possibility of exfoliating them and producing NIR luminescent nanosheets was established, expanding the family of 2D nanomaterials. More recently, the discovery of their high antibacterial effects and biocompatibility, and very promising optical, electric and magnetic properties, has further boosted their applications. The characteristics of Egyptian blue are due to its main component: the very stable crystalline compound CaCuSi4O10. This tetragonal sheet silicate is the synthetic analogous of the rare cuprorivaite mineral. In Part A of this review, we summarize the historical uses and main properties (i.e., composition, structure, color, stability, luminescence, and biological activity) of cuprorivaite and related 2D silicates, i.e., BaCuSi4O10 (the main constituent of the ancient pigment Chinese Blue), BaCuSi2O6 (the main constituent of the ancient pigment Chinese Purple), SrCuSi4O10 (synthetic analogous of wesselsite) and BaFeSi4O10 (synthetic analogous of gillespite). The Part B of the review will focus on the modern rediscovery of these materials, their modern synthesis and exfoliation, and the innovative applications based on their properties.

show abstract

Experimental signatures of quantum and topological states in frustrated magnetism

Khatua,

Sana,

Zorko

et al. 2023

Physics Reports

View full text Add to dashboard Cite

Multiple Magnetic Bilayers and Unconventional Criticality without Frustration in BaCuSi2O6

Cited by 14 publications

References 53 publications

Revealing three-dimensional quantum criticality by Sr substitution in Han purple

Revealing three-dimensional quantum criticality by Sr substitution in Han purple

Egyptian blue, Chinese blue, and related two-dimensional silicates: from antiquity to future technologies. Part A: general properties and historical uses

Experimental signatures of quantum and topological states in frustrated magnetism

Contact Info

Product

Resources

About