Investigating field-induced magnetic order in Han purple by neutron scattering up to 25.9 T

Allenspach, Stephan; Madsen, A.; Biffin, Alun; Bartkowiak, Maciej; Prokhnenko, O.; Gazizulina, Alsu; X., Liu,; Wahle, R.; Gerischer, S.; Kempfer, Stephan; P., Heller,; Smeibidl, P.; Mira, Antonietta; Laflorencie, Nicolas; Mila, Frédéric; Normand, B.; Rüegg, Christian

doi:10.1103/physrevb.106.104418

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“…Early and spectacular examples of this Bose-Einstein condensation (BEC) include superfluidity in liquid 4 He and superconductivity in metals, where attractive interactions allow the electrons, which are fermions, to form Cooper pairs, which are bosons. Field-induced gap closure and magnetic order in quantum disordered magnetic materials is conventionally described as a BEC of magnons, which are spin-1 excitations 2 , 3 ; examples of this phenomenon include the dimerized quantum antiferromagnets TlCuCl 3 4 , 5 and BaCuSi 2 O 6 6 – 8 , and, under quite different experimental conditions, yttrium iron garnet 9 , 10 .…”

Section: Introductionmentioning

confidence: 99%

“…Model calculations for frustrated 2D quantum systems have also been a historical impossibility, but recent progress in numerical methods based on matrix-product states (MPS) has made it possible to calculate hitherto unavailable spectral functions with quantitative accuracy. These parallel developments render high-field INS the ideal tool to decode the spin dynamics in SrCu 2 (BO 3 ) 2 and in a range of other systems 8 .…”

Section: Introductionmentioning

confidence: 99%

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Field-induced bound-state condensation and spin-nematic phase in SrCu2(BO3)2 revealed by neutron scattering up to 25.9 T

Fogh,

Nayak,

Prokhnenko

et al. 2024

Nat Commun

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In quantum magnetic materials, ordered phases induced by an applied magnetic field can be described as the Bose-Einstein condensation (BEC) of magnon excitations. In the strongly frustrated system SrCu2(BO3)2, no clear magnon BEC could be observed, pointing to an alternative mechanism, but the high fields required to probe this physics have remained a barrier to detailed investigation. Here we exploit the first purpose-built high-field neutron scattering facility to measure the spin excitations of SrCu2(BO3)2 up to 25.9 T and use cylinder matrix-product-states (MPS) calculations to reproduce the experimental spectra with high accuracy. Multiple unconventional features point to a condensation of S = 2 bound states into a spin-nematic phase, including the gradients of the one-magnon branches and the persistence of a one-magnon spin gap. This gap reflects a direct analogy with superconductivity, suggesting that the spin-nematic phase in SrCu2(BO3)2 is best understood as a condensate of bosonic Cooper pairs.

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