Bethe string excitations at low magnetic fields in the Spin-1/2 antiferromagnetic XXZ chain SrCo2V2O8
A spin-1/2 anisotropic XXZ spin chain in a longitudinal field applied parallel to the easy access shows exotic physics. Above a critical field, the long-range antiferromagnetic order is destroyed and the system enters a gapless critical regime. As well as spinon-pair excitations (known as psinons), bound states of magnons can also be excited, these are known as Bethe strings and were first predicted by Hans Bethe in 1931 but have only been verified very recently by our terahertz and inelastic neutron scattering measurements on the model magnet SrCo2V2O8. Detailed comparison of our data to a newly developed Bethe Ansatz theory was able to provide quantitative proof of these excitations. The goal of this proposal is to perform a thorough investigation of the excitations using the Thales spectrometer in the low field critical region of SrCo2V2O8 where deviations from linear field dependence are anticipated and the theory breaks down. Therefore our experimental insights will provide important inputs for the theoretical understanding.
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Bella Lake; BERA Anup Kumar; BOEHM Martin; ISLAM A T M Nazmul and Puzniak. (2021). Bethe string excitations at low magnetic fields in the Spin-1/2 antiferromagnetic XXZ chain SrCo2V2O8. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-05-787
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