Magnetic excitation spectrum at the deconfined quantum critical point of the Shastry-Sutherland compound, SrCu2(BO3)2
We propose a 7 day inelastic neutron scattering experiment at IN8 to verify the predicted deconfined quantum critical point in the Shastry-Sutherland compound, SrCu2(BO3)2. If the experiment is succesful, this would be the first ever physical realization of such a critical point. The Shastry-Sutherland lattice consists of spin pairs (dimers) embedded in a square lattice with inter-dimer coupling, J, and intra-dimer coupling, J'. It has an exact dimer product ground state for J'/J <= 0.675. Upon increasing the ratio, J'/J, the system enter a plaquette singlet phase and finally the Néel state. SrCu2(BO3)2 is unique since it is topologically equivalent to the Shastry-Sutherland lattice and with the possibility to tune J'/J by applying pressure. Therefore, SCBO presents an amazing experimental playground for theoretical predictions. One such prediction is the existence of a so-called deconfined quantum critical point at the phase transition between the plaquette phase and Néel state at 4.0GPa. This critical point has a distinct footprint in the magnetic excitation spectrum and it is exactly what we aim to investigate with the proposed experiment.
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FOGH Ellen; AMAND Louis; BOEHM Martin; GIRIAT Gaetan; HANSEN Ursula Bengaard; IVANOV Alexandre; KLOTZ Stefan; PIOVANO Andrea; Henrik M. Ronnow; SAFIULINA Irina; JIAN-RUI SOH and ZAYED Mohamed. (2021). Magnetic excitation spectrum at the deconfined quantum critical point of the Shastry-Sutherland compound, SrCu2(BO3)2. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1655
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