Higgs amplitude mode in Ca2RuO4
The phenomenon of Bose-Einstein condensation (BEC) takes many different guises in nature ranging from superfluidity in liquid helium and ultracold atomic gases to superconductivity in metals. An analogy is also found in magnetic insulators, in which a quantum phase transition takes place as magnons condensate. A well-known example is the BEC of triplons in a dimer system TlCuCl3 induced by tuning the boson density using magnetic field, providing a connection between complex quantum properties of matter and BEC. Recently, a novel type of BEC of spin-orbit excitons has been proposed in Ca2RuO4. Using TOF and polarized neutron scattering measurements, we have found strong indications for a magnetic mode compatible with the theoretical predictions. In order to complete our study, it is crucial to follow the dispersion of the additional mode, and by doing polarization analysis on a detwinned sample confirm its longitudinal nature. Additionally, following the broadening of the mode as the wavevector approaches $(\pi,\pi)$ will shed light on the decay process of the Higgs mode.
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PORRAS PEREZ GUERRERO Juan Pablo; J Bertinshaw; IVANOV Alexandre; JAIN Anil; KEIMER Bernhard; KIM Bumjoon and Maximilian J. Krautloher. (2016). Higgs amplitude mode in Ca2RuO4. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1497
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