Longitudinal spin fluctuation 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 the unpolarized neutron scattering measurements, we have observed a dispersive magnon branch (up to 41 meV) with a gap of 12 meV along the [H00]-direction in Ca2RuO4. In addition, an almost non-dispersive magnon branch has also been observed at ~42 meV, which appears to be arising from the longitudinal magnetic fluctuations. Aim of the proposed experiment is to separate the spectra of transverse and longitudinal magnetic fluctuations by the polarized inelastic neutron scattering measurements.
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JAIN Anil; Dmytro Inosov; IVANOV Alexandre; KEIMER Bernhard; KIM Bumjoon; Maximilian J. Krautloher and PORRAS PEREZ GUERRERO Juan Pablo. (2015). Longitudinal spin fluctuation in Ca2RuO4. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1431
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