Non-monotonic behavior of the spin gap in ZnCr2Se4 in magnetic field
The three-dimensional magnetic material ZnCr2Se4 has a cubic spinel (Fd¯3m) structure, in which magnetic Cr3+ ions (S = 3/2) are arranged in the pyrochlore sublattice consisting of geometrically frustrated corner-sharing tetrahedra. At low temperatures and low magnetic field, it displays a helical structure propagating along the (100) direction. With an increasing magnetic field, it gives way to a fully polarised regime through the yet unidentified phase at intermediate fields. Our recent experiment at LET revealed that the field dependence of the pseudo-Goldstone gap at the positions of magnetic Bragg peaks, suppressed by the domain selection, is not monotonic and the gap closes at 6 T, which corresponds to the recently proposed quantum critical point (QCP). The goal of the proposed experiment is to investigate the field dependence of the pseudo-Goldstone mode in the vicinity of the quantum criticality.
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Yuliia Tymoshenko; BOEHM Martin; Dmytro Inosov; KULBAKOV Anton; ONYKIIENKO Yevhen and SCHMALZL Karin. (2019). Non-monotonic behavior of the spin gap in ZnCr2Se4 in magnetic field. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-05-734
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