Quantum spherical XY model with orthorhombic anisotropy in two dimensions
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The quantum spherical XY model with orthorhombic anisotropy is investigated. It is shown that in contradiction with the results of reference [#!9!#], the long-range magnetic order is stabilized in two dimensions. Both analytical and numerical results are presented. The incorrect results of the work  are explained to be the result of improper choice of quantization axis.
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