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note
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To date, most of the theoretical understanding of orbital orders centers on zero-point quantum (1/5) fluctuations. These were often deemed mandatory for generating orbital order. In an interesting work along these lines [15], it was explicitly shown how orbital order in the quantum 120°-model may be borne by a second-order 1/S expansion. Within this approximation, an excitation gap opens up, stabilizing order. In this letter, however, we firmly establish, without approximations, the existence of finite-temperature orbital order already within the classical (S → ∞) limit. Here orbital order is stabilized by thermal fluctuations.
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