Abstract
Abstract We present an x-ray study of the q 2 -pretransitional structural fluctuations of the low temperature T 2 =59 K Peierls transition of the trichalcogenure NbSe 3 . These fluctuations are less anisotropic than the q 1 -ones of the high temperature Peierls transition. We present evidence that close to T 2 the q 2 -fluctuations exhibit two length scales. The longer one appears 3 K above T 2 and diverges at T 2 while the shorter one is not critical. These features recall those observed in magnetic systems and perovskites.
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