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14 December 2024

» arxiv » cond-mat/9710183

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Interference of a first-order transition with the formation of a spin-Peierls state in alpha'-NaV2O5?
M.Koeppen ; D.Pankert ; R.Hauptmann ; M.Lang ; M.Weiden ; C.Geibel ; F.Steglich ;
Date:	17 Oct 1997
Subject:	cond-mat
Abstract:	We present results of high-resolution thermal-expansion and specific-heat measurements on single crystalline alpha’-NaV2O5. We find clear evidence for two almost degenerate phase transitions associated with the formation of the dimerized state around 33K: A sharp first-order transition at T1=(33+-0.1)K slightly below the onset of a second-order transition at T2onset around (34+-0.1)K. The latter is accompanied by pronounced spontaneous strains. Our results are consistent with a structural transformation at T1 induced by the incipient spin-Peierls (SP) order parameter above T2=TSP.
Source:	arXiv, cond-mat/9710183
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