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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
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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.

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M. Koeppen, D. Pankert, R. Hauptmann, M. Lang, M. Weiden, C. Geibel, F. Steglich. 1997-10-17. Interference of a first-order transition with the formation of a spin-Peierls state in alpha'-NaV2O5?. https://doi.org/10.1103/physrevb.57.8466

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