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VOLUME 46 (1987) | ISSUE 10 | PAGE 402
Structural anomalies in compounds of the type La2CuO4
The structural anomalies in La2 _ x Srx Cu04 and YBa2Cu307 [ D. Mc K. Paul et aL, Phys. Rev. Lett. 58,1976 (1987); N. B. Brandt etaL, Proceedings of the All-Union Working Conference on High-Temperature Superconductivity, Sverdlovsk, 1987; A. I. Golovashkin etal.y JETP Lett, (in press) ] are explained in terms of the presence of the Fermi surface of a van't Hoff singularity. These anomalies indicate that there is a soft mode which is not related to the structural transition.