High-pressure synchrotron-diffraction study of the superconducting spin-ladder compounds(Sr,M)14Cu24O41(M=Ca,Ba, Nd)
| Autor: | Robert J. Cava, Catherine Chaillout, Michael Hanfland, M. Marezio, Hidenori Takagi, Céline Darie, Pierre Bordet, Stéphanie Pachot |
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| Rok vydání: | 1999 |
| Předmět: | |
| Zdroj: | Physical Review B. 59:12048-12053 |
| ISSN: | 1095-3795 0163-1829 |
| Popis: | The evolution of the cell parameters as a function of pressure of five samples of the spin-ladder compounds $(\mathrm{Sr},{M)}_{14}{\mathrm{Cu}}_{24}{\mathrm{O}}_{41},$ with $M=\mathrm{Ca},$ Ba, Nd has been investigated up to \ensuremath{\approx}10 GPa by high-pressure synchrotron x-ray diffraction on the ID9 beam line of the ESRF. A large anisotropy of compressibility is observed, with a very strong compression along the b axis, corresponding to the stacking direction of the ladder and chain layers. A striking lattice anomaly is detected in the 5--8 GPa range, depending on composition. It consists of an abrupt increase of the a parameter value, a measure of the in-plane separation between ladders, with increasing pressure. This anomaly could play a role in the disappearance of superconductivity above \ensuremath{\approx}6 GPa in this system. |
| Databáze: | OpenAIRE |
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