High-pressure synchrotron-diffraction study of the superconducting spin-ladder compounds (Sr,M)14Cu24O41 (M=Ca, Ba, Nd)
Stéphanie Pachot, Pierre Bordet, Robert J. Cava, Catherine Chaillout, Céline Darie, Michael Hanfland, Massimo Marezio, Hidenori Takagi
DOI 10.1103/PhysRevB.59.12048 · Physical Review B
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Abstract
The evolution of the cell parameters as a function of pressure of five samples of the spin-ladder compounds (Sr,M)14Cu24O41, with M=Ca, Ba, Nd has been investigated up to ≈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 ≈6 GPa in this system.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Sr14-xCax)Cu24O41 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12 | 3 GPa | onset |
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