Structural transitions in a doped lanthanum cuprate
S.-H. Baek, P. C. Hammel, M. Hücker, B. Büchner, U. Ammerahl, A. Revcolevschi, B. J. Suh
DOI 10.1103/PhysRevB.87.174505 · Physical Review B
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Abstract
139La NMR and relaxation measurements have been performed on La1.8−xEu0.2SrxCuO4 (x=0.13 and 0.2) single crystals. The temperature dependence of the 139La NMR spectra in all the structural phases [high-temperature tetragonal (HTT) → low-temperature orthorhombic (LTO) → low-temperature tetragonal (LTT)] reveals the nonvanishing tilt angle of the CuO6 octahedra in the HTT phase, opposed to the case of La2−xSrxCuO4 where the tilt angle disappears immediately above the transition. Since 139La relaxation data provide evidence of the thermodynamic critical fluctuations associated with the structural phase transitions, HTT → LTO and LTO → LTT, we conclude that the structural transitions in Eu-doped La2−xSrxCuO4 should be of the order-disorder type rather than of the displacive type observed in La2−xSrxCuO4. The change of the nature of the structural transitions caused by doping with Eu appears to be consistent with the LTO → LTT transition that is absent in La2−xSrxCuO4.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.8-xEu0.2SrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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