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Oxygen isotope effects on lattice properties of La2-xBaxCuO4 (x = 1/8)

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Simon,  A.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Bussmann-Holder,  A.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Department Electronic Structure Theory (Ali Alavi), Max Planck Institute for Solid State Research, Max Planck Society;
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;
Department Nanochemistry (Bettina V. Lotsch), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Guguchia, Z., Sheptyakov, D., Pomjakushina, E., Conder, K., Khasanov, R., Shengelaya, A., et al. (2015). Oxygen isotope effects on lattice properties of La2-xBaxCuO4 (x = 1/8). Physical Review B, 92(2): 024508.


Cite as: https://hdl.handle.net/21.11116/0000-000E-CAE0-1
Abstract
A negative oxygen-isotope (O-16/O-18) effect (OIE) on the low-temperature tetragonal (LTT) phase-transition temperature T-LTT was observed in La2-xBaxCuO4 (x = 1/8) using high-resolution neutron powder diffraction. The corresponding OIE exponent alpha T-LTT = -0.36(5) has the same sign as alpha T-so = -0.57(6) found for the spin-stripe order temperature T-so. The fact that the LTT transition is accompanied by charge ordering (CO) implies the presence of an OIE also for the CO temperature T-co. Furthermore, a temperature-dependent shortening of the c axis with the heavier isotope is observed. These results combined with model calculations demonstrate that anharmonic electron-lattice interactions are essential for all transitions observed in the stripe phase of cuprates.