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

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Guguchia Z., Sheptyakov D., Pomjakushina E., Conder K., Khasanov R., Shengelaya A., Simon A., Bussmann-Holder A., Keller H.,
Project Interplay between the superconductivity and magnetism in cuprate and Fe-based superconductors
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Original article (peer-reviewed)

Volume (Issue) 92(2)
Page(s) 024508
Title of proceedings PHYSICAL REVIEW B
DOI 10.1103/physrevb.92.024508


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.