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Lattice anomalies in the FeAs$_{\rm 4}$ tetrahedra of the NdFeAsO$_{\rm 0.85}$ superconductor that disappear at T$_{\rm c}$

Autor: Calamiotou, M., Margiolaki, I., Gantis, A., Siranidi, E., Ren, Z. A., Zhao, Z. X., Liarokapis, E.

Publikováno v: EPL 91, 57005 (2010)

High resolution synchrotron X-ray powder diffraction (SXRPD) was used to study the temperature dependence of the oxygen deficient NdFeAsO$_{0.85}$ superconducting compound. By employing a dense temperature sampling we have managed to reveal unnoticed

Externí odkaz: http://arxiv.org/abs/1004.1340

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Pressure-induced lattice instabilities and superconductivity in YBa2Cu4O8 and optimally doped YBa2Cu3O7-{\delta}

Autor: Calamiotou, M., Gantis, A., Siranidi, E., Lampakis, D., Karpinski, J., Liarokapis, E.

Publikováno v: PRB 80, 214517 (2009)

Combined synchrotron angle-dispersive powder diffraction and micro-Raman spectroscopy are used to investigate the pressure-induced lattice instabilities that are accompanied by T$_{\rm c}$ anomalies in YBa$_{\rm 2}$Cu$_{\rm 4}$O$_{\rm 8}$, in compari

Externí odkaz: http://arxiv.org/abs/0907.3024

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Lattice effects in the La$_{\rm 2-x}$Sr$_{\rm x}$CuO$_{\rm 4}$ compounds

Autor: Liarokapis, E., Siranidi, E., Lampakis, D., Conder, K., Panagopoulos, C.

Publikováno v: J. Phys.: Condens. Matter 20 (2008) 434233

Systematic Raman studies on several cuprates (YBa$_{\rm 2}$Cu$_{\rm 3}$O$_{\rm x}$, YBa$_{\rm 2}$Cu$_{\rm 4}$O$_{\rm 8}$ or Bi$_{\rm 2}$Sr$_{\rm 2}$CaCu$_{\rm 2}$O$_{\rm 8}$) have shown that at optimal doping the compounds are at the edge of lattice

Externí odkaz: http://arxiv.org/abs/0902.2664

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