Effect of high pressure on the fluctuation conductivity and the charge transfer of YBa2Cu3O7− single crystals

Phase separation in oxygen deficient ΗοBa2Cu3O7-δ single crystals: effect of high pressure and twin boundaries

“…under a specific oxygen non-stoichiometry [1][2][3][4][5]. This can be initiated by external means, such as temperature [1] or high pressure [5].…”

“…This can be initiated by external means, such as temperature [1] or high pressure [5]. The non-equilibrium state cab be accompanied by a redistribution process of the labile oxygen and structural relaxation, which in turn can affect substantially the electro-transport parameters of the system [1,2,5].…”

“…Their change affects the crystalline field, forming the electronic structure of this ion [7]. A characteristic peculiarity of the oxygen deficit samples (with δ ≥ 0.3) is the broadening of the resistivity transfers under pressure [5,8,9]. The reason of such behavior has not been completely determined.…”

“…Notably, a substantial part of the experimental material was ceramic and polycrystalline samples with a high content of grain boundaries (intergrain bonds) [4,8,9]. In the case of single crystals the existence of twin boundaries (TB) [5] influences the transport properties in the normal state. This aspect is not yet sufficiently studied, due to experimental difficulties in determining the contribution of these defects.…”

Infrared study of defects in nitrogen-doped electron irradiated silicon

“…Local strain and/or pressure variations can impact materials properties [71][72][73][74][75] and as such we aim to investigate the effect of the introduction of large N concentrations on the production and stability of related clusters and VO defects in Si.…”