High-pressure study of the new Y-Ba-Cu-O superconducting compound system

Enhanced superconductingTcin the immiscible system (La1.85SrPark1, Zhang2, Lee3 et al. 2011Phys. Rev. B4000View full textAdd to dashboardCite

“…In Y123:Y211, the strain induced by the different thermal contraction of the two phases has been also reported [11]. On the other hand, pure Y123 shows little hydrostatic pressure effect of T c , consistent with the observed minimal change of T c in Y123:Y211 [33]. Note that Welp et al reported that the small hydrostatic pressure effect on fully oxygenated Y123 stems from the cancellation of 8 opposite effects along the a and b directions, while the c axis changes little under pressure [34].…”

High temperature superconductivity in SmBa2Cu3O 7-x : transport properties and effect of pressure

“…Pressure both decreases the resistivity in the normal state and increases the superconducting temperature, as has been found in the Y compound as well as in other Ln (Gd, Er, Yb) compounds [37,38]. However, the values of dTc/dP obtained in the Sm compound of 0.4 to 0.5 K kbar-1 are larger than those reported for other materials (0.09 to 0.19 K kbar-1) in Ref.…”

High Pressure Effects on Superconductivity

“…A large amount of scientific work was devoted to this particular compound. In it's optimal doping state (δ≈0.05, T c =93 K) the application of pressure had a negligible effect on T c [48], a property that is common for many of the optimally doped HTS compounds. With increasing δ YBa 2 Cu 3 O 7-δ becomes under-doped and more oxygen vacancies are created in the CuO chains.…”

“…In simulating the external pressure effect (lattice contraction) by replacing La 3+ with the smaller ion Y 3+ a new superconducting compound system, Y-Ba-Cu-O (YBCO), was synthesized with an onset temperature of T c =93 K [17]. Interestingly, the application of external pressure did not change the T c notably but rather caused a broadening of the resistive transition into the superconducting state [48]. The origin of this striking difference to the large pressure coefficient of LBCO was attributed to the presence of the large chemical pressure associated with the smaller Y 3+ ions.…”