Conductivity of single-crystal Y1−yPryBa2Cu3O7−δ over a wide range of temperatures and Pr concentrations

Abstract

Articles you may be interested inEffect of pressure on the critical temperature of single-crystal Y0.95Pr0.05Ba2Cu3O7-δ with a specified planar defect geometry Low Temp.

Composition variation and electron irradiation effects on the fluctuation conductivity in Y1–zPrzBa2Cu3O7−δ single crystals

“…(5) increases from 1.44 Å to 2.07 Å with decrease of T c . This observation is in a qualitative agreement with the dependence of nc(0) on d obtained for YBCO samples [48] in the course of a step-by-step decrease of the oxygen concentration and increase of the praseodimium content [19,34].…”

“…For instance, irradiation of YBCO with fast electrons leads to a gradual increase of the electrical resistivity and a reduction of Tc without essential alteration of the oxygen stoichiometry [33]. As for the substitution of yttrium by praseodimium [34,35], it should be noted that Pr, in contrast to other RE elements, allows one to vary T c from the maximal value to zero while keeping the oxygen concentration at the optimal level [32][33][34][35][36]. In this way, both approaches allow one to vary the critical and electronic transport characteristics of RBa 2 Cu 3 O 7-d without affecting stability of the oxygen subsystem that is especially important from the viewpoint of their technological applications [14].…”

Transverse resistance of YBa2Cu3O7−δ single crystals

“…The crystals' typical dimensions were 2 Â 0.3 Â 0.02 mm 3 , whereby the smallest size corresponds to the c-axis. The electrical resistance was measured with a dc current in the eight-probe geometry [31] relying upon the Montgomery method [32,33].…”

Effect of high pressure on temperature dependences of the resistivity in the ab-plane of Y0.77Pr0.23Ba2Cu3O7-δ single crystals

“…Firstly, the compounds of the 1-2-3 system have a sufficiently high T c , making it possible to carry out measurements at temperatures exceeding the temperature of liquid nitrogen [9,10]. Secondly, the partial replacement of Y with Pr, in contrast to replacement with other rare earth elements, allows smoothly varying the electrical resistance and critical characteristics of this compound by gradually suppressing their conducting parameters [11][12][13][14] (the so-called ''praseodymium anomaly''). Thirdly, in the Y 1-x Pr x Ba 2 Cu 3 O 7-d compounds with the optimal oxygen content [15,16], the so-called nonequilibrium state does not arise, which in pure oxygen-deficient YBa 2 Cu 3 O 7-d samples can be quite easily induced by a jump in temperature, aging [17,18] or high-pressure applications [19,20].…”