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Superconducting critical currents $j_{c} > 10^{5}$ A/cm$^{2}$ at temperatures$T \sim 50$ K and magnetic fields $B \sim 6$ T are reported for theYBa$_{2}$Cu$_{3-x}$Mo$_{x}$O$_{7+d}$ compound with $x = 0.02$. Clear evidencefor the increased pinning force $F_p$ was found from a peak effect present for$j_{c}(B)$. The pinning force was analyzed by a scaling procedure usingKramer's approach. For a wide range of fields and temperatures, we were able toexpress all $F_p$ data as a single function of a reduced field $b = B/B_k$,where the scaling field $B_{k} << H_{c2}$ was related to the irreversibilityfiled $B_{irr}$. Analyses of the field dependence of $j_{c}(B,T)$ and$F_{p}(b)$ show that the effective pinning centers act as weakly interactingextended point-like defects. We propose that the pinning centers are randomlydistributed small defects, most likely the dimers of MoO$_6$ octahedra in theCuO chains.Comment: 12 pages, 11 figure

physical review. b, condensed matter and materials physics

Increase of critical currents and peak effect in Mo-substituted<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>YBa</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Cu</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:mrow></mml:math>

Increase of critical currents and peak effect in Mo-substitutedYBa2Cu3O7