## Abstract

We present our recent results on the temperature dependence of current-voltage characteristics for polycrystalline Y_{1-x}Pr_{x}Ba_{2}Cu_{3}O_{7-δ } superconductors with x = 0.0, 0.1 and 0.3. The experimental results are found to be reasonably well fitted for all samples by a power like law of the form V = R (I - I_{c})^{a (T)}. Here, we assume that a (T) = 1 + Φ_{0} I_{C} (T) / 2 π k_{B} T and I_{C} (T) = I_{C} (0) (1 - T / T_{C})^{3 / 2} for the temperature dependences of the power exponent and critical current, respectively. According to the theoretical interpretation of the obtained results, nonlinear deviation of our current-voltage characteristics curves from Ohmic behavior (with a (T_{C}) = 1) below T_{C} is attributed to the manifestation of dissipation processes. They have a characteristic temperature T_{p} defined via the power exponent as a (T_{p}) = 2 and are related to the current induced depinning of Abrikosov vortices. Both T_{C} (x) and T_{p} (x) are found to decrease with an increase of Pr concentration x reflecting deterioration of the superconducting properties of the doped samples.

Original language | English |
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Pages (from-to) | 5089-5092 |

Number of pages | 4 |

Journal | Physics Letters, Section A: General, Atomic and Solid State Physics |

Volume | 372 |

Issue number | 30 |

DOIs | |

State | Published - 21 Jul 2008 |

### Bibliographical note

Funding Information:This work has been financially supported by the Brazilian agencies CNPq, CAPES and FAPESP.

## Keywords

- Current-voltage characteristics
- Vortex depinning
- YPrBaCuO

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