<abstract xmlns="http://www.w3.org/1999/xhtml">In high Tc superconductors (HTSC) the activation energy gives information about the pinning properties of a sample under applied magnetic field. Pinning of vortices determines the critical current density Jc which is of great importance for practical applications of HTSC. Instead of magnetic measurements, the activation energy may be calculated from resistivity measurements realized under magnetic field. This kind of measurement has been made in this work for yttrium doped samples of Bi2Sr2CaCu2O8+d (Bi-2212) for different values of applied magnetic field. Samples of Bi2Sr2Ca1-xYxCu2O8+d (x = 0, 0.025, 0.1, 0.25) were prepared by a sol-gel method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive analysis of X-ray. The measurements of resistivity were made using a classical four probe method and DC current. The magnetic field was applied with a constant amplitude of 0 T, 1 T, 2 T and 3 T. The obtained results show that the activation energy decreases with introduction of yttrium, but has a relative maximum when x is equal 0.1. The decrease of the activation energy is explained by the granular nature of the samples which promotes 3D transition to 2D of the vortex lattice.</abstract>

In high Tc superconductors (HTSC) the activation energy gives information about the pinning properties of a sample under applied magnetic field. Pinning of vortices determines the critical current density Jc which is of great importance for practical applications of HTSC. Instead of magnetic measurements, the activation energy may be calculated from resistivity measurements realized under magnetic field. This kind of measurement has been made in this work for yttrium doped samples of Bi2Sr2CaCu2O8+d (Bi-2212) for different values of applied magnetic field. Samples of Bi2Sr2Ca1-xYxCu2O8+d (x = 0, 0.025, 0.1, 0.25) were prepared by a sol-gel method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive analysis of X-ray. The measurements of resistivity were made using a classical four probe method and DC current. The magnetic field was applied with a constant amplitude of 0 T, 1 T, 2 T and 3 T. The obtained results show that the activation energy decreases with introduction of yttrium, but has a relative maximum when x is equal 0.1. The decrease of the activation energy is explained by the granular nature of the samples which promotes 3D transition to 2D of the vortex lattice.

Effect Y substitution on the microstructure, transport and magnetic proprieties of Bi2Sr2Ca1Cu2O8+δ superconducting ceramics

Materials Science and Applications Research Unit, Physics Department

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Effect Y substitution on the microstructure, transport and magnetic proprieties of BiSrCaCuO superconducting ceramics

In high Tc superconductors (HTSC) the activation energy gives information about the pinning properties of a sample under applied magnetic field. Pinning of...

	a [Å])	b[Å]	c[Å]	V [Å³]	Rp [%]	GOF	T_{c, onset}	T_c0min	T_c0max
Y0	5.373657	5.401022	30.80966	894.1925	7.65	1.19	88	36.4	53.7
Y0025	5.373845	5.386960	30.60010	885.8328	10.28	2.94	82.4	11.8	27.8
Y010	5.391014	5.386136	30.51944	886.1846	10.15	3.46	106	28.7	37.8
Y025	5.401697	5.389121	30.30481	882.1852	8.83	2.47	90.5	6	13.6

Effect Y substitution on the microstructure, transport and magnetic proprieties of Bi₂Sr₂Ca₁Cu₂O_8+δ superconducting ceramics

Article Category: Research Article

Published Online: Sep 12, 2016

Page range: 582 - 590

Received: Nov 26, 2016

Accepted: Jun 03, 2016

DOI: https://doi.org/10.1515/msp-2016-0077

Keywords
high Tc superconductors, Y substitution, sol-gel method, activation energy, 3D to 2D transition

© 2016 S. Menassel et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Cell parameters (a, b, c), cell volume V, agreement factors (Rp) and goodness of fit (GOF) for the samples; values of the temperatures of transition onset: Tc, onset, Tc0max and Tc0min indicate the end of the zero resistance state without and with maximum applied magnetic field, respectively.

Effect Y substitution on the microstructure, transport and magnetic proprieties of Bi2Sr2Ca1Cu2O8+δ superconducting ceramics

Article Category: Research Article

Published Online: Sep 12, 2016

Page range: 582 - 590

Received: Nov 26, 2016

Accepted: Jun 03, 2016

DOI: https://doi.org/10.1515/msp-2016-0077

Keywordshigh Tc superconductors, Y substitution, sol-gel method, activation energy, 3D to 2D transition

© 2016 S. Menassel et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Cell parameters (a, b, c), cell volume V, agreement factors (Rp) and goodness of fit (GOF) for the samples; values of the temperatures of transition onset: Tc, onset, Tc0max and Tc0min indicate the end of the zero resistance state without and with maximum applied magnetic field, respectively.

Effect Y substitution on the microstructure, transport and magnetic proprieties of Bi₂Sr₂Ca₁Cu₂O_8+δ superconducting ceramics

Keywords
high Tc superconductors, Y substitution, sol-gel method, activation energy, 3D to 2D transition