Angular dependence of the magnetic properties of thin YBa2Cu3O7 − δ films irradiated with Pb and Xe ions

doi:10.1016/0921-4534(94)90579-7

Physica C: Superconductivity

Volume 234, Issues 3–4, 15 December 1994, Pages 311-317

https://doi.org/10.1016/0921-4534(94)90579-7 Get rights and content

Abstract

We study the angular dependence of the magnetic properties of Y-ba-Cu-O thin films irradiated with 0.86 GeV Pb and 5 GeV Xe ions. For the Pb irradiated samples the critical current has a maximum when the direction of the external magnetic field coincides with the direction of the columnar defects induced by the irradiation. For the Xe irradiated samples such anisotropy in the critical current was not found. The pinning force density obeys a scaling law of the form b^p(1 − b)^q, where b = H_ext/H_irr (T), and H_ext and H_irr are the external and the irreversibility fields, respectively. The exponents p and q depend on the type and direction of the irradiation.

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Citation Excerpt :
Trappeniers et al. studied columnar defects due to Kr ions in single crystal of YxTm(1−x)Ba2Cu3O7 which considerably enhanced Jc, Fp and irreversibility field [16]. 0.86 GeV Pb+ ions produced continuous columnar defects that showed high Jc values when the field direction coincided with tracks direction in YBCO films. [17]. Civale et al. [18] and Budhani et al. [19] have shown significant rise in Fp in YBCO and Tl2Ba2Ca2Cu3O10 films, respectively by heavy-ion-irradiation.
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LaCaBaCu3O7 is a high critical temperature superconductor (HTS) below the Tc = 80 K and its structure is similar to that of YBCO. In this work we study the effect in the irreversibility line and the Curie-Weiss temperature of this superconductor after borate (BO3)^3-doping (LaCaBaCu3-x(BO3)xO7-δ x=0.2 and 0.3). Interestingly, borate doping enhances the irreversibility line and this effect is probably caused from alteration the arrangement of the oxygen atoms in the crystalline structure. Moreover, the Curie-Weiss temperature (□p) in the normal state increases with doping concentration. Calculated □p for pure LaCaBaCu3O7 is around -98K, this value increases to -75 and 49 K for x=0.2 and 0.3 respectively and indicating transition from antiferromagnetic to ferromagnetic coupling between ions in the structure. This study provides additional data for the magnetic characteristics of doped like-123 crystalline structures with oxyanions.
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Angle dependent magnetoresistance of the 250 MeV Ag⁺¹⁷ ion irradiated YBa₂Cu₃O_7−δ melt-textured sample and polycrystalline films have been carried out to study the pinning behaviour in the presence of columnar defects. Bose glass scaling laws, both to the melt-textured sample and polycrystalline film have been applied uniquely to the angle dependent magnetoresistance to determine the critical static (v^′), dynamic (z^′) exponents and the critical angle (θ_cri). The values were found to be v^′∼1.0 and z^′∼4.0, respectively for both irradiated melt-textured sample and polycrystalline film. The scaling laws are found to hold good below the critical angle which is found to be different in these samples. The Bose glass temperature ‘T_BG’ is found to be maximum along the columnar defects. Besides, the vortex binding energy per unit length has been computed.
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Angular dependence of the magnetic properties of thin YBa2Cu3O7 − δ films irradiated with Pb and Xe ions

Abstract

Nucl. Instr. and Meth. B

Physica C

Appl. Phys. Lett.

Phys. Rev. Lett.

Phys. Rev. B

Phys. Rev. Lett.

Appl. Phys. Lett.

Phys. Rev. B

Physica C

Phys. Rev. B

Appl. Phys. Lett.

Angular dependence of the magnetic properties of thin YBa₂Cu₃O_{7 − δ} films irradiated with Pb and Xe ions