Effects of defect morphology on the properties of the vortex system in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} irradiated with heavy ions
To study the effects of defect morphology on vortex dynamics, reversible magnetization, and c-axis magnetoresistance, Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} single crystals are irradiated with heavy-ions; 0.7-GeV{sup 84}Kr, 3.5-GeV{sup 136}Xe, 3.8-GeV{sup 181}Ta, and 3.1-GeV{sup 209}Bi. First, defect morphology is investigated by transmission electron microscope (TEM) observations, which reveals that the fluctuation of defect radius along the ion path increases with decreasing the electronic-stopping power for the incident ion S{sub e}. The frequency dependence of the loss-peak temperature, where the imaginary part of ac susceptibility reaches a maximum, shows that the power-law behavior of a Bose-glass transition appears only for the irradiation with {l_angle}S{sub e}{r_angle}{approx_gt}1.9keV/Aa, where {l_angle}S{sub e}{r_angle} is the mean value of S{sub e} in the sample. The magnetic-field dependence of reversible magnetization clearly shows the feature of the recoupling of vortices along the c axis only for Ta and Bi irradiations with {l_angle}S{sub e}{r_angle}{approx_gt}3.3keV/Aa. The magnetoresistance along the c axis also reveals that the recoupling of vortices caused by the production of columnar defects takes place when {l_angle}S{sub e}{r_angle}{approx_gt}3.3keV/Aa. The present results demonstrate that the fluctuation in the defect radius along the ion path suppresses the Bose-glass transition and the recoupling of vortices along the c axis.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40203456
- Journal Information:
- Physical Review B, Vol. 63, Issue 22; Other Information: DOI: 10.1103/PhysRevB.63.224502; Othernumber: PRBMDO000063000022224502000001; 019122PRB; PBD: 1 Jun 2001; ISSN 0163-1829
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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