Viswanath, N. V. N. ; Rajasekharan, T. ; Menon, Latika ; Harish Kumar, N. ; Malik, S. K. ; Dey, G. K. ; Upadhyaya, D. D. (1997) Origin of peak effect in the magnetization hysteresis loop of melt-processed REBa2Cu3Oy superconductors Applied Physics Letters, 71 (26). pp. 3895-3897. ISSN 0003-6951
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Official URL: http://apl.aip.org/resource/1/applab/v71/i26/p3895...
Related URL: http://dx.doi.org/10.1063/1.120536
Abstract
Melt-processed Sm-123 samples with an excess Sm2BaCuOy (Sm-211) phase is studied by transmission electron microscope (TEM) and superconducting quantum interference device magnetometer, to explain the origin of the peak effect exhibited in the magnetization hysteresis loops of light RE-123 samples in intermediate fields at 77 K. TEM images of the sample showing peak effect reveal dilute concentrations of areas with ortho-II structure distributed on a nanometer scale within the twin regions of the sample. The ortho-II structure is an oxygen deficient 123 with a lower Tc than the bulk of the material and will be a source of flux pinning by turning normal in high fields, thus contributing to the peak effect. With an increase in Sm-211 concentration, the peak effect disappears from the hysteresis loop, as does the ortho-II structure in the TEM images.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Institute of Physics. |
| Keywords: | High-temperature Superconductors; Samarium Compounds; Barium Compounds; Magnetic Hysteresis; Flux Pinning; Spinodal Decomposition; Samarium Oxides; Barium Oxides; Copper Oxides; Structural Chemical Analysis; Magnetization; Twinning; Transmission Electron Microscopy; Magnetic Flux; X-ray Diffraction |
| ID Code: | 82484 |
| Deposited On: | 10 Feb 2012 15:28 |
| Last Modified: | 10 Feb 2012 15:28 |
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