Engineering
Engineering
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(1999) Bandyopadhyay, Srikanta; Gowripalan, Nadarajah; Rizkalla, S; Dutta, P; Bhattacharyya, DConference Paper
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(1998) Gu, Genda; Han, Shaowei; Lin, Zheng; Zhao, Yong; Russell, GraemeJournal Article
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(1999) Bandyopadhyay, Srikanta; Kao, G; Gowripalan, Nadarajah; Postle, RonaldConference Paper
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(1999) Han, Shaowei; Zhao, Yong; Choi, C; Andrikidis, CJournal ArticleFlux pinning force and irreversibility lines have been investigated for melt-textured YBa2Cu3Oy crystals containing Y2BaCuO5 (211) particles with an average size ranging from 20 to 0.02 microns. We found that the irreversibility lines are increasingly improved and that the pinning force as well as the Jc is greatly enhanced as the average size of the 211 particles decreases. The Fp-H curve exhibits two peaks in the samples containing very fine 211 particles (nanometer size particles), which suggests that an addition pinning mechanism is involved in this type of samples. The experimental results can be well explained with combining the interface-pinning mechanism and the match effect.
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(1998) Han, Shaowei; Zhao, Yong; Gu, Genda; Russell, GraemeJournal ArticleDuring magnetoresistance measurement of Bi-2212 single crystals, we found the resistance in the c-axis direction exhibited a huge magnetic enhancement (H perpendicular to the a-b-plane) while the onset transition temperature along the c-axis showed a large depression when the magnetic fields were over a certain value (H > 180 Oe). No such phenomena were observed in small applied magnetic fields (H < 180 Oe) and in a-b-plane magnetoresistance measurements. By changing different probes (eight probes being attached to the sample, each side having four probes) for the measurement of the magnetoresistance along the c-axis with H = 2000 Oe, we found that the resistance along the c-axis in the temperature region T/Tc > 0.90 was only related to the measuring dimensions and Tc onset remained unchanged. Our results provided evidence that both Lorentz-force-independent fluctuation-induced dissipation and Lorentz-force-dependent vortex motion dissipation exist in the mixed state.
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(1999) Gosbell, Iain; Ross, Alfred; Turner, IanJournal Article
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(1998) Han, Shaowei; Zhao, Yong; Gu, Genda; Russell, GraemeJournal Article
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(1998) Han, Shaowei; Zhao, Yong; Yang, C; Cheng, Chun-Chung; Zhang, Hua; Gu, Genda; Russell, Graeme; Koshizu, NJournal Article
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(1998) Han, Shaowei; Zhao, Yong; Yang, C; Cheng, Chun-Chung; Zhang, Hua; Gu, Genda; Russell, Graeme; Koshizuka, NJournal ArticleThe vortex-glass-liquid transition in Bi---Sr---Ca---Cu---O (BSCCO) intergrowth single crystals in which some CuO2 trilayers are inserted into the Bi2Sr2CaCu2O8 matrix has been studied. The curvature of the log V-logI curves for CuO2 trilayers is found to change from negative to positive with increasing magnetic field and a scaling behaviour for the vortex-glass state is observed. The magnetic field dependence of the vortex-glass transition temperature, TG, qualitatively obeys the relation H(TG) (Tc − Tg)2v0, with v0 = 1.15 ± 0.2, which is larger than the 2/3 predicted theoretically for an isotropic 3D system. Our results reveal that the vortex-glass transition exists in a system constructed with CuO2 trilayers.
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(1999) Timms, Wendy; Acworth, Richard; Jankowski, Jerzy; Lawson, SConference Paper