کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9841709 | 1525795 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Observation of vortex phase transition in MgB2 single crystals by a magnetic torque method
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Observation of vortex phase transition in MgB2 single crystals by a magnetic torque method Observation of vortex phase transition in MgB2 single crystals by a magnetic torque method](/preview/png/9841709.png)
چکیده انگلیسی
The magnetic torque measurements were performed on two MgB2 single crystals with the different values of upper critical fields Hc2 (3.7Â T and 3.1Â T at 4.2Â K). At low temperatures, the irreversible torque-vs-field curves Ï(H) in the both samples show the peak effect, accompanied by the field-history dependence, close to Hc2 for all the field directions measured. With increasing temperature, the peak in Ï(H) becomes less pronounced, and disappears around TÂ =Â 27Â K. In the sample with smaller Hc2, Ï(H) curves display diamagnetic steps at the higher temperatures. On the other hand, in the sample with larger Hc2, such a step is not observed. Our results suggest that the order-disorder transition around the peak transforms to the first-order melting transition, which is very sensitive to the degree of disorder.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica C: Superconductivity - Volumes 426â431, Part 1, 1 October 2005, Pages 163-168
Journal: Physica C: Superconductivity - Volumes 426â431, Part 1, 1 October 2005, Pages 163-168
نویسندگان
T. Nojima, H. Nagano, H. Maruyama, Y. Watanabe, A. Ochiai, H. Aoki,