共查询到20条相似文献,搜索用时 0 毫秒
1.
2.
3.
4.
5.
Il Nuovo Cimento D - We report a set of experimental results on second- and third-harmonic generation at microwave frequencies in YBa2Cu3O7 single crystals near T c. The investigation of the... 相似文献
6.
7.
8.
We have measured the transport critical current densityJ
cof sintered YBa2Cu3O7, in various applied fields up to 185 Oe at 77 K. We find a sharp decay ofJ
cwith magnetic field. We show that this sharp decay is consistent with the low field hysteresis results of Groveret al. We argue that the observed field dependence is not caused by intragranular weak links. 相似文献
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
R. Feile P. Leiderer J. Kowalewski W. Assmus J. Schubert U. Poppe 《Zeitschrift für Physik B Condensed Matter》1988,73(2):155-160
We have performed detailed investigations on the temperature dependence of the 335 cm–1 phonon in single crystals and thin films of the YBa2Cu3O7 superconductor. The frequency of this phonon exhibits a downshift of about 5 cm–1 on passing the superconducting transition from above. The shift of the phonon in thin epitaxial films on MgO or SrTiO3 substrates is only about 2.5 cm–1. The width of the asymmetric phonon line displays a slight increase belowT
c due to the electron-phonon interaction in these systems. 相似文献