ISSN:
1573-7357
Schlagwort(e):
74.30.Ci
;
74.60.Ge
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Abstract The second peak effect in magnetization curves for overdoped (La1−xSrx)CuO4−δ single crystals was examined by means of systematic variations of Sr content x and oxygen deficiency δ. Oxygen defect concentration was found to sensitively affect the critical temperature Tc and the macroscopic pinning force Fp, resulting in significant changes in magnetization hysteresis loops. Observations of δ dependence of ΔM and Fp at the same reduced temperature T/Tc yielded an insight into the role of oxygen defects: increasing δ results in increasing the pinning center density N. The second peak field B2pk seemed to be determined by the development of a percolating network of magnetically reversible regions from the observation that the temperature dependence of B2pk showed similar behavior to the irreversibility field Birr.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00753863
Permalink
