IRREVERSIBILITY LINE AND MAGNETIC-RELAXATION IN A SM1.85CE0.15CUO4-Y SINGLE-CRYSTAL

被引:33
作者
ALMASAN, CC [1 ]
SEAMAN, CL [1 ]
DALICHAOUCH, Y [1 ]
MAPLE, MB [1 ]
机构
[1] UNIV CALIF SAN DIEGO,INST PURE & APPL PHYS SCI,LA JOLLA,CA 92093
来源
PHYSICA C | 1991年 / 174卷 / 1-3期
关键词
D O I
10.1016/0921-4534(91)90424-W
中图分类号
O59 [应用物理学];
学科分类号
摘要
We report on the static and dynamic magnetic behavior of a Sm1.85Ce0.15CuO4-y single crystal for fields ranging from 20 Oe to 6 kOe. The irreversibility line, extracted from static magnetization versus temperature measurements in different magnetic fields H, shows power law behavior with an exponent that changes at approximately 1 kOe from 1.7. for fields H less-than-or-equal-to 1 kOe to 3.5 for H greater-than-or-equal-to 1 kOe. The magnetic relaxation study shows that for values of the applied field greater than 600 Oe, an extrapolation of the normalized relaxation rate S(n) to zero temperature gives a non-zero value. This may be indicative of nonthermally activated relaxation processes. For 1 kOe, S(n) versus temperature exhibits two peaks, a possible indication of the presence of two pinning mechanisms. A distribution of activation energies for the pinning barriers was inferred to explain the experimental observations. The distribution functions were calculated from magnetic relaxation data taken in different applied magnetic fields.
引用
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页码:93 / 100
页数:8
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