SUSCEPTIBILITY AND MAGNETIZATION OF THE DILUTED SPINGLASSES PDFE AND PTFE

被引:5
作者
HERRMANNSDORFER, T
REHMANN, S
UNIEWSKI, H
POBELL, F
机构
[1] Physikalisches Institut, Universität Bayreuth
来源
PHYSICA B | 1994年 / 194卷 / pt 1期
关键词
Magnetic materials;
D O I
10.1016/0921-4526(94)90489-8
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
We have measured the static susceptibility of Pd- and Pt-samples with Fe-concentrations 4ppm less-than-or-equal-to X(Fe) less-than-or-equal-to 440ppm at temperatures 4.2K less-than-or-equal-to T less-than-or-equal-to 300K and magnetic fields 0.05T less-than-or-equal-to B less-than-or-equal-to 6. 00T with a Squid magnetometer. The samples show field independent static Curie susceptibilities; the Fe- concentrations were calculated from the Curie-constants. For the Pd-samples with X(Fe)=4 and 34ppm we have measured the complex 16Hz-susceptibility chi*=chi' + ichi'' at B less-than-or-equal-to 15mT in the temperature range 70muK less-than-or-equal-to T less-than-or-equal-to 300 mK. We find spinglas freezing temperatures T(f) (maxima of chi') at T(f)4ppm = 0.7mK and T(f)34ppm = 3.3mK. The samples show chi' is-proportional-to T-1 at T greater-than-or-equal-to 3.T(f) and chi' -chi(o)' is-proportional-to T at 70muK less-than-or-equal-to T less-than-or-equal-to 1/3.T(f). For the Pt samples we measured chi* at B less-than-or-equal-to 7mT and 6mK less-than-or-equal-to T less-than-or-equal-to 300 mK and got T(f)31ppm = 7.5 mK and T(f)88ppm = 22mK. The samples show chi' is-proportional-to T-1 at T greater-than-or-equal-to 3.T(f).
引用
收藏
页码:319 / 320
页数:2
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