摘要
实验研究了高温超导体Hg09Tl02Ba2Ca2Cu3O8+δ的低温热导率与温度和磁场的关系,测量温度为7—20K,外加磁场为0—6T.结果表明,在不同外场下,超导体的热导率在实验温区内随温度的增加均单调增加;在固定的温度下外加磁场使超导体的热导率减小,并随外磁场的增加达到一个稳定值;热导的相对变化率κ(H)/κ(0)与磁场的关系以及热导率达到稳定值的磁场与测量温度有关.
The thermal conductivity κ(H,T) of Hg 0 9 Tl 0 2 Ba 2Ca 2Cu 3O 8+ δ superconductor with a transition temperature of 128?K has been measured between 7—20?K and in magnetic fields of 0—6 Tesla. κ(H,T) of the sample increases monotonically with increasing temperature in all investigated fields. It is significantly reduced upon the application of the magnetic field and finally reaches a field\|independent value. The effects of magnetic field on the thermal conductivity for Hg 0 9 Tl 0 2 Ba 2Ca 2Cu 3O 8+ δ superconductor can be attributed to an additional thermal resistivity due to the scattering of the normal electrons by vortices.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第2期267-271,共5页
Acta Physica Sinica
基金
国家超导研究和开发中心
中国科学院物理研究所极低温物理开放实验室资助的课题
