Er_(1-x)Dy_xNi_2B_2C体系中超导和磁性的共存和相互作用(英文)  

COEXISTENCE AND INTERPLAY BETWEEN SUPERCONDUCTIVITY AND MAGNETISM IN Er_(1-x)Dy_xNi_2B_2C SYSTEM

作　　者：曹世勋[1] 秦晓玲[1] 李平林[1] 曹桂新[1] 张金仓[1] 森克德 西村克彦 

机构地区：[1]上海大学理学院物理系,上海200436 [2]富山大学工学部

出　　处：《低温物理学报》2003年第4期241-246,共6页Low Temperature Physical Letters

基　　金：国家自然科学基金 (No .1 0 2 74 0 4 95 0 2 340 2 0 );上海市科委纳米专项基金 (No .0 1 5 2nm0 2 7);上海市教委重点学科建设项目;上海市教育委员会高校科技发展基金 (No .0 2AK4 2,No .0 1A1 6 )的资助项目~~

摘　　要：本文在 2K～ 2 0K温区内系统地研究了Er1-xDyxNi2 B2 C体系中超导转变温度Tc 的反铁磁转变温度TN 随Dy掺杂含量x的变化 .实验发现x =0 .3和x =0 .8附近的样品具有复杂的磁结构 .这些样品有两个磁转变温度 (T \-N′和TN) .对于该体系发现了两个主要的特征 :1 )在x =0 .3附近 ,超导被抑制 ,TN′出现一个小的峰值 ;2 )在x =0 .8附近 ,Tc 出现一个低谷 ,TN′出现一个大的宽峰 .TN′在x =0 .3和x =0 .8附近的异常来源于改系统中超导和磁性的共存和相互作用 .The variations of the superconducting transition temperature T-c and the magnetic transition temperature T-N against the Dy concentration x in Er-{1- x }Dy- x Ni-2B-2C system were systematically investigated in the temperature range from 2K to 20K. It is found that the magnetic structures are complicated in the samples near x =0.3 and x =0.8. These samples have two magnetic transition temperatures ( T-{N′} and T-N ). Two features have been observed; 1) near x =0.3, superconductivity is depressed and T-{N′} showed a small peak, 2) around x =0.8, T-c showed a valley and T-{N′} showed a large broad peak. These anomalies of T-c at x =0.3 and near x =0.8 originates from the coexistence and interplay between superconductivity and magnetism in this system.

关 键 词：Er1-xDyxNi2B2C体系 超导电性 磁性 输运行为 相互作用 共存性 反铁磁性 

分 类 号：O511.4[理学—低温物理]