arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1201.0929cond-mat.str-el
收藏

自旋冰导电系统电阻率极小值的非Kondo机制

Non-Kondo mechanism for resistivity minimum in spin ice conduction systems

Masafumi Udagawa, Hiroaki Ishizuka, Yukitoshi Motome

摘要:

提出了与局域矩耦合的传导电子系统中电阻率极小值的一种机制,它不同于近藤效应。代替近藤效应中的自旋翻转过程,电子被局部自旋关联弹性散射,该局部自旋关联在随着温度降低的几何挫折下以特定的方式演化。这是证明了由元胞动力学平均场论的自旋冰型近藤晶格模型烧绿石晶格。在非近藤机制的电阻率,比热,和磁化率的温度依赖性与实验数据在金属铱烧绿石氧化物进行了比较。

英文摘要:

We present a mechanism of resistivity minimum in conduction electron systems coupled with localized moments, which is distinguished from the Kondo effect. Instead of the spin-flip process in the Kondo effect, electrons are elastically scattered by local spin correlations which evolve in a particular way under geometrical frustration as decreasing temperature. This is demonstrated by the cellular dynamical mean-field theory for a spin-ice type Kondo lattice model on a pyrochlore lattice. Peculiar temperature dependences of the resistivity, specific heat, and magnetic susceptibility in the non-Kondo mechanism are compared with the experimental data in metallic Ir pyrochlore oxides.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑