在低载体密度Kondo格子YbRh3Si7中的异常超磁性
Binod K Rai1, S Chikara2, Xiaxin Ding2
1Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA.
Physical review. X
|October 14, 2024
概括
这项研究揭示了Ytterbium Rhodium Silicide (YbRh3Si7) 反铁磁体中意想不到的超磁性转变. 这些转换强烈地合了磁性和电子性质,挑战了对这种新的Kondo材料的现有理论.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 磁力学 磁力学 是一种
背景情况:
- 康多反铁磁体是由于局部磁矩和导电电子之间的相互作用而表现出复杂的磁性排序的材料.
- YbRh3Si7是一种新合成的低载波康多抗铁磁体,具有创新电子和磁现象的潜力.
- 超磁性转换,即应用磁场下的磁化突然变化,通常在特定的磁性结构中观察到.
研究的目的:
- 研究单晶YbRh3Si7.7的磁性和相变的研究.
- 了解这种材料中磁性排序和电传输之间的关系.
- 探索在磁场下观察到的意想不到的超磁性行为的起源.
主要方法:
- 在YbRh3Si7.7.的单晶生长.
- 电力传输,磁化和特定热量测量.
- 高磁场磁化,扭矩和电阻的测量.
- 用中子衍射来确定磁体结构.
主要成果:
- 在TN=7.5K时,反铁磁顺序得到了确认,磁矩在ab平面上对齐.
- 在6.7 T和21 T的c轴上观察到两个令人惊的超磁性转变.
- 第一个转换增加了电阻,而第二个转换大大降低了电阻,表明了强大的电子磁合.
- 当磁场偏离c轴时,超磁性过渡场会转移到更高的值.
结论:
- 在YbRh3Si7中观察到的超磁性是异常的,因为它具有线性反铁磁结构.
- 磁性和电子自由度之间的强烈合是显而易见的.
- 异常的超磁性可能源于晶体电场异性和异性交换相互作用之间的竞争.
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