Persistent Detwinning of Iron-Pnictide EuFe_{2}As_{2} Crystals by Small External Magnetic Fields.
Persistent Detwinning of Iron-Pnictide EuFe_{2}As_{2} Crystals by Small External Magnetic Fields.
复制标题
DOI：
10.1103/physrevlett.113.227001
复制
发表时间：
2014-08
影响因子：
8.6
通讯作者：
S. Zapf;C. Stingl;Kirk Post;J. Maiwald;J. Maiwald;N. Bach;I. Pietsch;D. Neubauer;A. Löhle;C. Clauss;S. Jiang;H. Jeevan;Dimitri Basov;P. Gegenwart;P. Gegenwart;M. Dressel
中科院分区：
文献类型：
--
作者：
S. Zapf;C. Stingl;Kirk Post;J. Maiwald;J. Maiwald;N. Bach;I. Pietsch;D. Neubauer;A. Löhle;C. Clauss;S. Jiang;H. Jeevan;Dimitri Basov;P. Gegenwart;P. Gegenwart;M. Dressel
我们对EuFe_(2)As_(2})的综合研究表明，由于Eu~(2+)离子的间接磁弹性耦合，与其他AFE_(2)As_(2})(A=Ba，Sr，Ca)铁化合物相比，EuFe_(2})As_(2})的去孪生磁场显著降低。我们发现，在局部Eu^{2+}有序度以下，只有∼0.1T才足以实现持久脱孪晶；在T_{Eu}=19K以上，需要更高的场。即使在关闭磁场后，孪晶磁区的显著不平衡仍保持不变，直到结构和电子相变(190K)。这种持久的退孪晶为研究铁辉石的低温电子面内各向异性提供了独特的可能性，而无需施加任何破坏对称性的外力。
Our comprehensive study on EuFe_{2}As_{2} reveals a dramatic reduction of magnetic detwinning fields compared to other AFe_{2}As_{2} (A=Ba, Sr, Ca) iron pnictides by indirect magnetoelastic coupling of the Eu^{2+} ions. We find that only ∼0.1 T are sufficient for persistent detwinning below the local Eu^{2+} ordering; above T_{Eu}=19 K, higher fields are necessary. Even after the field is switched off, a significant imbalance of twin domains remains constant up to the structural and electronic phase transition (190 K). This persistent detwinning provides the unique possibility to study the low temperature electronic in-plane anisotropy of iron pnictides without applying any symmetry-breaking external force.