Persistent detwinning of iron pnictides by small magnetic fields
| Autor: | Zapf, S., Stingl, C., Post, K. W., Maiwald, J., Bach, N., Pietsch, I., Neubauer, D., Loehle, A., Clauss, C., Jiang, S., Jeevan, H. S., Basov, D. N., Gegenwart, P., Dressel, M. |
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| Rok vydání: | 2014 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.113.227001 |
| Popis: | 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 magneto-elastic coupling of the Eu$^{2+}$ ions. We find that only 0.1T are sufficient for persistent detwinning below the local Eu$^{2+}$ ordering; above $T_\text{Eu}$ = 19K, 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 (190K). This persistent detwinning provides the unique possibility to study the low temperature electronic in-plane anisotropy of iron pnictides without applying any symmetrybreaking external force. Comment: accepted by Physical Review Letters |
| Databáze: | arXiv |
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