Persistent detwinning of iron pnictides by small magnetic fields

Abstract

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.

arXiv commentaccepted by Physical Review Letters

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• Disorder-induced time effect in the antiferromagnetic domain state of Fe1+yTe