Persistent detwinning of iron pnictides by small magnetic fields
Abstract
Our comprehensive study on EuFe2As2 reveals a dramatic reduction of magnetic detwinning fields compared to other AFe2As2 (A = Ba, Sr, Ca) iron pnictides by indirect magneto-elastic coupling of the Eu2+ ions. We find that only 0.1T are sufficient for persistent detwinning below the local Eu2+ ordering; above TEu = 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.
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