Persistent Detwinning of Iron-Pnictide EuFe2As2 Crystals by Small External Magnetic Fields
S. Zapf, C. Stingl, K. W. Post, J. Maiwald, N. Bach, I. Pietsch, D. Neubauer, A. Löhle, C. Clauss, S. Jiang, H. S. Jeevan, D. N. Basov, P. Gegenwart, M. Dressel
DOI 10.1103/PhysRevLett.113.227001 · Physical Review Letters
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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 magnetoelastic coupling of the Eu2+ ions. We find that only ∼0.1 T are sufficient for persistent detwinning below the local Eu2+ ordering; above TEu=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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| EuFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
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