Persistent detwinning of iron pnictides by small magnetic fields

S. Zapf; C. Stingl; K. W. Post; J. Maiwald; N. Bach; I. Pietsch; D. Neubauer; A. Loehle; C. Clauss; S. Jiang; H. S. Jeevan; D. N. Basov; P. Gegenwart; M. Dressel

doi:10.1103/PhysRevLett.113.227001

Persistent detwinning of iron pnictides by small magnetic fields

Superconductivity 2015-06-22 v1 Strongly Correlated Electrons

Authors: S. Zapf , C. Stingl , K. W. Post , J. Maiwald , N. Bach , I. Pietsch , D. Neubauer , A. Loehle , C. Clauss , S. Jiang , H. S. Jeevan , D. N. Basov , P. Gegenwart , M. Dressel

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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.

Keywords

iron pnictides persistent detwinning magnetic detwinning fields EuFe$_2$As$_2$ magneto-elastic coupling twin domains electronic anisotropy phase transition

Cite

@article{arxiv.1408.6666,
  title  = {Persistent detwinning of iron pnictides by small magnetic fields},
  author = {S. Zapf and C. Stingl and K. W. Post and J. Maiwald and N. Bach and I. Pietsch and D. Neubauer and A. Loehle and C. Clauss and S. Jiang and H. S. Jeevan and D. N. Basov and P. Gegenwart and M. Dressel},
  journal= {arXiv preprint arXiv:1408.6666},
  year   = {2015}
}

Comments

accepted by Physical Review Letters

Persistent detwinning of iron pnictides by small magnetic fields

Abstract

Keywords

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