Magnetic surface reconstruction in the van der Waals antiferromagnet Fe1+xTe
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TRAINER, Christopher, SONGVILAY, M., QURESHI, Navid, STUNAULT, Anne , YIM, Chi Ming, RODRIGUEZ, Eduardo E., HEIL, Christoph, TSURKAN, Vladimir, GREEN, M. A., LOIDL, Alois, WAHL, Peter, STOCK, Christopher. Magnetic surface reconstruction in the van der Waals antiferromagnet Fe1+xTe. In: Physical Review B, 2021, vol. 103, p. 0. ISSN 2469-9950. DOI: https://doi.org/10.1103/PhysRevB.103.024406
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Physical Review B
Volumul 103 / 2021 / ISSN 2469-9950 /ISSNe 2469-9969

Magnetic surface reconstruction in the van der Waals antiferromagnet Fe1+xTe

DOI: https://doi.org/10.1103/PhysRevB.103.024406

Pag. 0-0

Trainer Christopher1, Songvilay M.2, Qureshi Navid3, Stunault Anne 3, Yim Chi Ming1, Rodriguez Eduardo E.4, Heil Christoph5, Tsurkan Vladimir67, Green M. A.8, Loidl Alois7, Wahl Peter1, Stock Christopher2
 
1 University of St Andrews,
2 University of Edinburgh,
3 Institut Laue-Langevin, Grenoble,
4 University of Maryland,
5 Graz University of Technology,
6 Institute of Applied Physics,
7 University of Augsburg,
8 University of Kent at Canterbury
 
Disponibil în IBN: 25 ianuarie 2021


Rezumat

Fe1+xTe is a two-dimensional van der Waals antiferromagnet that becomes superconducting on anion substitution on the Te site. The properties of the parent phase of Fe1+xTe are sensitive to the amount of interstitial iron situated between the iron-tellurium layers. Fe1+xTe displays collinear magnetic order coexisting with low-temperature metallic resistivity for small concentrations of interstitial iron x and helical magnetic order for large values of x. While this phase diagram has been established through scattering [see, for example, E. E. Rodriguez, Phys. Rev. B 84, 064403 (2011)10.1103/PhysRevB.84.064403; S. Rößler, Phys. Rev. B 84, 174506 (2011)10.1103/PhysRevB.84.174506], recent scanning tunneling microscopy measurements [C. Trainer, Sci. Adv. 5, eaav3478 (2019)10.1126/sciadv.aav3478] have observed a different magnetic structure for small interstitial iron concentrations x with a significant canting of the magnetic moments along the crystallographic c axis of θ=28∘±3∘. In this paper, we revisit the magnetic structure of Fe1.09Te using spherical neutron polarimetry and scanning tunneling microscopy to search for this canting in the bulk phase, and we compare surface and bulk magnetism. The results show that the bulk magnetic structure of Fe1.09Te is consistent with collinear in-plane order (θ=0 with an error of ∼5∘). Comparison with scanning tunneling microscopy on a series of Fe1+xTe samples reveals that the surface exhibits a magnetic surface reconstruction with a canting angle of the spins of θ=29.8∘. We suggest that this is a consequence of structural relaxation of the surface layer resulting in an out-of-plane magnetocrystalline anisotropy. The magnetism in Fe1+xTe displays different properties at the surface when the symmetry constraints of the bulk are removed.

Cuvinte-cheie
Antiferromagnetic materials, crystallography, iron, Iron compounds, Magnetic moments, Magnetic structure, Magnetocrystalline anisotropy, Scanning tunneling microscopy, Surface reconstruction, temperature, Van der, Waals forces