Jan 15, 2015 · The nature of the tetragonal-to-orthorhombic structural transition at T s ≈ 90 K in single crystalline FeSe is studied using shear-modulus, heat-capacity, magnetization, and nuclear magnetic resonance measurements.

Jun 22, 2023 · FeSe displays a nematic transition at Ts = 90 K, which results in a small lattice orthorhombicity and a large anisotropy in both orbital occupation and spin fluctuations, as demonstrated by...

FeSe crystallizes in the orthorhombic Cmme space group. The structure is one-dimensional and consists of two FeSe ribbons oriented in the (0, 1, 0) direction. Fe2+ is bonded in a distorted linear geometry to two equivalent Se2- atoms.

Oct 19, 2023 · FeSe 1−x S x remains one of the most enigmatic systems of Fe-based superconductors. While much is known about the orthorhombic parent compound, FeSe, the tetragonal samples, FeSe 1−x S x with x >...

Apr 22, 2022 · FeSe undergoes a transition from a tetragonal to a slightly orthorhombic phase at 90 K and becomes a superconductor below 8 K. The orthorhombic phase is sometimes called a nematic phase because quantum oscillation, neutron, and other measurements detect a significant asymmetry in $x$ and $y$.

Nov 10, 2016 · Here we utilized angle-resolved photoemission spectroscopy and density functional theory calculations to study the influence of the nematic order on the electronic structure of FeSe and determine...

Enabled by an angle-resolved photoemission spectroscopy beamline with a highly focused beam spot (nano-ARPES), we identify clear stripelike orthorhombic domains in FeSe with a length scale of approximately 1–5 μm.

Feb 9, 2022 · We study the crystal structure of the tetragonal iron selenide FeSe and its nematic phase transition to the low-temperature orthorhombic structure using synchrotron x-ray and neutron scattering analyzed in both real space and reciprocal space.

Jan 16, 2015 · The nature of the tetragonal-to-orthorhombic structural transition at T_{s}≈90 K in single crystalline FeSe is studied using shear-modulus, heat-capacity, magnetization, and nuclear magnetic resonance measurements.

FeSe is Modderite-like structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Fe2+ is bonded to six equivalent Se2- atoms to form a mixture of distorted corner, edge, and face-sharing FeSe6 octahedra.