Singular magnetic anisotropy in the nematic phase of FeSe
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Standard
Singular magnetic anisotropy in the nematic phase of FeSe. / Zhou, Rui; Scherer, Daniel D.; Mayaffre, Hadrien; Toulemonde, Pierre; Ma, Mingwei; Li, Yuan; Andersen, Brian M.; Julien, Marc-Henri.
I: npj Quantum Materials, Bind 5, Nr. 1, 93, 14.12.2020.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - Singular magnetic anisotropy in the nematic phase of FeSe
AU - Zhou, Rui
AU - Scherer, Daniel D.
AU - Mayaffre, Hadrien
AU - Toulemonde, Pierre
AU - Ma, Mingwei
AU - Li, Yuan
AU - Andersen, Brian M.
AU - Julien, Marc-Henri
PY - 2020/12/14
Y1 - 2020/12/14
N2 - FeSe is arguably the simplest, yet the most enigmatic, iron-based superconductor. Its nematic but non-magnetic ground state is unprecedented in this class of materials and stands out as a current puzzle. Here, our nuclear magnetic resonance measurements in the nematic state of mechanically detwinned FeSe reveal that both the Knight-shift and the spin-lattice relaxation rate 1/T-1 possess an in-plane anisotropy opposite to that of the iron pnictides LaFeAsO and BaFe2As2. Using a microscopic electron model that includes spin-orbit coupling, our calculations show that an opposite quasiparticle weight ratio between the d(xz) and d(yz) orbitals leads to an opposite anisotropy of the orbital magnetic susceptibility, which explains our Knight-shift results. We attribute this property to a different nature of nematic order in the two compounds, predominantly bond type in FeSe and onsite ferro-orbital in pnictides. The T-1 anisotropy is found to be inconsistent with existing neutron scattering data in FeSe, showing that the spin fluctuation spectrum reveals surprises at low energy, possibly from fluctuations that do not break C-4 symmetry. Therefore, our results reveal that important information is hidden in these anisotropies and they place stringent constraints on the low-energy spin correlations as well as on the nature of nematicity in FeSe.
AB - FeSe is arguably the simplest, yet the most enigmatic, iron-based superconductor. Its nematic but non-magnetic ground state is unprecedented in this class of materials and stands out as a current puzzle. Here, our nuclear magnetic resonance measurements in the nematic state of mechanically detwinned FeSe reveal that both the Knight-shift and the spin-lattice relaxation rate 1/T-1 possess an in-plane anisotropy opposite to that of the iron pnictides LaFeAsO and BaFe2As2. Using a microscopic electron model that includes spin-orbit coupling, our calculations show that an opposite quasiparticle weight ratio between the d(xz) and d(yz) orbitals leads to an opposite anisotropy of the orbital magnetic susceptibility, which explains our Knight-shift results. We attribute this property to a different nature of nematic order in the two compounds, predominantly bond type in FeSe and onsite ferro-orbital in pnictides. The T-1 anisotropy is found to be inconsistent with existing neutron scattering data in FeSe, showing that the spin fluctuation spectrum reveals surprises at low energy, possibly from fluctuations that do not break C-4 symmetry. Therefore, our results reveal that important information is hidden in these anisotropies and they place stringent constraints on the low-energy spin correlations as well as on the nature of nematicity in FeSe.
KW - SUPERCONDUCTIVITY
KW - ORDER
KW - FRUSTRATION
KW - MATTER
U2 - 10.1038/s41535-020-00295-1
DO - 10.1038/s41535-020-00295-1
M3 - Journal article
VL - 5
JO - npj Quantum Materials
JF - npj Quantum Materials
SN - 2397-4648
IS - 1
M1 - 93
ER -
ID: 254461579