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Temperature dependence of NMR Knight shift in pnictides: proximity to a van Hove singularity
Strongly Correlated Electrons · Submitted 25 Jul 2018
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim The unconventional temperature variation of the Knight shift (static spin susceptibility) that has been observed in Fe-based superconductors AFe$_2$As$_2$ (A = K, Rb, Cs) is explained in terms of proximity to a van Hove singularity.
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The abstract, sentence by sentence
The unconventional temperature variation of the Knight shift (static spin susceptibility) that has been observed in Fe-based superconductors AFe$_2$As$_2$ (A = K, Rb, Cs) is explained in terms of proximity to a van Hove singularity. Using the Hubbard model we show that when the Fermi energy is in the vicinity of a van Hove singularity, a downturn in spin susceptibility occurs as the temperature is lowered. This behavior is characterized by a temperature, $T^*$, which is determined by the difference in energy between the Fermi level and the van Hove singularity. When vertex corrections are taken into account in a dynamical mean-field approximation, the effect of correlations amplifies the relative drop in the Knight shift and moves $T^*$ to lower temperatures.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The unconventional temperature variation of the Knight shift (static spin susceptibility) that has been observed in Fe-based superconductors AFe$_2$As$_2$ (A = K, Rb, Cs) is explained in terms of proximity to a van Hove singularity. | contribution 0.34 | 0.36 | 0.87 | asserted 1.00 |
| s1 | Using the Hubbard model we show that when the Fermi energy is in the vicinity of a van Hove singularity, a downturn in spin susceptibility occurs as the temperature is lowered. | result 0.77 | 0.90 | 0.29 | asserted 1.00 |
| s2 | This behavior is characterized by a temperature, $T^*$, which is determined by the difference in energy between the Fermi level and the van Hove singularity. | result 0.78 | 0.64 | 0.15 | asserted 1.00 |
| s3 | When vertex corrections are taken into account in a dynamical mean-field approximation, the effect of correlations amplifies the relative drop in the Knight shift and moves $T^*$ to lower temperatures. | result 0.95 | 0.85 | 0.14 | asserted 1.00 |
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The paper
Original abstract
The unconventional temperature variation of the Knight shift (static spin susceptibility) that has been observed in Fe-based superconductors AFe$_2$As$_2$ (A = K, Rb, Cs) is explained in terms of proximity to a van Hove singularity. Using the Hubbard model we show that when the Fermi energy is in the vicinity of a van Hove singularity, a downturn in spin susceptibility occurs as the temperature is lowered. This behavior is characterized by a temperature, $T^*$, which is determined by the difference in energy between the Fermi level and the van Hove singularity. When vertex corrections are taken into account in a dynamical mean-field approximation, the effect of correlations amplifies the relative drop in the Knight shift and moves $T^*$ to lower temperatures.
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This effect seems to be captured by very recent calculations of the spin susceptibility for a one-band Hubbard model near half-filling [ref] .
Van Hove singularities, chemical pressure and phonons: an angle-resolved photoemission study of KFe$_2$As$_2$ and CsFe$_2$As$_2$ · Effect of thermal broadening on the electronic properties · 0.98
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This part of the irreducible vertex function, $[ Γ^m, irr_loc(ν_n)]_ω_mω_m'$, can be calculated in the framework of the DMFT approximation from four point correlation functions on the self-consistent impurity [ref] .
Charge-fluctuations in lightly hole-doped cuprates: effect of vertex corrections · Introduction · 0.91
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