Abstract
We report on the pairing symmetry and the spin correlations in the Fe(Ni)-based superconductors RFe(Ni)AsO1-xFx (R=Pr, La), LiFeAs and Ba1-xKxFe2As2 single crystals, based on our extensive nuclear magnetic resonance and nuclear quadrupole resonance measurements. The spin susceptibility measured by the Knight shift decreases below Tc along all crystal directions, which indicates spin-singlet pairing. Evidence for multiple gaps is given. We find that the antiferromagnetic spin fluctuation is anisotropic in the spin space due to spin-orbit coupling, but becomes isotropic in the zero temperature limit, which points to spin-singlet superconductivity with nodeless gap.
| Original language | English |
|---|---|
| Article number | 022145 |
| Journal | Journal of Physics: Conference Series |
| Volume | 400 |
| Issue number | PART 2 |
| DOIs | |
| Publication status | Published - 2012 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
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Spin-orbit coupling, anisotropic magnetic fluctuations and nodeless energy gap in iron-pnictides revealed by NMR. / Li, Z.; Yang, J.; Zheng, Guo-Qing.
In: Journal of Physics: Conference Series, Vol. 400, No. PART 2, 022145, 2012.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Spin-orbit coupling, anisotropic magnetic fluctuations and nodeless energy gap in iron-pnictides revealed by NMR
AU - Li, Z.
AU - Yang, J.
AU - Zheng, Guo-Qing
PY - 2012
Y1 - 2012
N2 - We report on the pairing symmetry and the spin correlations in the Fe(Ni)-based superconductors RFe(Ni)AsO1-xFx (R=Pr, La), LiFeAs and Ba1-xKxFe2As2 single crystals, based on our extensive nuclear magnetic resonance and nuclear quadrupole resonance measurements. The spin susceptibility measured by the Knight shift decreases below Tc along all crystal directions, which indicates spin-singlet pairing. Evidence for multiple gaps is given. We find that the antiferromagnetic spin fluctuation is anisotropic in the spin space due to spin-orbit coupling, but becomes isotropic in the zero temperature limit, which points to spin-singlet superconductivity with nodeless gap.
AB - We report on the pairing symmetry and the spin correlations in the Fe(Ni)-based superconductors RFe(Ni)AsO1-xFx (R=Pr, La), LiFeAs and Ba1-xKxFe2As2 single crystals, based on our extensive nuclear magnetic resonance and nuclear quadrupole resonance measurements. The spin susceptibility measured by the Knight shift decreases below Tc along all crystal directions, which indicates spin-singlet pairing. Evidence for multiple gaps is given. We find that the antiferromagnetic spin fluctuation is anisotropic in the spin space due to spin-orbit coupling, but becomes isotropic in the zero temperature limit, which points to spin-singlet superconductivity with nodeless gap.
UR - http://www.scopus.com/inward/record.url?scp=84873676470&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84873676470&partnerID=8YFLogxK
U2 - 10.1088/1742-6596/400/2/022145
DO - 10.1088/1742-6596/400/2/022145
M3 - Article
AN - SCOPUS:84873676470
VL - 400
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
IS - PART 2
M1 - 022145
ER -