Abstract
Nematic order, a self-organized state with rotational symmetry broken, has been observed in both copper-oxide and iron-pnictide high temperature superconductors. However, its origin is still a mystery in the iron pnictides although it is considered as a key to understand the mechanism of superconductivity. Here, we report a systemic nuclear magnetic resonance (NMR) study on NaFe1−xCoxAs (0 ≤x ≤ 0.042) that an orbital order, accompanied by an instant spin nematicity, occurs at at a temperature T∗ far above structural transition temperature Ts in the tetragonal phase. We show that the observed NMR spectra splitting and its evolution is due to an incommensurate orbital order that sets in below T∗ and becomes commensurate below Ts. We show that the electric field gradient asymmetry parameter is a good measure for the orbital order parameter which undergoes a Landau-like 2nd-order phase transition. We further show that the spin nematicity is well accounted for by the observed orbital order.
| Original language | English |
|---|---|
| Pages (from-to) | 857-863 |
| Number of pages | 7 |
| Journal | Journal of Superconductivity and Novel Magnetism |
| Volume | 30 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Apr 1 2017 |
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Keywords
- Iron pnictides
- Nematic order
- Nuclear magnetic resonance
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
Cite this
Systemic Study of Orbital and Spin Nematicity in NaFe1−xCoxAs by NMR. / Zhou, Rui; Zheng, Guo-Qing.
In: Journal of Superconductivity and Novel Magnetism, Vol. 30, No. 4, 01.04.2017, p. 857-863.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Systemic Study of Orbital and Spin Nematicity in NaFe1−xCoxAs by NMR
AU - Zhou, Rui
AU - Zheng, Guo-Qing
PY - 2017/4/1
Y1 - 2017/4/1
N2 - Nematic order, a self-organized state with rotational symmetry broken, has been observed in both copper-oxide and iron-pnictide high temperature superconductors. However, its origin is still a mystery in the iron pnictides although it is considered as a key to understand the mechanism of superconductivity. Here, we report a systemic nuclear magnetic resonance (NMR) study on NaFe1−xCoxAs (0 ≤x ≤ 0.042) that an orbital order, accompanied by an instant spin nematicity, occurs at at a temperature T∗ far above structural transition temperature Ts in the tetragonal phase. We show that the observed NMR spectra splitting and its evolution is due to an incommensurate orbital order that sets in below T∗ and becomes commensurate below Ts. We show that the electric field gradient asymmetry parameter is a good measure for the orbital order parameter which undergoes a Landau-like 2nd-order phase transition. We further show that the spin nematicity is well accounted for by the observed orbital order.
AB - Nematic order, a self-organized state with rotational symmetry broken, has been observed in both copper-oxide and iron-pnictide high temperature superconductors. However, its origin is still a mystery in the iron pnictides although it is considered as a key to understand the mechanism of superconductivity. Here, we report a systemic nuclear magnetic resonance (NMR) study on NaFe1−xCoxAs (0 ≤x ≤ 0.042) that an orbital order, accompanied by an instant spin nematicity, occurs at at a temperature T∗ far above structural transition temperature Ts in the tetragonal phase. We show that the observed NMR spectra splitting and its evolution is due to an incommensurate orbital order that sets in below T∗ and becomes commensurate below Ts. We show that the electric field gradient asymmetry parameter is a good measure for the orbital order parameter which undergoes a Landau-like 2nd-order phase transition. We further show that the spin nematicity is well accounted for by the observed orbital order.
KW - Iron pnictides
KW - Nematic order
KW - Nuclear magnetic resonance
UR - http://www.scopus.com/inward/record.url?scp=85013356434&partnerID=8YFLogxK
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U2 - 10.1007/s10948-017-3997-5
DO - 10.1007/s10948-017-3997-5
M3 - Article
AN - SCOPUS:85013356434
VL - 30
SP - 857
EP - 863
JO - Journal of Superconductivity and Novel Magnetism
JF - Journal of Superconductivity and Novel Magnetism
SN - 1557-1939
IS - 4
ER -