Orbital order and spin nematicity in the tetragonal phase of the electron-doped iron pnictides NaFe1-xCoxAs

R. Zhou, L. Y. Xing, X. C. Wang, C. Q. Jin, Guo-Qing Zheng

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

In copper-oxide and iron-based high-temperature (high-Tc) superconductors, many physical properties exhibit in-plane anisotropy, which is believed to be caused by a rotational symmetry-breaking nematic order, whose origin and its relationship to superconductivity remain elusive. In many iron pnictides, a tetragonal-to-orthorhombic structural transition temperature Ts coincides with the magnetic transition temperature TN, making the orbital and spin degrees of freedom highly entangled. NaFeAs is a system where Ts=54 K is well separated from TN=42 K, which helps simplify the experimental situation. Here we report nuclear magnetic resonance (NMR) measurements on NaFe1-xCoxAs (0≤x≤0.042) that revealed orbital and spin nematicity occurring at a temperature T∗ far above Ts in the tetragonal phase. We show that the NMR spectra splitting and its evolution can be explained by an incommensurate orbital order that sets in below T∗ and becomes commensurate below Ts, which brings about the observed spin nematicity.

Original languageEnglish
Article number060502
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume93
Issue number6
DOIs
Publication statusPublished - Feb 1 2016

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Group 5A compounds
Superconducting transition temperature
Iron
Nuclear magnetic resonance
Magnetic resonance measurement
iron
orbitals
Copper oxides
High temperature superconductors
Electrons
Superconductivity
transition temperature
nuclear magnetic resonance
Anisotropy
electrons
Physical properties
copper oxides
broken symmetry
superconductivity
degrees of freedom

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Orbital order and spin nematicity in the tetragonal phase of the electron-doped iron pnictides NaFe1-xCoxAs. / Zhou, R.; Xing, L. Y.; Wang, X. C.; Jin, C. Q.; Zheng, Guo-Qing.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 93, No. 6, 060502, 01.02.2016.

Research output: Contribution to journalArticle

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