Broken mirror symmetry, incommensurate spin correlations, and B2g nematic order in iron pnictides
- Renmin Univ. of China, Beijing (China)
- Rice Univ., Houston, TX (United States)
Motivated by recent experiments in the extremely hole doped iron pnictide compounds AFe2As2 (A = K, Rb, Cs), we consider spin-driven nematic order for incommensurate magnetic fluctuations. We classify the nematic order parameters by broken mirror symmetries of the tetragonal D4h point group, and use this scheme to construct a general Ginzburg-Landau theory that links the nematic order to spatial pattern of magnetic fluctuations. Our analysis points to incommensurate (q,q) magnetic fluctuations as underlying a B2g nematic order in AFe2As2. We substantiate this idea by microscopic calculations based on three-sublattice (2π/3,2π/3) spin correlations in an extended bilinear-biquadratic Heisenberg model. Our classification scheme provides symmetry-based understanding for quasidegeneracy of several nematic channels. The proposed mechanism resolves recently emerged experimental puzzles. Furthermore, we suggest ways to further test it in future experiments and discuss the implications of our results for iron-based high temperature superconductivity.
- Research Organization:
- Rice Univ., Houston, TX (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- SC0018197
- OSTI ID:
- 1612873
- Alternate ID(s):
- OSTI ID: 1562166
- Journal Information:
- Physical Review B, Vol. 100, Issue 10; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Novel electronic nematicity in heavily hole-doped iron pnictide superconductors
|
journal | March 2020 |
Density matrix renormalization group study of nematicity in two dimensions: Application to a spin-1 bilinear-biquadratic model on the square lattice
|
journal | January 2020 |
Density Matrix Renormalization Group Study of Nematicity in Two Dimensions: Application to a Spin-$1$ Bilinear-Biquadratic Model on the Square Lattice | text | January 2020 |
Similar Records
Nematic fluctuations in iron-oxychalcogenide Mott insulators
Nematic spin liquid phase in a frustrated spin-1 system on the square lattice