Decoupling of lattice and orbital degrees of freedom in an iron-pnictide superconductor
C. E. Matt, O. Ivashko, M. Horio, J. Choi, Q. Wang, D. Sutter, N. Dennler, M. H. Fischer, S. Katrych, L. Forro, J. Ma, B. Fu, B. Q. Lv, M. v. Zimmermann, T. K. Kim, N. C. Plumb, N. Xu, M. Shi, J. Chang
DOI 10.1103/PhysRevResearch.3.023220 · Physical Review Research
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
The interplay between structural and electronic phases in iron-based superconductors is a central theme in the search for the superconducting pairing mechanism. While electronic nematicity is competing with superconductivity, the effect of purely structural orthorhombic order is unexplored. Here, using x-ray diffraction and angle-resolved photoemission spectroscopy, we reveal a structural orthorhombic phase in the electron-doped iron-pnictide superconductor Pr4Fe2As2Te0.88O4 (Tc=25 K), which is distinct from orthorhombicity in the nematic phase in underdoped pnictides. Despite the high electron doping we find an exceptionally high orthorhombic onset temperature (Tort∼250 K), no signatures of phase competition with superconductivity, and absence of electronic nematic order as the driving mechanism for orthorhombicity. Combined, our results establish a high-temperature phase in the phase diagram of iron-pnictide superconductors and impose strong constraints for the modeling of their superconducting pairing mechanism.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pr4Fe2As2Te0.88O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | onset |
| Pr4Fe2As2Te0.88O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | onset |
| Ba(Fe1-xCox)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | unknown |
Similar papers
Unconventional pairing in the iron arsenide superconductors
similarity 0.96Rafael M. Fernandes et al.
Source status unknown — claims are unverified
Competing Magnetic Fluctuations in Iron Pnictide Superconductors: Role of Ferromagnetic Spin Correlations Revealed by NMR
similarity 0.96P. Wiecki et al.
Source status unknown — claims are unverified
Magnetotransport studies of superconducting Pr4Fe2As2Te1−xO4
similarity 0.96A. Pisoni et al.
Source status unknown — claims are unverified
Electron-doping evolution of the low-energy spin excitations in the iron arsenide superconductor BaFe2−xNixAs2
similarity 0.96Miaoyin Wang et al.
Source status unknown — claims are unverified
Electronic structure of the BaFe2As2 family of iron-pnictide superconductors
similarity 0.96M. Yi et al.
Source status unknown — claims are unverified
Normal-state spin dynamics in the iron-pnictide superconductors BaFe2(As1−xPx)2 and Ba(Fe1−xCox)2As2 probed with NMR measurements
similarity 0.96Y. Nakai et al.
Source status unknown — claims are unverified