A75s NMR study of single crystals of the heavily overdoped pnictide superconductors Ba1−xKxFe2As2 (x=0.7 and 1)
S. W. Zhang, L. Ma, Y. D. Hou, J. Zhang, T.-L. Xia, G. F. Chen, J. P. Hu, G. M. Luke, W. Yu
DOI 10.1103/PhysRevB.81.012503 · Physical Review B
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
We performed A75s NMR studies on two overdoped high-quality Ba1−xKxFe2As2 (x=0.7 and 1.0) single crystals. In the normal states, we found a dramatic increase in the spin-lattice relaxation (1/T751) from the x=0.7 to the x=1.0 samples. In KFe2As2, the ratio of 1/T751TKn2, where K75n is the Knight shift, increases as temperature drops. These results indicate the existence of another type of spin fluctuations in KFe2As2 which is accustomed to being treated as a simple Fermi liquid. In the superconducting state, the temperature scalings of 1/T751 below Tc in the overdoped samples are significantly different from those in the under or optimally doped ones. A power-law scaling behavior 1/T751T∼T0.5 is observed, which indicates universal strong low-energy excitations in the overdoped hole-type superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba0.3K0.7Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 19 | Pressure not reported | onset |
| Ba0.3K0.7Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16 | Pressure not reported | onset |
| KFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure not reported | unknown |
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
| Ba0.6K0.4Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Theory of mixed-state effect on NMR relaxation measurements in iron pnictide superconductors
similarity 0.96Yi Gao et al.
Source status unknown — claims are unverified
Anisotropic superconducting properties of optimally doped BaFe2(As0.65P0.35)2 under pressure
similarity 0.95Swee K. Goh et al.
Source status unknown — claims are unverified
Lattice dynamics of Ti-based pnictide superconductors Ba1−xNaxTi2Sb2O
similarity 0.95A. P. Litvinchuk et al.
Source status unknown — claims are unverified
Band Structure and Fermi Surface of an Extremely Overdoped Iron-Based Superconductor KFe2As2
similarity 0.95T. Sato et al.
Source status unknown — claims are unverified
Selective Mott Physics as a Key to Iron Superconductors
similarity 0.95Luca de’ Medici et al.
Source status unknown — claims are unverified
Electronic Dispersion Anomalies in Iron Pnictide Superconductors
similarity 0.95Andreas Heimes et al.
Source status unknown — claims are unverified