Superconducting and normal-state properties of single-crystalline Tl0.47Rb0.34Fe1.63Se2 as seen via Se77 and Rb87 NMR
Long Ma, G. F. Ji, J. Zhang, J. B. He, D. M. Wang, G. F. Chen, Wei Bao, Weiqiang Yu
DOI 10.1103/PhysRevB.83.174510 · 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 report both Se77 and Rb87 nuclear magnetic resonance (NMR) studies on Tl0.47Rb0.34Fe1.63Se2 single-crystalline superconductors (Tc≈ 32 K). Singlet superconductivity is suggested by a sharp drop of the Knight shift K(T) below Tc, after subtracting the superconducting diamagnetic effect. However, the Hebel-Slichter coherence peak below Tc is not observed in the spin-lattice relaxation rate 1/T1, even with a low in-plane NMR field of 2.6 T. Just above Tc, no evidence of low-energy spin fluctuation is found in the spin-lattice relaxation rate on both the Se77 and the Rb87 sites. Upon warming, however, the Knight shifts and the spin-lattice relaxation rates of both nuclei increase substantially with temperature. In particular, the Knight shift is nearly isotropic and follow a function fit of K=a+bT2 from Tc up to 300 K. Our observations should put a strong constraint to the theory of magnetism and superconductivity in the recently discovered iron selenide superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Tl0.47Rb0.34Fe1.63Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | unknown |
| K0.8Fe2-xSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | unknown |
Similar papers
Superconductivity at 32 K in single-crystalline RbxFe2−ySe2
similarity 0.95A. F. Wang et al.
Source status unknown — claims are unverified
Modulated superconductivity due to vacancy and magnetic order in AyFe2−x/2Se2 [A=Cs, K, (Tl,Rb), (Tl,K)] iron-selenide superconductors
similarity 0.95Tanmoy Das & A. V. Balatsky
Source status unknown — claims are unverified
Coexistence of different electronic phases in the K0.8Fe1.6Se2 superconductor: A bulk-sensitive hard x-ray spectroscopy study
similarity 0.95L. Simonelli et al.
Source status unknown — claims are unverified
Superconductivity and normal state properties of single-crystalline Tl0.47Rb0.34Fe1.63Se2 as seen via 77Se and 87Rb NMR
similarity 0.94L. Ma et al. · 2011 · arXiv:1102.3888
Source status unknown — claims are unverified
Superconductivity in the iron selenide KxFe2Se2 (0≤x≤1.0)
similarity 0.94Jiangang Guo et al.
Source status unknown — claims are unverified
Phase Diagram of KxFe2−ySe2−zSz and the Suppression of its Superconducting State by an Fe2−Se/S Tetrahedron Distortion
similarity 0.94Hechang Lei (雷和畅) et al.
Source status unknown — claims are unverified