Macroscopic physical properties and spin dynamics in the layered superconductor Fe1+δTe1−xSex
Chishiro Michioka, Hiroto Ohta, Mami Matsui, Jinhu Yang, Kazuyoshi Yoshimura, Minghu Fang
DOI 10.1103/PhysRevB.82.064506 · Physical Review B
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Abstract
Macroscopic physical properties of the novel layered superconducting system Fe1+δTe1−xSex were investigated by means of magnetic-susceptibility, electric resistivity, and heat-capacity measurements. In addition to the substitution effect of the Te site, intercalated excess irons would suppress the bulk superconductivity. We have also performed T125e and S77e NMRs on a single crystal of Fe1.04Te0.67Se0.33 with the highest superconducting transition temperature Tc∼14 K. In the superconducting state, the spin part of Knight shifts for both H∥a and H∥c are suppressed, and the nuclear-spin-lattice relaxation rate 1/T1 shows the power-law like behavior without any coherent peaks, indicating the nodal spin-singlet superconductivity. In the normal state, 1/T1T is enhanced by antiferromagnetic spin fluctuations with decreasing temperature. The superconductivity in Fe1+δTe1−xSex is realized in the vicinity of the magnetic quantum phase transition and is possibly mediated by the growth of the antiferromagnetic spin fluctuations.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Fe1.04Te0.67Se0.33 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14 | Pressure not reported | unknown |
| Fe1.08Te0.55Se0.45 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14 | Pressure not reported | unknown |
| Fe1.08Te0.55Se0.45 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14.19 | Pressure not reported | unknown |
| Fe1.12Te0.72Se0.28 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14 | Pressure not reported | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure not reported | unknown |
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