Field-ion imaging of nano-objects at far-subangstrom resolution

Sadanov, E. V.; Mazilova, T. I.; Mikhaĭlovskij, I. M.; Ksenofontov, V. A.; Mazilov, A. A.

doi:10.1103/physrevb.84.035429

Cited by 5 publications

(1 citation statement)

References 27 publications

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“…Shortly after the discovery of superconductivity, it is found that the superconducting volume fraction in the A x Fe 2−y Se 2 superconductors is very small and an intrinsic percolative superconductivity model is proposed [4]. Later on, it has been experimentally proven that the A x Fe 2−y Se 2 system is a phase-separated system which contains a magnetic insulating phase with the well-defined √ 5 × √ 5 order of Fe-site vacancies and a superconducting A x Fe 2 Se 2 phase containing no Fe vacancies [5][6][7][8][9].…”

Section: Copyright C Epla 2012mentioning

confidence: 99%

Phase separation and metallic conductivity in Tl _0.4 K _0.4 Fe _2−y Se _2−x S _x

Feng¹,

Zuo²,

Tan³

et al. 2012

EPL

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We study the effects of S-doping on the microstructure, magnetic and transport properties of the Tl0.4K0.4Fe2−ySe2−xSx superconductor. At low doping level (x ⩽ 0.8), the samples exhibit behaviors similar to those of the parent sample, i.e., the occurrence of phase separation into a Fe-vacancy phase, a charge ordering phase and an undistorted phase; the presence of a “hump”-like feature in the resistivity curves; and the development of antiferromagnetic order well above room temperature. In sharp contrast, the samples with x ⩾ 1.0 all exhibit metallic-like behavior without displaying superconductivity. And these samples are chemically phase separated into a S-poor Tl0.4K0.4Fe2−ySe2−xSx-phase and a S-rich Tl0.4K0.4Fe2−yS2-phase. Interestingly, the Fe-vacancy phase is absent in these samples, accompanied with the disappearance of semiconducting-like conductivity at high temperature and the depression of superconductivity. The charge ordering phase is responsible for the metallic behavior in heavily doped samples.

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