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This study identifies crystal lattice defects as the primary driver of superconductivity in iron selenide, challenging standard models that attribute such behavior solely to electron count. By utilizing direct surface doping via alkali deposition, researchers successfully isolated these structural variables without the confounding effects of synthesizing entirely new bulk materials. The findings offer a refined methodological pathway for tuning high-temperature superconductors, potentially accelerating progress in quantum material engineering.

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A&S reports Shen’s lab finds disorder keys iron selenide tuning

Quantum ZeitgeistSeptember 18, 20264 min read

Researchers at Kyle Shen’s lab discovered iron selenide’s superconductivity is linked to crystal imperfections, not electron count.

Researchers in Kyle Shen’s lab have determined that imperfections within a material’s structure, not electron count, govern superconductivity in iron selenide, a finding that challenges conventional understanding of high-temperature superconductors. Using a novel technique combining synthesis with electrical and spectroscopic probes, the team discovered iron selenide’s superconducting behavior is linked to resistance caused by defects in its crystal lattice. “We found that in this material, that dome is driven by factors much different…

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