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Two Room-Temperature Antiferromagnetic Semiconductor Candidates
Hraness wrote this summary from a saved copy of the source. Quotations are taken word for word from the source.
gist
Geby Jaff reports two Luttinger-compensated magnets for spintronics found with Claude agents, one a 1999 compound ordered to 376 K. Designed YBaMnFeO₅ may scramble in synthesis; KV[Cr(CN)₆] already exists. Hybrid DFT predicts zero net moment with large spin windows. Calculations are public; spin sorting remains unmeasured.
ideas
- Luttinger-compensated magnets cancel net moment while still sorting spin by energy. Unlike ordinary antiferromagnets, inequivalent up and down sites keep a usable spin window at the band edges.
- YBaMnFeO₅ is a designed candidate that may be hard to make. Agents predict a large band gap and spin windows, but the Mn/Fe checkerboard disorders near synthesis temperatures.
- KV[Cr(CN)₆] was hiding in plain sight since 1999. Its chemists cancelled the metals' moments; later plots showed same-spin band edges without naming the spintronic opportunity.
- Simulation caveats remain. Perfect-crystal predictions differ from the hydrated 1999 powder, HSE06 and PBE+U disagree on water's effect, and spin sorting is still unmeasured.
- Open artifacts invite independent checks. Input files, raw outputs, analysis code, a one-command checker, and known caveats are on GitHub.
quotes
“Today, I’ll share what we found.”
“A scrambled crystal loses the spin sorting, so this design may be hard to make in its useful form.”
“This suggests that materials for the next step in spintronics may already exist, waiting to be recognized.”