From 12,800 candidates to a patent-pending superconductor family in under 24 hours.

The challenge

High-temperature superconductors have transformative potential for energy transmission, medical imaging, quantum computing, and transportation. But the best-known cuprate superconductors — YBCO at 92 K and the mercury-barium family at 133 K — were discovered decades ago. Finding new compositions that push beyond these benchmarks while remaining practical to manufacture has been an open problem in materials science.

The traditional approach involves intuition-guided synthesis, months of DFT calculations, and trial-and-error laboratory work. Most candidate compositions never make it to the lab because there is no fast way to screen for phase stability, economics, manufacturability, and superconducting potential simultaneously. And even when a promising composition is identified, translating it into a disciplined experimental program — with proper controls, oxygen-history tuning, and repeatability gates — typically requires deep domain expertise and months of additional planning.

The FluxMateria pipeline

The discovery used FluxMateria’s materials inverse-design engine: a five-stage funnel that generates, screens, refines, validates, and packages candidates for laboratory synthesis. Every stage runs on physics-based models — no machine learning, no database lookups.

Discovery funnel

The pipeline progressively narrowed the search space through five stages, from broad generation to experiment-ready leads.

The disclosed composition family

The pipeline converged on a novel tungsten-modified calcium-barium-copper oxide family with the general formula WCaBaCu₃O_xM (x ≈ 6–7, M = Mo or Nb). The fluorine-free molybdenum branch emerged as the strongest.

All T_c values are computational predictions from the FluxMateria screening engine, not experimental measurements. Listed formulas are nominal target compositions.

Structural interpretation

The primary lead WCaBaCu₃O₇Mo is interpreted as a layered cuprate oxide with the following provisional cation-site hypothesis:

The working hypothesis is that W, Mo, and Nb occupy charge-reservoir or block-layer sites rather than the CuO₂ planes. Oxygen content (O₆ vs O₇) controls carrier doping — the same mechanism that tunes T_c in YBCO. These are provisional structural hypotheses and chemically motivated working heuristics; exact site assignments and crystallographic identities remain to be established by diffraction and spectroscopy.

Three-dimensional interrogation

What makes this discovery framework distinctive is that it interrogates the candidate basin along three independent axes simultaneously, rather than treating composition alone as the discovery variable:

In cuprate-like oxide systems, superconducting behavior is rarely governed by nominal composition alone. Oxygen stoichiometry, oxygen ordering, local strain, thermal history, and metastability can all affect the superconducting state. This three-axis approach is designed to disentangle these variables rather than conflating them.

Performance in context

Predicted T_c of the primary lead compared to known ambient-pressure cuprate superconductors:

Grey bars = experimentally measured. Purple bar = FluxMateria computational prediction. All materials operate above liquid nitrogen temperature at ambient pressure.

Synthesis approach

The pipeline delivered a complete synthesis plan using conventional ceramic solid-state processing — no exotic equipment required. The precursor system uses inexpensive, commercially available oxide and carbonate powders.

Oxygen-anneal matrix

Carrier concentration is controlled through three oxygen-anneal protocols, analogous to the O₆–O₇ tuning in YBCO:

First-batch experimental matrix

The pipeline produced a 9-pellet DOE matrix covering 3 compositions × 3 oxygen protocols:

Priority: run the three OX-Opt samples first. Expand the winner to Rich/Lean variants before broadening the campaign.

Why this matters

Multi-criteria screening

Every candidate was evaluated against six simultaneous criteria. The pipeline does not optimize for T_c alone — it finds materials that are practical to make, affordable, and novel.

Honest assessment

FluxMateria is a screening and prioritization tool. We are transparent about what is established and what remains to be confirmed.

Validation standard

Consistent with the methodology described in our forthcoming journal submission, no superconductivity claim will be treated as credible unless all four of the following conditions are met:

1. Transport onset — a reproducible superconducting-like onset in four-probe R(T) above the predefined threshold of interest
2. Magnetic corroboration — diamagnetic screening signal consistent with bulk superconductivity (SQUID magnetometry or AC susceptibility)
3. No gross segregation — absence of W/Mo/Nb-rich impurity phases sufficient to trivialize the transport interpretation (XRD + SEM/EDS)
4. Independent remake — repeatability from an independently remixed fresh precursor batch, not just duplicate pellets from one homogenization

This repeatability-gated standard was defined in advance to prevent premature interpretation of single-batch anomalies. The framework has value even in the case of negative results: a structured negative outcome sharpens the boundaries of chemically promising search space and identifies whether oxygen history or pressure history contribute meaningfully within this family.

All T_c values reported in this case study are computational screening estimates from the FluxMateria engine, not experimental measurements. The listed formulas are nominal target compositions emerging from computational ranking; actual synthesized phases, crystallographic identities, exact oxygen counts, and cation site occupancies remain to be established experimentally.

Timeline

Publication and intellectual property

The disclosed compositions (WCaBaCu₃O₇Mo, WCaBaCu₃O₆Mo, WCaBaCu₃O₆Nb, WCaBaCu₃O₇Nb) are published here to establish prior art. Researchers interested in synthesizing or studying these materials are encouraged to contact us regarding collaboration opportunities.