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Related Experiment Video

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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

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Search for ambient superconductivity in the Lu-N-H system.

Pedro P Ferreira^1,2, Lewis J Conway^3,4, Alessio Cucciari^5,6

¹Universidade de São Paulo, Escola de Engenharia de Lorena, DEMAR, 12612-550, Lorena, Brazil.

Nature Communications

|September 4, 2023

Summary

This study investigated lutetium hydride for room-temperature superconductivity. Researchers found no evidence supporting superconductivity at room temperature in this material system.

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Area of Science:

Condensed Matter Physics
Materials Science
Quantum Chemistry

Background:

Recent claims of room-temperature superconductivity in N-doped lutetium hydride have spurred significant research interest.
Understanding the phase diagram and potential superconducting properties of such hydrides is crucial for advancing materials science.

Purpose of the Study:

To comprehensively investigate the phase diagram of the Lu-N-H system.
To identify and evaluate potential superconducting phases within this system.
To assess the viability of conventional superconductivity mechanisms in explaining reported phenomena.

Main Methods:

Utilized ab initio crystal structure prediction combined with data-derived interatomic potentials.
Sampled over 200,000 unique structures.
Computed superconducting properties using Density Functional Perturbation Theory for 52 metastable candidates.

Main Results:

Identified 52 metastable Lu-N-H structures within 50 meV of the convex hull.
Predicted finite superconducting critical temperatures (T_c) for some structures.
None of the predicted T_c values approach room-temperature superconductivity.

Conclusions:

The comprehensive study of the Lu-N-H phase diagram did not yield evidence for room-temperature superconductivity.
Conventional superconductivity mechanisms cannot explain the high T_c values previously reported for this material.
This work contributes to the ongoing scientific effort to understand and verify claims of high-temperature superconductivity.