# YbSb2 superconductor time-reversal symmetry discovery

> Live situation record from CLSTR: https://clstr.news/situations/ybsb2-superconductor-time-reversal-symmetry-discovery
> Updated: 2026-10-02T12:24:15.000Z. Sources: 4. Developments: 2.

Physicists have identified a unique property in the type-I superconductor ytterbium diantimonide (YbSb2), which spontaneously breaks time-reversal symmetry. Researchers from the Indian Institute of Science Education and Research (IISER) Bhopal synthesized single crystals of the material and observed it entering a superconducting state at approximately 0.95 Kelvin.

Unlike unconventional type-II superconductors, YbSb2 behaves as a type-I superconductor, expelling magnetic fields in its Meissner state and entering an intermediate state at higher magnetic fields. This discovery suggests a new pathway for exploring exotic superconducting states and may influence future quantum computing designs.

## Timeline

### 2026-10-02: Scientific discoveries reveal quantum symmetry breaking and Earth rotation fluctuations

Scientific breakthroughs include the discovery of spontaneous time-reversal symmetry breaking in the superconductor YbSb2 and new insights into how Earth's core-mantle interactions affect day length.

2 sources. https://clstr.news/cluster/scientific-discoveries-reveal-quantum-symmetry-breaking-and-earth-rotation-fluctuations

### 2026-10-02: YbSb2 superconductor discovered to break time-reversal symmetry

Physicists have discovered that the type-I superconductor YbSb2 spontaneously breaks time-reversal symmetry, a rare trait previously associated only with type-II superconductors.

2 sources. https://clstr.news/cluster/ybsb2-superconductor-discovered-to-break-time-reversal-symmetry

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Cite as: YbSb2 superconductor time-reversal symmetry discovery. CLSTR, https://clstr.news/situations/ybsb2-superconductor-time-reversal-symmetry-discovery