Materials

Emergence of Double-Dome Superconductivity in the Pressurized Dirac Semimetal BaMg2Bi2

Qi Wang, Juefei Wu, Cuiying Pei, Yi Zhao, Yiyan Wang, Yanpeng Qi

Featured August 10, 2026

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Simply

Applying high pressure to the Dirac semimetal BaMg $_{2}$ Bi $_{2}$ reveals two distinct peaks in its superconducting temperature, with the first linked to changes in electron behavior and the second to a complete shift in its crystal structure.

In depth

The paper reveals a double-dome superconductivity in the Dirac semimetal BaMg

_{2}

_{2}

under high pressure, where the superconducting transition temperature (

T_{c}

) exhibits two distinct peaks. The first peak is attributed to a Lifshitz transition, a change in the material's electronic band structure, while the second peak is driven by a fundamental structural phase transition of the crystal lattice.

Key Takeaways

1
The Dirac semimetal BaMg $_{2}$ Bi $_{2}$ exhibits a pressure-induced double-dome superconductivity, with $T_{c}$ reaching 6.67 K and 7.22 K at different pressure points.
2
The first superconducting dome is linked to a Lifshitz transition, involving changes in the Fermi surface topology and carrier type without structural change.
3
The second superconducting dome is associated with a structural phase transition from the $P \overset{ˉ}{3} m 1$ to the $P nma$ crystal phase.

Conceptual Flow

HIGH LEVEL

Methodology: How was it done?

Researchers squeezed a special material and watched how its ability to conduct electricity without resistance changed, along with its internal structure and electron movement.

Material Sample

Apply Pressure

Measure Properties

Superconducting Behavior

Structure Changes

Electron Flow

Results: What did they find?

Pushing on the material made it superconduct better at two different pressure levels, showing two distinct peaks in its superconducting ability.

Pressure Level

Causes Two Peaks

Superconducting Strength