Exotic Quantum States: Evidence of a Spin-Liquid in Pressurized Oxygen

Spin-liquid state in pressurized oxygen

While oxygen is one of the most familiar elements to humankind, recent research has revealed that under extreme pressures, this seemingly ordinary gas may host exotic quantum states of matter. A collaboration between the Shanghai Advanced Research in Physical Sciences (SHARPS), the Center for High Pressure Science and Technology Advanced Research in China, the Italian National Institute of Optics (CNR-INO), the European Synchrotron Radiation Facility, and University Montpellier has provided the first indirect evidence of a spin-liquid state in pressurized oxygen (source).

What Is a Spin-Liquid?

A spin-liquid is an exotic quantum state in which the magnetic moments of electrons, known as spins, remain disordered even at absolute zero temperature. Unlike conventional magnets, where spins align in regular patterns, spin-liquids feature a dynamic state with long-range quantum entanglement. These states are of huge interest in condensed matter physics as they provide a platform for exploring quantum magnetism, topological phases, and potentially quantum computing.

Why Oxygen Is Special

Unlike other diatomic molecules such as nitrogen or hydrogen, oxygen possesses intrinsic magnetic properties due to its unpaired electrons. In solid form, oxygen becomes the only elemental solid that is an antiferromagnetic insulator at low temperatures. Theoretical studies had suggested that at very high pressures, oxygen could undergo a transition where its magnetism disappears, giving rise to a spin-liquid state. The new experiments now provide compelling evidence for this prediction.

The Discovery: Epsilon Oxygen

The researchers focused on a high-pressure phase of solid oxygen called epsilon oxygen (Ξ΅-O₂), formed at pressures above 10 GPa. By using single-crystal synchrotron X-ray diffraction, they probed unprecedentedly high-quality oxygen crystals. At around 18.1 GPa, they observed subtle but significant structural changes—specifically, an isostructural phase transition in which the overall crystal symmetry remained the same but the lattice constants and molecular spacing shifted.

These changes coincided with the collapse of the molecular magnetic moment, strongly indicating that the system had transitioned from a magnetic spin-liquid state to a non-magnetic spinless state. This marks the first indirect experimental evidence of a spin-liquid in oxygen.

Why This Matters

The implications are significant. Spin-liquids are typically associated with S=1/2 lattices, but the observed state in oxygen occurs within S=1 quartets of molecules, making it a unique discovery in solid-state physics. This expands the phenomenology of spin-liquids and suggests that oxygen could serve as a new experimental platform for studying unconventional quantum states.

Future Directions

The team plans to push their research further by attempting direct measurements of magnetic susceptibility under these extreme conditions—a highly challenging but essential step to confirm the nature of the spin-liquid. If successful, this could open new pathways in the study of quantum materials and deepen our understanding of matter under extreme environments such as planetary interiors.

More Information

*This article was prepared with the assistance of AI technologies.*

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#SpinLiquids #QuantumMaterials #CondensedMatterPhysics #PressurizedOxygen #ExoticStatesOfMatter #HighPressurePhysics #QuantumMagnetism #2DMaterials #MaterialsScience #Nanotechnology #PWmat #QuantumServerNetworks

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