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UTe₂ is a proposed intrinsic topological superconductor, but its quasiparticle surface band has not yet been visualized. Now this is achieved using quasiparticle interference imaging, revealing the symmetry of the superconducting order parameter.

Chiral superconductors are predicted to realize Majorana normal fluid at its boundary, but remain elusive experimentally. Here, Bae et al. report anomalous surface normal fluid response in UTe₂ single crystal which is further attributed to a chiral spin-triplet pairing state.

Understanding the physics of charge density waves in emerging superconductors may reveal insights into unconventional superconductivity mechanisms. Here, the authors study the temperature and magnetic-field dependence of charge-density-wave suppression in the unconventional superconductor UTe₂.

Weak antilocalization is a signifier of electrical transport via topologically non-trivial surface states of a topological insulator, but it is often masked by dopant-induced scattering. Kim et al.overcome such difficulties to identify coherent transport via the topological surface states of bismuth selenide.

A spin-triplet pair density wave is discovered in the candidate topological superconductor UTe₂ using superconductive scanning tunnelling microscopy tips.

The symmetry of the superconducting order parameter in UTe₂ is still debated. Now ultrasound experiments suggest that the order parameter can only have one component.

The recently discovered spin-triplet superconductor UTe₂ is found to display a number of other ‘re-entrant’ superconducting phases under ultrahigh magnetic fields.

In addition to its low-field superconducting state, UTe₂ features a re-entrant superconducting state when high magnetic fields are applied at a particular range of angles. Here, the authors demonstrate that the high-field re-entrant superconducting state survives even when the low-field superconducting state is destroyed by disorder.

Despite their name, the bulk electrical conductivity of most topological insulators is relatively high, masking many of the important characteristics of its protected, surface conducting states. Counter-doping reduces the bulk conductivity of Bi₂Se₃ significantly, allowing these surface states and their properties to be clearly identified.

A mechanism for the phase transition of charge density wave states via the generation and proliferation of topological defects with opposite phase windings is demonstrated in a heavy-fermion superconductor.

Frustration in lattices of interacting spins can lead to rich and exotic physics, such as fractionalized excitations and emergent order. Here, the authors demonstrate a low-temperature transition from a disordered spin-ice-like phase to an emergent charge ordered phase in the bulk kagome Ising magnet Dy₃Mg₂Sb₃O₁₄.

A study using scanning tunnelling microscopy reveals a charge-density-wave state that is sensitive to magnetic fields and strongly intertwined with superconductivity in the heavy-fermion triplet superconductor UTe₂.

Scanning tunnelling microscopy and spectroscopy measurements show chiral edge states inside the superconducting gap of the heavy-fermion superconductor UTe₂, indicating the presence of chiral spin-triplet superconductivity.

Electrons in uranium-based materials are often on the border between localised and itinerant behaviour, which can lead to unusual magnetic behaviour. Here the authors combine experiment and theory to show that USb₂ may be an unusually high temperature example of a singlet-ground-state magnet.

The heavy-fermion superconductor UTe₂ has attracted recent interest for its novel superconducting phases, tunable by pressure and magnetic field. Here, a systematic study of anisotropic resistivity indicates an influence of quantum criticality that may be important to unconventional superconductivity in this compound.

UTe₂ receives significant attention as it may be an example of a spin-triplet superconductor but many features of this material are still to be fully understood. Here, the authors use muon spin rotation to investigate the existence of low-temperature magnetic clusters in single crystals of UTe₂ and discuss the potential relationship with the temperature dependent behaviour of the specific heat.

Extensive theoretical and experimental efforts have been devoted to the effect of quantum criticality in our understanding of the physics of high-temperature superconductors and strongly correlated electron materials, yet it remains a puzzle in condensed matter physics. The authors report observations of a quantum criticality by investigating the non-Fermi liquid thermodynamics and transport behaviour in a non-superconducting iron pnictide.