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Aperiodic composite crystals were discovered that emulate 2D moiré materials, demonstrating a potentially scalable approach for producing moiré materials for next-generation electronics and a generalizable approach for realizing theoretical predictions of higher-dimensional quantum phenomena.

Experiments on YBa₂Cu₃O_6.51 reveal more than one carrier pocket, and evidence is found for the existence of a much larger pocket of heavier mass carriers having a thermodynamically dominant role in this hole-doped superconductor.

Quantum oscillations serve as an important probe of electronic structure of quantum materials. Yang et al. study quantum oscillations in the electronic specific heat of natural graphite, unveiling a double-peak structure absent in commonly used theory, and show its utility in determining the Landé g-factors.

Quantum oscillations in the three-dimensional topological semimetal CoSi are reported, where selected oscillation frequencies have no corresponding extremal Fermi surface cross-sections, representing instead oscillations of the quasiparticle lifetime.

Experimental evidence of coherent charge transport in the normal state of the kagome metal CsV₃Sb₅ is presented, revealing the nature of correlated order in kagome metals and new directions for exploring quantum coherence in correlated electron systems.

Superconductivity in the iron pnictides is believed to be related to quantum critical fluctuations. Putzke et al. observe unexpected anomalies in the critical fields of BaFe₂(As_1−xP_x)₂that emerge close to its magnetic critical point, which they argue is a generic feature of quantum critical superconductivity.

Angle-resolved photoemission spectroscopy of CaNi₂ shows a band with vanishing dispersion across the full 3D Brillouin zone that is identified with the pyrochlore flat band as well as two additional flat bands that arise from multi-orbital interference of Ni d-electrons.

A 3D quantum Hall effect has been reported in Dirac semimetal ZrTe₅ due to a magnetic-field-driven Fermi surface instability. Here, the authors show evidence of quasi-quantized Hall response without Fermi surface instability, but they argue that it is due to the interplay of the intrinsic properties of ZrTe₅ electronic structure and Dirac semi-metallic character.

Using two newly developed immunoassays tested in three clinical cohorts, this study highlights CSF DOPA decarboxylase as a promising biomarker for differentiating dementia with Lewy bodies and Parkinson’s disease from Alzheimer’s disease and controls.

Loss-of-function variants in thyroid hormone transporter MCT8 cause a neurodevelopmental and metabolic disorder. Here the authors identify genotype-phenotype relationships, advance insights in MCT8 (dys)function and create a pathogenicity-severity variant classifier.

The phase diagram of the unconventional superconductor Sr₂RuO₄ in both normal and superconducting states is mapped out using high-precision measurements of the elastocaloric effect, showing similarities to other unconventional superconductors as well as unique features.

A prototypical kagome metal with magnetic and topological properties is identified.

Measurements on a chiral magnet show that non-symmorphic symmetries enforce topological crossings exactly at the Fermi level in certain materials; these crossings can be controlled by an applied magnetic field.

Using torque magnetometry, the thermodynamic signatures of bosonic Landau level transitions are observed in a layered superconductor, owing to the formation of Cooper pairs with finite momentum.

In Weyl semimetals, unusual electronic transport phenomena are predicted to occur, such as an axial anomaly which violates the conservation of chiral fermions. Here, the authors evidence such behaviour via the occurrence of negative magnetoresistance in layered high-purity non-magnetic metals.

The rich magnetic phase behaviour of MnSi reflects the complexity of the physics underlying itinerant ferromagnetism. Here the authors present evidence that MnSi is strongly influenced by Hund’s coupling effects, suggesting a broader class of materials may fall into the class of Hund metals.

The topological character of electrons in semimetals subtly influences their bulk properties, leading typically to weak experimental signatures. Here, Moll et al. report a distinctive anomaly in the magnetic torque upon entering quantum limit state in the Weyl semimetal NbAs, which only appears due to the presence of Weyl fermions.

Insights into the behavior of quantum materials are only possible because of the development of suitable experimental probes. Modic et. al. develop the theoretical and experimental basis for resonant torsion magnetometry—a technique to measure anisotropic magnetic responses with high sensitivity.

In compounds containing 4f and 5f elements, hidden-order phases exist which are undetectable by many methods, the origins of which are debated. Here, the authors use photoemission and neutron scattering methods to show how such a multipolar-ordered phase emerges due to Fermi surface instability in CeB₆.

Electronic excitations with energies near the superconducting energy gap are strongly affected by superconducting transitions. The authors show, with a comprehensive optical investigation, that excitations with energies up to two orders of magnitude greater are also affected by the transition.

Landau states are associated with the quantised orbits of charged particles in magnetic fields. By manipulating electron vortex beams in a magnetic field, this study reconstructs the internal quantum dynamics of free-electron Landau states, which differs strongly from the classical cyclotron rotation.

As well as providing subatomic-scale real-space images of metals, the scanning tunnelling microscope also reveals momentum–space information. Now it is possible to use this technique to image a heavy-electron liquid and obtain information on orbital structures.

The identification of the magnetic-fluctuation mode at a quantum phase transition of the archetypical heavy-fermion compound Ce_1−xLa_xRu₂Si₂ indicates that quantum criticality in this system is governed by collective antiferromagnetic behaviour, rather than by local magnetic moments as has been suggested.

A genetic-algorithm approach to analysing quantum oscillations in a high-temperature superconductor reveals that quasiparticles behave as nearly free spins—split into spin-up and spin-down populations, known as the Zeeman effect.

What drives a phase transition in the heavy-fermion compound URu₂Si₂ is one of the major unsolved problems in condensed-matter physics. Numerical calculations now demonstrate how antiferromagnetic ordering leads to a symmetry breaking that alters the material’s band structure and therefore its electronic properties.

The authors study the formation and characteristics of a Majorana metallic quantum spin liquid state in Kitaev’s honeycomb model under a moderate external magnetic field. This state represents a novel class of gapless quantum spin liquids stabilized by magnetic field.

Flat-band materials such as kagome and moiré lattices and strongly correlated electron systems including heavy-fermion compounds exhibit strikingly similar phenomena of topology and strong correlations. This Perspective article discusses Kondo physics as the underlying theme and a route to a unified understanding.

Evidence of modulated metallic and superconducting states stemming from an incommensurate structural stripe motif is reported in the bulk van der Waals superlattice SrTa₂S₅.

Presence of peritoneal metastasis is associated with a decreased survival in patients with colorectal cancer. Here, the authors show that peritoneal-resident macrophages promote the formation of an immunosuppressive environment that facilitate peritoneal metastasis in colorectal cancer.

Combining the electronic properties of topological materials and superconductivity is predicted to yield exotic new transport phenomena. Here, the authors evidence surface superconductivity in the topological insulator Sb₂Te₃below 9 K induced by Te vapour over-pressuring during crystal growth.

Heavy-fermion superconductors feature a magnetic quantum critical point linked to the Kondo effect breakdown. Wang et al. use pressure-dependent Hall measurements to identify a crossover energy scale, confirming this in pure CeRhIn₅, while revealing a shift to spin density wave criticality with Sn-doping.