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A system’s properties near a quantum phase transition scale differently than near a finite-temperature phase transition. Here, the authors identify an anomalously small dynamic scaling exponent from magnetization and specific heat measurements in the itinerant ferromagnet SrCaRuO which is at odds with current theory.

Magnetism and superconductivity are considered to be linked in iron pnictides. The discovery by Blomberg et al. that the in-plane resistivity anisotropy in these compounds changes sign as a function of carrier concentration and type demonstrates the close connection between magnetism, nematicity and unconventional superconductivity.

Integrating an electronic device with a cavity can cause the electrons to couple to photons strongly enough to form hybrid modes. Now, the cavity effects induced by intrinsic graphite gates are shown to modify the low-energy properties of graphene.

The underlying physics of the strange metal phase observed in many strongly correlated materials is not well understood. Now, evidence emerges that antiferromagnetic spin fluctuations play an important role.

Distinguishing the two models that have been proposed to explain stripe-like spin order in the iron-based superconductors is challenging. Avci et al.report an additional spin-ordered phase between this stripe phase and the superconducting state that suggests it originates from weak itinerant magnetism.

Inelastic Raman scattering is used to probe the critical spin fluctuations in an iron pnictide superconductor, providing insights into the origin of nematic order in this system.

The pseudogap state in the cuprate superconductors shows signs of electronic pair formation above the superconducting temperature. Is it just a ‘precursor’ state or a separate (and competing) state? In fact, both interpretations seem to be correct.

It remains challenging to resolve the dynamics of charges with different mobilities in multi-band systems. Here, the authors report a Raman scattering study of the dynamics of holes and electrons in semimetallic SrIrO₃, which is well described by a marginal Fermi liquid phenomenology, with frequency dependent scattering rates close to the Planckian limit.

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.

The discovery of superconductivity in the heavy fermion compound UTe2, a potential topological and triplet-paired superconductor, has generated significant interest in condensed matter physics with particular interest in the nature of the Fermi surface. Here, the authors employed a contactless conductivity technique to investigate the quantum interference oscillations of compressed UTe2 up to 19.5 kbar, aiming to examine key features of its Fermi surface.

Magnetic splitting in an antiferromagnetic state of cubic NdBi gives rise to Fermi arcs with bands that have opposing curvature.

Nematic order in the iron-based superconductors breaks the symmetry between the x and y directions in the Fe plane. Beyond this, however, there is little consensus on how nematic order arises and whether it has an effect on superconductivity. This Review discusses the current theoretical and experimental state of the field.

The normal state of hole-doped, high-temperature superconductors is a currently-unexplained "strange metal" with exotic electronic behaviour. Here, the authors show that a doping-dependent power law ansatz for the electronic scattering phenomenologically captures ARPES, transport and optics observations.

A quantum spin liquid is an intriguing exotic state of matter involving a magnetic system in which a magnetically ordered ground state at low temperatures is avoided despite strong interactions between magnetic units, due to quantum fluctuations. Experimental evidence for the existence of such a state has become available, but there are many fundamental questions about this novel state. This study uses an advanced magnetic probing technique, called muon spin rotation, to study a molecular layered system that is widely regarded as a prime candidate for quantum spin liquid. A complex magnetic phase diagram for this system is determined and characteristic critical properties of the spin liquid are measured, thereby providing important new insights into this exotic state of matter.

Electronic nematicity, a unidirectional self-organized state that breaks the rotational symmetry of the underlying lattice, has been observed in an iron-based superconductor, BaFe₂(As_1−xP _x )₂, over a wide range of phosphorus concentration, resulting in a phase diagram similar to the pseudogap phase diagram of the copper oxides.

When CaFe₂As₂ is lightly doped with Co an electronic liquid-crystalline state emerges, which becomes the ‘parent’ state of high-temperature superconductivity in this ferropnictide. A spectroscopic imaging study shows that the ‘nematic’ order is likely to be an artefact of the doping itself.

The mechanism holding Cooper pairs together in iron-based superconductors is highly debated. Finding the fingerprint of the pairing mechanism would be a leap forward.

The heavy-fermion compound YbRh₂Si₂ possesses a quantum critical point, at which the standard theory of electron behaviour in metals is expected to break down; such anomalous behaviour has now been observed.

Scanning tunnelling spectroscopy is used to map the atomic-scale electronic structure of magic-angle twisted bilayer graphene, finding multiple signatures of electron correlations and thus providing insight into the sought-after mechanism behind superconductivity in graphene.

The pattern of electrical resistivity in an unconventional superconductor at high magnetic fields and low temperatures across the nematic quantum critical point reveals two classic signatures of quantum criticality.