Understanding the interplay between magnetic ordering and phonon thermal transport is crucial for the thermal management of two-dimensional magnetic devices. Here, using first-principles calculations combined with the phonon Boltzmann transport equation, we systematically investigate the lattice thermal transport properties of four-layer CrSBr during its layer-by-layer magnetic switching process. As the magnetic configuration evolves from the antiferromagnetic (AFM) state to the ferromagnetic (FM) state through successive spin reversals, the lattice thermal conductivity exhibits a pronounced nonmonotonic variation. In particular, the intermediate ferrimagnetic FiM1 state shows a dramatic reduction in thermal conductivity of approximately 37.2% along x and 54.5% along y compared with the AFM state, whereas the FiM2 and FM states retain thermal conductivities close to the AFM configuration. Detailed analysis reveals that magnetic switching only weakly affects harmonic phonon properties, including phonon dispersions and group velocities. In contrast, the FiM1 state exhibits strongly enhanced anharmonic phonon scattering and reduced phonon participation ratios in the low-frequency region dominated by heat-carrying phonons. Further layer-resolved vibrational analysis identifies a mixed vibrational character in the FiM1 state, combining AFM-like layer-selective and FM-like layer-equivalent features, which is correlated with enhanced low-frequency anharmonic phonon scattering. Our results reveal a unique mechanism for magnetically tunable thermal transport in van der Waals magnets and provide microscopic insights into magnetic-order-dependent phonon thermal transport in layered magnetic materials.

Barocaloric materials have attracted considerable attention as promising thermal-management alternatives to conventional vapour-compression technologies; however, virtually all reported systems exhibit only a single type of barocaloric effect (BCE), fundamentally constraining the functional versatility and accessible operating-temperature range of prospective devices. Here we report that two fluorinated alcohols, C₉H₆F₁₄O₂ (2OH) and C₉H₄F₁₆O (1OH), harbour two mechanistically distinct phase transitions within a single material family: a solid-solid transition giving rise to a conventional normal BCE, and a solid-liquid transition yielding a rare inverse BCE. By systematically tuning the number of hydroxyl substituents (-OH), the transition temperatures of these two processes can be shifted by several tens of kelvin, enabling their natural alignment with distinct low- and high-temperature operating regimes. This intrinsic thermal property allows both heating and cooling functions to be realized within the same material system, solely through the exploitation of its barocaloric characteristics. Remarkably, 1OH exhibits exceptional pressure sensitivity during solid-liquid transition, reaching 0.34 K/MPa at 100 MPa. These findings establish fluorinated alcohols as a versatile and high-performance material platform, and open new avenues for the rational design of next-generation barocaloric energy conversion technologies.

Hydrodynamic electron transport, in which electrical transport in solids resembles fluid hydrodynamics when momentum-conserving electron-electron scattering dominates, has attracted much attention over the past decade. However, its thermal aspects have received considerably less attention. In this paper, we systematically simulate electron transport in a graphene Corbino disk by solving the steady-state Boltzmann transport equation with a dual relaxation-time Callaway model, in which momentum-conserving and momentum-relaxing scatterings are explicitly distinguished. By varying the magnetic field strength and scattering rates, we compare the charge and heat flux responses across the diffusive-to-hydrodynamic crossover under both electric field and temperature-gradient driving. We show that magnetic-field-induced deflection of both fluxes is strongly enhanced in the hydrodynamic regime but nearly suppressed in the diffusive regime. Under electric-field driving, a pronounced temperature rise is observed in the hydrodynamic regime du to reduced dissipation, while the diffusive regime remains nearly isothermal. Under temperature-gradient driving, the deflection exhibits the opposite chirality to that in the electric-field case. These findings establish that thermal transport can provide a sensitive and independent diagnostic of electro hydrodynamics, and identify the magnetic field as an effective discriminator between collective and dissipative conduction.