Pressure-Modulated Quantum Melting of Spin Order in the Kondo Lattice Mn1/4TaS2

Controlling and understanding the quantum phase transitions (QPTs) of the magnetically ordered phases of strongly correlated systems, such as heavy-Fermion materials, cuprate superconductors, is essential for uncovering the new physical phenomena in condensed matter physics. This study reports the observation of pressure-modulated magnetic QPTs (MQPTs) and heavy-Fermion-like behavior in a manually constructed Kondo lattice─Mn_1/4TaS₂. At low temperatures, pressure application induces quantum melting of magnetic order within the helical magnetic configuration of Mn_1/4TaS₂. As pressure increases, the system transitions from the heavy-Fermion-like state to a Kondo singlet state, accompanied by a reduction in effective mass. This transition is attributed to the enhanced shielding of local magnetic moments by conduction electrons under pressure, demonstrating the competition between Kondo screening and Ruderman–Kittel–Kasuya–Yosida interactions. This study establishes a framework for creating Kondo lattice phase diagrams featuring in situ complex MQPTs under applied pressure using intercalated TMDs.