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.