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Origin of the Suppression of Magnetic Order in MnSi under Hydrostatic Pressure. | LitMetric

AI Article Synopsis

  • The study examines how hydrostatic pressure affects the magnetic moment (m) and exchange interaction (J) in the helimagnetic phase of the material MnSi.
  • Findings indicate that the loss of magnetic order at around 1.5 GPa is due to the collapse of the exchange interaction J, rather than a reduction in magnetic moment caused by quantum fluctuations.
  • The results also suggest a change in the magnetic wave vector at pressures above about 1.2 GPa, indicating the need for further analysis of the crystal structure in this pressure range.

Article Abstract

We experimentally study the evolution of the magnetic moment m and exchange interaction J as a function of hydrostatic pressure in the zero-field helimagnetic phase of the strongly correlated electron system MnSi. The suppression of magnetic order at ≈1.5  GPa is shown to arise from the J collapse and not from a quantum fluctuations induced reduction of m. Our work provides benchmarks for first principles theories that are challenged by the presence of strong correlations and the possible role of Hund's coupling. In addition, our experimental data are consistent with a reorientation of the magnetic propagation wave vector recently evidenced above ≈1.2  GPa. This result calls for a thorough investigation of the crystal structure in this pressure range.

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Source
http://dx.doi.org/10.1103/PhysRevLett.133.236502DOI Listing

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