Magnetic Structure and Spin Fluctuations in Colossal Magnetoresistance Ferrimagnet Mn3Si2Te6

Abstract

The ferrimagnetic insulator Mn3Si2Te6, which features a Curie temperature Tc at 78 K and a delicate yet consequential magnetic frustration, exhibits colossal magnetoresistance (CMR) when the magnetic field is applied along the magnetic hard axis, surprisingly inconsistent with existing precedents [Y. Ni, H. Zhao, Y. Zhang et al. Phys. Rev. B 103, L161105 (2021)]. This discovery motivates a thorough single-crystal neutron diffraction study in order to gain insights into the magnetic structure and its hidden correlation with the new type of CMR. Here we report a noncollinear magnetic structure below the Tc where the moments lie predominantly within the basal plane but tilt toward the c axis by ~10o at ambient conditions. A substantial magnetic diffuse scattering decays slowly and persists well above the Tc. The evolution of the spin correlation lengths agrees well with the electrical resistivity, underscoring the role of spin fluctuation contributing to the magnetoresistivity near the transition. Application of magnetic field along the c axis, renders a swift occurrence of CMR but only a slow tilting of the magnetic moments toward the c axis. The unparalleled changes indicate a non-consequential role of magnetic polarization.

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References in corpus (6)

• Magnetoresistance in Mn pyrochlore: electrical transport in a low carrier density ferromagnet
• Magnetic order and interactions in ferrimagnetic Mn3Si2Te6
• Control of chiral orbital currents in a colossal magnetoresistance material
• Strange electrical transport: Colossal magnetoresistance via avoiding fully polarized magnetization in ferrimagnetic insulator Mn3Si2Te6
• Critical behavior and magnetocaloric effect in Mn${}_3$Si${}_2$Te${}_6$
• Polaronic transport and thermoelectricity in Mn${}_3$Si${}_2$Te${}_6$ single crystals

Cited by in corpus (17)

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• Current-sensitive Hall effect in a chiral-orbital-current state
• Anapole, chiral and orbital states in Mn3Si2Te6
• Electrically tunable, rapid spin-orbit torque induced modulation of colossal magnetoresistance in Mn${}_3$Si${}_2$Te${}_6$ nanoflakes
• Switchable in-plane anomalous Hall effect by magnetization orientation in monolayer ${\mathrm{Mn}}_3{\mathrm{Si}}_2{\mathrm{Te}}_6$
• Gap and magnetic engineering via doping and pressure in tuning the colossal magnetoresistance in (Mn${}_{1-x}$Mg${}_x$)${}_3$Si${}_2$Te${}_6$
• Impact of Thermal Effects on the Current-Tunable Electrical Transport in the Ferrimagnetic Semiconductor Mn${}_3$Si${}_2$Te${}_6$
• Nonequilibrium carrier and phonon dynamics in the ferrimagnetic semiconductor Mn${}_3$Si${}_2$Te${}_6$
• Emergent Inductance from Chiral Orbital Currents in a Bulk Ferrimagnet
• Magnetism and magnetoelastic effect in 2D van der Waals multiferroic CuCrP2S6
• Origin of pressure-induced anomalies in the nodal-line ferrimagnet Mn${}_3$Si${}_2$Te${}_6$
• Magnetic resonance and microwave resistance modulation in van der Waals colossal-magnetoresistance material
• Micromagnons and long-range entanglement in ferrimagnetic ground states
• Coherent Spin-Phonon Coupling in the Layered Ferrimagnet Mn3Si2Te6
• Inductance Meets Memory in the Quantum Magnet Mn3Si2Te6