Colossal angular magnetoresistance in ferrimagnetic nodal-line semiconductors

Magnetic Structure and Spin Fluctuations in Colossal Magnetoresistance Ferrimagnet Mn3Si2Te6

“…Therefore, the net magnetic moment, according to the magnetic configuration in Fig. 3 This is perfectly consistent with the saturated magnetization of 1.56 µ B /Mn in the basal plane at µ 0 H > 0.1 T [1,14]. We note there is a slight misalignment of the crystal orientation where the applied field deviates from the crystalline c-axis by 3 • , which translates into a in-plane field sin(3 • ) • 1 T=0.05 T (close to 0.1 T) that overcomes the coercive field.…”

“…[1] and later confirmed in Ref. [14], prompt a thorough reexamination of the spin configuration. Figure 1(c) shows the temperature (T ) dependence of the (1, 0, 0) reflection that clearly exhibits an enhancement in amplitude below T c ∼ 78 K. A detailed comparison of wavevector scans through the same peak at 10 K and 120 K further confirms the extra magnetic scattering intensity is about 10% of the nuclear one.…”

“…The CMR occurs only when the magnetic field, H, is applied along the c axis and it is absent when H is applied within the basal plane. This specific character is later confirmed in a separate study, in which the CMR is attributed to the formation of the nodal-line structure of the valence Te band [14]. Nevertheless, an adequate understanding cannot be established without an thorough microscopic identification of the spin structure, which is conspicuously lacking.…”

“…The magnetic response to the applied magnetic field described above make the observed CMR with seven orders of magnitude drops in resistivity in Mn 3 Si 2 Te 6 indeed exceptional [1]. Seo et al propose that the main mechanism driving an insulator-metal transition is the magnetic valve effect, where the spin rotation by external fields drastically reduce the electronic band gap and the charge conduction [14]. In light of the neutron diffraction data presented in Figs.…”

Coupling between improper ferroelectricity and ferrimagnetism in hexagonal ferrites

“…Multisublattice magnets show various fascinating properties, like spin-reorientation (SR) transitions [1][2][3][4][5][6][7][8], non-trivial ferrimagnetism and topological order [9][10][11][12][13][14][15][16][17], which owe their origin to various microscopic interactions. Moreover, the quest for efficient routes of manipulation of these microscopic interactions by the application of external stimuli in order to control the properties of these systems, is at the forefront of various research activities [17][18][19][20][21][22].…”