Magnetic properties of the CrS_xTe_1−x (x = 0−0.2) solid solutions

Abstract

On the basis of X‐ray, magnetic and neutron diffraction measurements the range of solubility in the CrSxTe1−x (x = 0−0.2) system has been established and the magnetic phase diagram of the system has been plotted. The decrease of magnetization at low temperature and the additional reflections in the neutron diffraction patterns are associated with the formation of noncollinear magnetic structure which is characterized by the antiferromagnetic component of the magnetic moments. This component has the orthorhombic unit cell with \documentclass{article}\pagestyle{empty}\begin{document}$ a_M = \sqrt {3a_0 } $\end{document}, bM = a0, cM = c0. The character of the exchange interactions giving rise to this magnetic structure is discussed.

Electronic Structure and Magnetic Properties of Chromium Chalcogenides and Pnictides with NiAs Structure

“…The resulting competition between the oscillating ferromagnetic and antiferromagnetic exchange should lead to complex spin configurations including frustration and non‐collinear magnetic order in these systems 32,33. In the case of CrTe, a phase transition to a state with dominantly collinear configuration (FM) was observed around the temperature 280 K. The temperature of this transition ( T C ) is in reasonably good agreement with that obtained in experiment (350 K,10 320 K11). Further decrease of the temperature leads to another phase transition at T ≈ 30 K. The magnetic state below this temperature is characterized by a small effective total magnetic moment caused by the non‐collinear magnetic structure shown in Figure 5 30.…”

“… Magnetic phase diagram for CrTe 1– x Se x system. Theoretical results30 obtained in the present work are compared with experimental results 10…”

“…The same structure properties have been observed also for the Cr‐Se as well as Cr‐(Te, Se) systems,8,9 while their magnetic properties are substantially different. According to experimental measurements, the stoichiometric CrTe compound exhibits a transition from the paramagnetic (PM) to the ferromagnetic (FM) state at the temperature T C ≈ 340 K, and then to the non‐collinear (NC) magnetic state at T cr ≈ 170 K 10. CrSe has NC umbrella‐like magnetic structure below T C ≈ 300 K with antiparallel alignment of the Cr1 and Cr2 sub‐lattices 11,12.…”

Large Linear Negative Thermal Expansion in NiAs-type Magnetic Intermetallic Cr–Te–Se Compounds

“…Here, this magnetic peak was specified as peak (100) M . 20 The NPD pattern along with the fitting curve at 150 K of CrTe 0.9 Se 0.1 is presented in Figure 1(b). The Rietveld refinement shows that the spins from Cr1 (0, 0, 0) and Cr2 (0, 0, 0.5) are ordered along the c axis at 150 K ferromagnetically, and the magnetic moment of Cr is determined to be 1.87(3) μ B .…”

“…15−19 Furthermore, CrTe can keep its NiAs-type structure only when the atomic fraction of Te is between 52.4% and 53.3%, indicating that it is necessary for the Cr vacancy to hold the NiAs-type structure. 15,20 Its lattice parameter (a) deviates from normal thermal expansion law, together with an obvious NTE of volume in the temperature range near T C . 21,22 Recently, the correlation between lattice parameter (a) and magnetic properties has been found to originate from the strong mixing bond between the nearest neighbor Cr and Te atoms.…”