Pressure dependence of the magnetic transition temperature of the CoMnGe 1-x Si x system

Phase Transitions and Magnetocaloric Properties in MnCo1−xZrxGe Compounds

“…If the structural transition temperature ( ) shifts to coincide with , a magnetostructural phase transition with a large change in magnetization can be expected and can lead to large MCE values. Previous studies indicate that changes in stoichiometry, chemical composition, or application of external pressure can result in concurrent magnetic and structural transitions and therefore may increase the magnitude of magnetic entropy change to show a large MCE [9][10][11][12][13][14][15][16]. In this work, we present results on the partial replacement of Co by Zr in the MnCo 1− Zr Ge system, which exhibits a MST and a large MCE.…”

Structural and magnetic properties of MnCo 1−x Fe x Si alloys

“…As an MM'X compound, MnCoSi alloy shows a martensitic structural transition from the Ni 2 In-type hexagonal (P6 3 /mmc, 194) austenite to the TiNiSi-type orthorhombic (Pnma, 62) martensite at the temperature around 1165 K [1,13]. The Néel temperature ( N M ) of martensite is around 400 K [13][14][15].…”

“…The Néel temperature ( N M ) of martensite is around 400 K [13][14][15]. Below N M , the martensite phase has a special double helical magnetic structure and shows a competition between the antiferromagnetic (AFM) and ferromagnetic (FM) couplings [14,15].…”

“…According to the previous neutron diffraction studies [16], the exchange interactions between Mn-Mn and Mn-Co atoms are complicated with FM and AFM couplings coexisting in the system. Temperature [14,15], pressure [13,17], and magnetic field [14,18] can drive a first-order transition from an AFM to an FM state in MnCoSi-based compounds. Chemical composition change by substituting Ni for Co [19,20] or Ge for Si [18,21,22] in MnCoSi can also convert the AFM martensite to FM one.…”

The Effect of Cr doping on the Magnetic and Magnetocaloric Properties of MnCoGe Alloys

“…Several groups have investigated the CoMnGe [12][13][14][15][16][17]. It has been observed that the T struct of this transition is highly dependent on the level of occupation of the Mn and Co sites [18].…”