Magnetic, transport and magnetotransport properties ofMn3+xSn1−xCand

Y. B. Li

¹

,

W. F. Li

²

,

Wenjiang Feng

³

et al.

Structural, magnetic and transport properties of Mn3.1Sn0.9 and Mn3.1Sn0.9N compounds

“…The resistivity of Mn 3.1 Sn 0.9 compound has a positive temperature coefficient, in consistent with the metallic conduction behavior. A similar behavior in temperature dependence of resistivity was also observed for the single crystal Mn 3.2 Sn 0.8 [27] and Mn 3.2 Sn 0.8 C compound [28], and those behaviors were interpreted in terms of the complicatedly magnetic transition and the magnetic scattering mechanism in its different magnetic states, respectively. From the Néel temperature 420 K to about 170 K (determined as the onset of the transition from the coexistence of WFM and AFM to that of enhanced FM and AFM, as shown in its inset), the Mn 3.1 Sn 0.9 compound is in a coexistence of WFM and AFM states, but the WFM component becomes gradually stronger with decreasing temperature.…”

“…A few investigation [28,33] suggested that in a number of manganese compounds, i.e. Mn 2 Sb, Mn 3 Zn y Sn 1−y C, MnBi, etc.…”

Magnetism, magnetocaloric effect and positive magnetoresistance in Fe-doped antipervoskite compounds SnCMn3−xFex (x=0.05–0.20)

“…On increasing the temperature, a sudden first-order transition from FIM state to paramagnetic (PM) state occurs at T C , which is concomitant with a discontinuous magnetization and an abrupt shrinkage of unit cell volume without a change of the type of the crystal structure [14,15]. As reported by Li et al previously, changing Sn/Zn or Mn/Sn ratio can significantly adjust the type of the magnetic transition and the transition temperature in SnCMn 3 [16]. Meanwhile, the pressure effect on the magnetic transition temperatures and thermal expansion for SnCMn 3 was also investigated systematically [15].…”

“…Obviously, it can be seen that T C and the M S gradually decrease with increase in the Fe-doping level x, while the lattice shrinks. As reported by Li et al, in the Sn 1 À x CMn 3 + x system, the lattice also shrinks with increase in x, while T C increases [16]. The FM coupling between the nearest Mn moments was thought to increase with decrease in Mn-Mn distance as x increases.…”

Dark energy from “extended modified gravity” and Gauss–Bonnet invariant term

“…Explanations have been sought within a wide range of physical phenomena, including the cosmological constant, exotic fields such as a Brans-Dicke scalar field (Brans and Dicke 1961), phantoms and quintessence, K-essence, viscous fluid, Chaplygin gas and Generalized Chaplygin, holographic dark energy and so on (El-Nabulsi 2008a, 2009a, 2009b, 2010a, 2010bSetare 2006aSetare , 2007Saridakis 2008a, 2008b). More recent DE models include the one containing a negative kinetic scalar field and a normal scalar field , or a single scalar field model (Li et al 2005) and interacting holographic dark energy models (Wang et al 2006). These cosmological models were constricted in order to gain insight into the occurrence of the transition of the dark energy equation of state and the mechanism behind this transition.…”