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- W2028991851 abstract "The compounds ${mathrm{EuMn}}_{2}$ ${mathrm{Si}}_{2mathrm{ensuremath{-}}mathrm{x}}$ ${mathrm{Ge}}_{mathrm{x}}$ have been studied by $^{151}mathrm{Eu}$ and dilute $^{57}mathrm{Fe}$ Mossbauer spectroscopy, x-ray diffraction, magnetization, and resistivity measurements. In ${mathrm{EuMn}}_{2}$ ${mathrm{Ge}}_{2}$ , Eu is divalent and orders magnetically at 13 K. The Mn sublattice orders magnetically at ${mathrm{T}}_{mathrm{c}}$ =302 K. In ${mathrm{EuMn}}_{2}$ ${mathrm{Si}}_{2}$ the Eu ion is in a valence fluctuating state, at 90 K it is trivalent and at 650 K it is almost completely divalent. The Mn sublattice orders antiferromagnetically at ${mathrm{T}}_{mathrm{N}}$ =395 K, but at lower temperatures, 107, 65, and 32 K, undergoes spin reorientation transitions with a ferromagnetic component. Replacing ensuremath{sim}15% of Si by Ge in ${mathrm{EuMn}}_{2}$ ${mathrm{Si}}_{2}$ converts all Eu ions into their divalent state. In ${mathrm{EuMn}}_{2}$ ${mathrm{Si}}_{2mathrm{ensuremath{-}}mathrm{x}}$ ${mathrm{Ge}}_{mathrm{x}}$ , x=0.1, 0.2, at 90 K both divalent and trivalent Eu ions are present. As the temperature is raised towards a critical temperature a first order valence phase transition occurs, all ${mathrm{Eu}}^{3+}$ ions convert to ${mathrm{Eu}}^{2+}$ in a short range of temperatures. This first order valence phase transition is accompanied by the antiferromagnetic phase transition of the Mn sublattice. The formation of a single first order phase transition from two interacting order parameters, each of which by itself leads to an independent second order phase transition, is predicted by theory. This phase transition has a wide thermal hysteresis loop observed by Mossbauer studies (both $^{151}mathrm{Eu}$ and $^{57}mathrm{Fe}$), magnetization, x-ray diffraction, and resistivity measurements. For x=0.1, x=0.2 the transition temperatures are 370, 330 K with increasing temperature and 320, 275 K with decreasing temperature, respectively." @default.
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- W2028991851 title "Phase transitions of europium valency and manganese magnetic order and thermal hysteresis phenomena in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>EuMn</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Si</mml:mi></mml:mrow><mml:mrow><…" @default.
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- W2028991851 doi "https://doi.org/10.1103/physrevb.55.3033" @default.
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