Raman scattering study of CaB6 and YbB6
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Qualitative inorganic analysis
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The effect of several divalent cations on cell adhesion was estimated in monolayer cell cultures. The exclusion of the divalent cations (Ca and Mg) from Hanks' balanced salt solution resulted in rapid cell detachment from the glass substratum. Detached cells would reattach when these divalent cations again were introduced into the medium. Other divalent cations were found to have effects similar to those of calcium or magnesium on cell detachment and reattachment, with the exception of strontium which showed no interference with cell contact abilities.
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Based on Zener Model,the dependences of Curie temperature of DMS materials(Ga,TM)As(TM=Sc,Ti,V,Cr,Mn,Fe,Co,Ni) on the doping concentration and anti-ferromagnetic exchange were discussed in detail by a theoretical computation.The results indicated that the influence of anti-ferromagnetic exchange on the Curie temperature of(Ga,TM)As should not be ignored,and the influence on the Curie temperature of n-type semiconductor is much stronger than that of p-type semiconductor.Considering the influence of the anti-ferromagnetic exchange,ferromagnetism can not obtained in the room temperature for materials except(Ga,Cr)As and(Ga,Mn)As.(Ga,Cr)As and(Ga,Mn)As display the room temperature ferromagnetism as the doping concentration reaches to 13.1% and 18%,respectively.However,when the relative strength increases to the value y=0.01,the materials do not present ferromagnetism anymore in any doping concentration.
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We investigate the effect of the Dzyaloshinskii-Moriya interaction (DMI) on the Curie temperature of the ultrathin ferromagnetic layers. It has been known that the Curie temperature of the ferromagnet depends on spin wave excitation energies, and they are affected by DMI. Therefore, the ferromagnetic transition temperature of the ultrathin ferromagnetic layer must be sensitive on the DMI. We find that the Curie temperature depends on the DMI by using the double time Green's function method. Since the DMI is arisen by the inversion symmetry breaking structure, the DMI is always important in the inversion symmetry breaking ultrathin ferromagnetic layers.
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Curie temperature of diluted magnetic semiconductor (DMS) has a strong dependence on the hole carrier concentration. In this paper, we analyzed the influence of anti-ferromagnetic exchange interaction on the Curie temperature of DMS based on the local hole model. The results showed that the influence of anti-ferromagnetic exchange interaction on the Curie temperature is closely related to the concentration ratio of magnetic ions to holes. When ni/nc10000, the influence of anti-ferromagnetic exchange interaction on the Curie temperature is very noticeable. When ni/nc10, the above-mentioned influence will be significantly weakened. With the increase of hole concentration, the holes will greatly restrain the anti-ferromagnetic exchange interaction.
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Magnetic semiconductor
Curie constant
Curie's law
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In this paper we study about both size and shape effects on the Transition temperature of ferromagnetic nanocrystals for the first time. Also a thermodynamic approach is proposed to the mechanism of size and shape dependent of ferromagnetic transition temperature. One relation that is obtained, is a simple and unified function without any adjustable parameter that pre-established for the size dependent of ferromagnetic. Also to find of shape effects on the Curie temperature of ferromagnetic nanoparticles a model was developed, that is based on the relation cohesive energy and temperature variations.
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Measurements of magnetization at temperatures down to 4·2 °K and in fields up to 17 kOe have been made on three samples of ZrZn2 having Fe contaminations of 25, 55 and 500 parts per million; Curie temperatures have also been determined. All three samples are ferromagnetic and have Curie temperatures of 22 °K, 21 °K and 17 °K respectively. It is suggested that ZrZn2 is intrinsically ferromagnetic.
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Curie's law
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We obtained thermodynamic parameters of an antiparallel G-quartet formation of d(G4T4G4) with 1 mM divalent cation (Mg2+, Ca2+, Mn2+, Co2+, or Zn2+). In addition, we also found that a higher concentration of a divalent cation induced a transition from an antiparallel to a parallel G-quartet structure. These results indicate that the divalent cations are a good tool for regulating the G-quartet structures and their stability.
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