Spin glass and ferromagnetism in disordered cerium compounds
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چکیده
منابع مشابه
Spin Glass and ferromagnetism in disordered Cerium compounds
The competition between spin glass, ferromagnetism and Kondo effect is analysed here in a Kondo lattice model with an inter-site random coupling Jij between the localized magnetic moments given by a generalization of the Mattis model [15] which represents an interpolation between ferromagnetism and a highly disordered spin glass. Functional integral techniques with Grassmann fields have been us...
متن کاملSpin Glass and ferromagnetism in disordered Kondo lattice
The competition among spin glass (SG), ferromagnetism and Kondo effect has been analysed in a Kondo lattice model where the inter-site coupling Jij between the localized magnetic moments is given by a generalized Mattis model [5] which represents an interpolation between ferromagnetism and a highly disordered spin glass. Functional integral techniques with of Grassmann fields has been used to o...
متن کاملSpin glass and Ferromagnetism in Kondo lattice compounds
Spin glass and Ferromagnetism in Kondo lattice compounds S. G. Magalhães, A. A. Schmidt, Alba Theumann, and B. Coqblin 1 Departamento de F́ısica – UFSM, 97105-900 Santa Maria, RS, Brazil 2 Departamento de Matemática – UFSM, 97105-900 Santa Maria, RS, Brazil 3 Instituto de F́ısica – UFRGS, 91501-970 Porto Alegre, RS, Brazil 4 Laboratoire de Physique des Solides, Université Paris-Sud, 91405 Orsay, ...
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Dynamic magnetic properties of Y0.7Ca0.3MnO3 are reported. The system appears to attain local ferromagnetic order at TSRF ≈ 70 K. Below this temperature the low field magnetization becomes history dependent, i.e. the zero field cooled (ZFC) and field cooled (FC) magnetization deviate from each other and closely logarithmic relaxation appears at our experimental time scales (0.3-104 sec). The ze...
متن کاملGround State Degeneracy and Ferromagnetism in a Spin Glass
The Ising spin glass model on Z 2 has spins o i = + 1 on sites i ~ Z 2 and nearest -neighbor interact ion with coupling Jb = + 1, b ~ B, B the set of bonds. The Jb are i ndependen t r a n d o m variables with P rob ( J b = 1) = x. T h e r m o d y n a m i c funct ions such as the free energy and the magnet iza t ion are r a n d o m variables on the space of bond configurations. Cons ider a finit...
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ژورنال
عنوان ژورنال: Physical Review B
سال: 2006
ISSN: 1098-0121,1550-235X
DOI: 10.1103/physrevb.74.014427