Ferromagnetism within the Periodic Anderson Model: A New Approximation Scheme
نویسندگان
چکیده
منابع مشابه
Ferromagnetism in the Periodic Anderson Model
We compare different approximation schemes for investigating ferromagnetism in the periodic Anderson model. The use of several approximations allows for a detailed analysis of the implications of the respective methods, and also of the mechanisms driving the ferromagnetic transition. For the Kondo limit, our results confirm a previously proposed mechanism leading to ferromagnetic order, namely ...
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Using the constrained-path Monte Carlo method, we studied the magnetic properties of the two-dimensional periodic Anderson model for electron fillings between 1/4 and 1/2. We also derived two effective low-energy theories to assist in interpreting the numerical results. For 1/4 filling, we found that the system can be a Mott or a charge-transfer insulator, depending on the relative values of th...
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We introduce a new aproximation scheme for the periodic Anderson model (PAM). The modified alloy approximation represents an optimum alloy approximation for the strong coupling limit, which can be solved within the CPA-formalism. Zerotemperature and finite-temperature phase diagrams are presented for the PAM in the intermediate-valence regime. The diversity of magnetic properties accessible by ...
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The effect of binary alloy disorder on the ferromagnetic phases of f-electron materials is studied within the periodic Anderson model. We find that disorder in the conduction band can drastically enhance the Curie temperature T{c} due to an increase of the local f moment. The effect may be explained qualitatively and even quantitatively by a simple theoretical ansatz. The emergence of an alloy ...
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Unjong Yu,1,2 Krzysztof Byczuk,1,3 and Dieter Vollhardt1 1Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany 2Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA 3Institute of Theoretical Physics, University of Warsaw, ul. Hoża 69, 00-681 Warszawa, Polan...
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ژورنال
عنوان ژورنال: physica status solidi (b)
سال: 1998
ISSN: 0370-1972,1521-3951
DOI: 10.1002/(sici)1521-3951(199808)208:2<473::aid-pssb473>3.0.co;2-d