Metallic ferromagnetism

In the conventional view of metallic ferromagnetism, it is driven by 'exchange energy' between conduction electrons in rigid bands. We have proposed an alternative way to understand the origin of ferromagnetism in metals, namely that it is driven by kinetic energy lowering, or equivalently effective mass reduction, or equivalently band broadening, or 'undressing' of carriers, that occurs upon spin polarization. The origin of the effect is bond-charge Coulomb repulsion between electrons. The following papers describe our work on the subject.

Metallic Ferromagnetism in a Single Band Model. Phys. Rev. B 40, 2354. (1989)

Metallic Ferromagnetism in a Single Band Model. II: Finite Temperature Magnetic Properties. Phys. Rev.B 40, 9061. (1989)

Ferromagnetism in Metallic Hydrogen. Phys. Lett. A 141, 191. (1989)

Spin-Split States in Metals. Phys. Rev. B 41, 6820. (1990)

Chromium: A Possible Spin-Split Metal. Phys. Rev. B 41, 6828. (1990)

Mechanism of Metallic Ferromagnetism. 34th Annual Conf. on Magnetism & Magnetic Materials, Boston, MA, Nov. 28-Dec. 1, 1989. J. Appl. Phys. Supplement 67, 4549. (1990)

Superconductivity and Hydromagnetism. Proc. Intl. Conf. on the Physics of Highly Correlated Electron Systems, Santa Fe, New Mexico, 11-15 Sept. 1989. Physica B 163, 291. (1990)

Metallic Ferromagnetism in a Single-Band Model. III. One-Dimensional Half-Filled Band. Phys. Rev. B 42, 771. (1990) (w/ S. Tang)

Spin-Split States in Aromatic Molecules. Mod. Phys. Lett. B 4, 739. (1990)

Spontaneous Electrostatic Potential in Spin-Split Metals. Phys. Rev. B, 42, 4774 (1990).

Metallic Ferromagnetism in a Single-Band Model. IV. Effect of Pair Hopping. Phys. Rev. B 43}, 705 (1991).

Weak Ferromagnetism in a Band Model: Application to Sc3In. Physical Review B 44, 675-685 (1991).

Metallic ferromagnetism in a single-band model: Effect of band filling and Coulomb interactions. Phys. Rev. B 54, 6364 (1996). (w/ J. Amadon)

Possible contribution of direct exchange to the superfluidity of 3He. Phys. Rev. B 55, 8997 (1997).

Metallic ferromagnetism in a band model: intra-atomic versus interatomic exchange Phys. Rev. B 56, 11022(1997).

Metallic ferromagnetism from kinetic-energy gain: The case of EuB6 Phys. Rev. B 59, 436 (1999)

Metallic ferromagnetism without exchange splitting Phys. Rev. B 59, 6256 (1999)

Superconductivity and Ferromagnetism from Effective Mass Reduction , presented at the 6th International Conference on Materials and Mechanisms of Superconductivity, Houston, February 2000, Physica C 341-348, 211 (2000).

Ferromagnetism from Undressing , cond-mat/0007454, Phys. Rev. B62, 14131 (2000).

Quasiparticle undressing: a new route to collective effects in solids , cond-mat/0211642 (2002), in "Concepts in Electron Correlation", ed. by A.C. Hewson and V. Zlatic, Kluwer Academic Publishers, Dordrecht, 2003, p. 371.