Long-Range Order in Ideal Ferromagnets

نویسندگان

چکیده

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Duality in Long-Range Ising Ferromagnets

It is proved that for a system of spins σi = ±1 having an interaction energy − ∑ Kijσiσj with all theKij strictly positive, one can construct a dual formulation by associating a dual spin Sijk = ±1 to each triplet of distinct sites i, j and k. The dual interaction energy reads − ∑

متن کامل

Mean Field in Long-Range Ferromagnets and Periodic Boundary Conditions

Periodic boundary conditions are applied to a ferromagnetic spin lattice. A symmetrical lattice and its contributions all over space are being used. Results, for the Ising model with ferromagnetic interaction that decays as a 1/r law, are discussed in the mean field approximation.

متن کامل

Spin Superfluidity and Long-Range Transport in Thin-Film Ferromagnets.

In ferromagnets, magnons may condense into a single quantum state. Analogous to superconductors, this quantum state may support transport without dissipation. Recent works suggest that longitudinal spin transport through a thin-film ferromagnet is an example of spin superfluidity. Although intriguing, this tantalizing picture ignores long-range dipole interactions; here, we demonstrate that suc...

متن کامل

Magnetic properties of quantum Heisenberg ferromagnets with long-range interactions.

Quantum Heisenberg ferromagnets with long-range interactions in low dimensions are investigated by means of the Green’s function method. The model Hamiltonian is given by H = −(J0/2) ∑ i6=j r −p ij Si · Sj − H ∑ j S z j . It is shown that there exists a finite-temperature phase transition in the region d < p < 2d for the d-dimensional case and that no transitions at any finite temperature exist...

متن کامل

Long Range Order in Random Anisotropy Magnets

High temperature series for the magnetic susceptibility, χ, of random anisotropy axis models in the limit of infinite anisotropy are presented, for two choices of the number of spin components, m. For m=2, we find T c =1.78 J on the simple cubic lattice, and on the face‐centered cubic lattice we find T c =4.29 J. There is no divergence of χ at finite temperature for m=3 on either lattice. For t...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Progress of Theoretical Physics

سال: 1969

ISSN: 0033-068X

DOI: 10.1143/ptp.42.1086