Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1998-03-09
Phys. Rev. B vol 58, 8683 (1998)
Physics
Condensed Matter
Strongly Correlated Electrons
12 pages, includes 8 postscript figures. To appear in Physical Review B. References added
Scientific paper
10.1103/PhysRevB.58.8683
The interplay of disorder and spin-fluctuation effects in a disordered antiferromagnet is studied. In the weak-disorder regime (W \le U), while the energy gap decreases rapidly with disorder, the sublattice magnetization, including quantum corrections, is found to remain essentially unchanged in the strong correlation limit. Magnon energies and Neel temperature are enhanced by disorder in this limit. A single paradigm of disorder-enhanced delocalization qualitatively accounts for all these weak disorder effects. Vertex corrections and magnon damping, which appear only at order (W/U)^4, are also studied. With increasing disorder a crossover is found at W \sim U, characterized by a rapid decrease in sublattice magnetization due to quenching of local moments, and formation of spin vacancies. The latter suggests a spin-dilution behavior, which is indeed observed in softened magnon modes, lowering of Neel temperature, and enhanced transverse spin fluctuations.
Singh Avinash
Ulmke Martin
Vollhardt Dieter
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