Magnetic phase diagram of the half-filled t-t'-Hubbard model -- finite-U\n effects on competing interactions and frustration

2001/12/24 by A. Singh, Avinash Singh, Singh, Avinash
Physics and Astronomy · #FOS: Physical sciences #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.str-el

paper · pdf · doi:10.48550/arxiv.cond-mat/0112442

8 pages

arxiv created 2001/12/24 · openalex publication_date 2001/12/24 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The magnon propagator is evaluated in the AF (\π,\π,\π) and the F-AF\n(0,\π,\π) states at the RPA level, and the spin-fluctuation corrections are\ncompared. Transverse spin fluctuations are sharply enhanced by the frustration-\ninducing NNN hopping t', reducing the zero-temperature AF order in two\ndimensions, and the Neel temperature in three dimensions. The phase boundary\nbetween the insulating AF and F-AF states is obtained in the full range of\ninteraction strength, indicating that the AF state is interestingly stabilized\nwith decreasing U.\n

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