2002/04/23 by Bumsoo Kyung, Kyung, Bumsoo, A.–M. S. Tremblay +2
Materials Science · Physics and Astronomy · #Advanced Chemical Physics Studies #FOS: Physical sciences #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con) #Theoretical and Computational Physics #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/0204500
13 pages, 5 figures
arxiv created 2002/04/23 · openalex publication_date 2002/04/23 · arxiv updated 2009/11/30 · openalex created_date 2022/08/31 · openalex updated_date 2026/07/28
In this paper the phase diagram of high Tc cuprates is it\nqualitatively studied in the context of competing orders: antiferromagnetism,\nd-wave superconductivity and d-density wave. it Local correlation\nfunctions are estimated from a mean-field solution of the t-J Hamiltonian.\nWith decreasing doping the superconducting mean-field TMFc and order\nparameter d begin to decrease below some characteristic doping xc \≃\n0.2 where short-range antiferromagnetic correlations begin to develop. it\nDynamical properties that involve the energy spectrum, such as the normal\nstate pseudogap, are calculated from effective interactions that are consistent\nwith the above-mentioned local correlation functions. The total excitation gap\n\Δtg (in the superconducting state) and the normal state pseudogap\n\Δpg are in good agreement with experimental results. Properties of\nthe condensate are estimated using an effective pairing interaction Veff\nwhich takes into account (pair breaking) antiferromagnetic correlations. These\ncondensate properties include condensation energy U(0), coherence gap\n\Δcg and critical field Hc2. The calculated coherence gap closely\nfollows the doping dependence of Tc or d, and is approximately given as\n\Δcg \∼ \Δtg-\Δpg within our numerical uncertainties.\nThe systematic decrease of superfluidity (d, U(0), \Δcg, Hc2),\nand systematic increase of \Δpg and \Δtg with decreasing\ndoping below xc have their natural explanation in our approach. The\noverall description is however qualitative since it does not appear possible to\nobtain results that are in quantitative agreement with experiment for all\nphysical quantities.\n