Finite-temperature phase diagram of nonmagnetic impurities in high-temperature superconductors using a d=3 tJ model with quenched disorder
Michael Hinczewski, A. Nihat Berker
DOI 10.1103/PhysRevB.78.064507 · Physical Review B
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Abstract
We study a quenched disordered d=3 tJ Hamiltonian with static vacancies as a model of nonmagnetic impurities in high-Tc materials. Using a renormalization-group approach, we calculate the evolution of the finite-temperature phase diagram with impurity concentration p and find several features with close experimental parallels: Away from half filling, we see the rapid destruction of a spin-singlet phase (analogous to the superconducting phase in cuprates) which is eliminated for p≳0.05; in the same region for these dilute impurity concentrations, we observe an enhancement of antiferromagnetism. The antiferromagnetic phase near half filling is robust against impurity addition and disappears only for p≳0.40.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La2-xSrxCu1-zZnzO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La2Cu1-zZnzO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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