Preformed pairs approach to the mass of the charge carrier in YBa2Cu3O6+x cuprate


Otajonov S.M. Khajibaev D.G. Jaksimuratov I.J. Uskenbaev D.E. Kh Karimbaev E. Ya Yavidov B.
1 April 2026Elsevier B.V.

Physica B: Condensed Matter
2026#727

This paper examines how the charge-carrier mass in YBa2Cu3O6+x varies with hole concentration p within the bipolaron framework of high-Tc superconductivity. We calculate the three-dimensional polaron mass mp(p) and the in-plane polaron mass mp(p,ab) across a range of doping levels, incorporating the p-dependent superconducting critical temperature Tc(p) and mass anisotropy factor γm2=mc∗/mab∗. As expected, the behavior of mp(p) shows a strong inverse correlation with the superconducting critical temperature, reflecting the relation mp(p)∼TBEC−1(p)≈Tc−1(p). In contrast, lattice anisotropy makes the two-dimensional polaron mass increase monotonically with doping. The calculated in-plane polaron masses are compared with theoretical estimates and experimental measurements, showing good consistency at moderate and optimal hole contents. These findings support the usefulness of the preformed-pair concept for understanding the high-Tc superconductivity in YBa2Cu3O6+x.

Bipolaronic superconductivity , Bose–Einstein condensation , Doping dependence , Mass anisotropy , Polaron mass , YBa2Cu3O6+x cuprate

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Nukus State Pedagogical Institute named after Ajiniyaz, Karakalpakstan, Nukus, 230105, Uzbekistan
Nukus State Technical University, Karakalpakstan, Nukus, 230103, Uzbekistan
S. Seifullin Kazakh Agrotechnical University, Astana, 010011, Kazakhstan
Institute of Fundamental and Applied Research of National Research University TIIAME, Tashkent, 100000, Uzbekistan
Institute of Nuclear Physics, Tashkent, 100214, Uzbekistan

Nukus State Pedagogical Institute named after Ajiniyaz
Nukus State Technical University
S. Seifullin Kazakh Agrotechnical University
Institute of Fundamental and Applied Research of National Research University TIIAME
Institute of Nuclear Physics

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