Eur. Phys. J. B (2013) 86: 312
https://doi.org/10.1140/epjb/e2013-40037-0

Regular Article

Effect of screening of the electron-phonon interaction on the temperature of Bose-Einstein condensation of intersite bipolarons

¹ Institute of Nuclear Physics, 100214 Ulughbek, Tashkent, Uzbekistan
² Ahmed Yasawi Kazakh-Turkish International University, 161200 Turkestan, Kazakhstan

^a Permanent address: Nukus State Pedagogical Institute named after A’jiniyaz, 230105 Nukus, Karakalpakstan, Uzbekistan. e-mail: bakhrom.yavidov@gmail.com

Received: 15 January 2013
Received in final form: 16 April 2013
Published online: 8 July 2013

Abstract

Here, we consider an interacting electron-phonon system within the framework of extended Holstein-Hubbard model at strong enough electron-phonon interaction limit in which (bi)polarons are the essential quasiparticles of the system. It is assumed that the electron-phonon interaction is screened and its potential has Yukawa-type analytical form. An effect of screening of the electron-phonon interaction on the temperature of Bose-Einstein condensation of the intersite bipolarons is studied for the first time. It is revealed that the temperature of Bose-Einstein condensation of intersite bipolarons is higher in the system with the more screened electron-phonon interaction.