Pregled bibliografske jedinice broj: 72945
Electronically Induced Anomaly in LO Phonon Dispersion of High - $T_c$ Superconductors
Electronically Induced Anomaly in LO Phonon Dispersion of High - $T_c$ Superconductors // Fizika A, 10 (2001), 169-176 (podatak o recenziji nije dostupan, članak, znanstveni)
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Naslov
Electronically Induced Anomaly in LO Phonon Dispersion of High - $T_c$ Superconductors
Autori
Barišić, Slaven ; Mrkonjić, Ivana ; Kupčić, Ivan
Izvornik
Fizika A (1330-0008) 10
(2001);
169-176
Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni
Ključne riječi
superconductivity; high-Tc cuprates; La_{2-x}Sr_xCuO_4; YBa_2Cu_3O_{6+x}; LO phonons; oxygen-oxygen charge susceptibility; first order phase transition
Sažetak
The strong, electronically induced anomaly in the spectrum of the longitudinal optical (LO) phonons propagating along the main axes of the CuO$_2$ plane is tentatively attributed to the oxygen-oxygen charge transfer between the two oxygens in the plane. It is argued that this charge transfer can be large and that it is strongly coupled to the zone boundary LO phonons. The corresponding negative contribution to the free energy is quartic in the LO phonon amplitude, making the LO phonon unstable through the first order phase transition, with a concomitant domain structure.
Izvorni jezik
Engleski
Znanstvena područja
Fizika
