Pregled bibliografske jedinice broj: 927762
Correlation between axial oxygen anharmonicity and T_c in high temperature superconductors
Correlation between axial oxygen anharmonicity and T_c in high temperature superconductors // Bulletin of Americal Physical Society
Cincinnati (OH), Sjedinjene Američke Države: American Physical Society, 1991. str. 989-989 (predavanje, nije recenziran, sažetak, znanstveni)
CROSBI ID: 927762 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
Correlation between axial oxygen anharmonicity and T_c in high temperature superconductors
Autori
Allen, P. ; Mustre de Leon, J. ; Conradson, S.D. ; Batistić, I. ; Bishop, A.R.
Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni
Izvornik
Bulletin of Americal Physical Society
/ - : American Physical Society, 1991, 989-989
Skup
APS March Meeting
Mjesto i datum
Cincinnati (OH), Sjedinjene Američke Države, 18.03.1991. - 22.03.1991
Vrsta sudjelovanja
Predavanje
Vrsta recenzije
Nije recenziran
Ključne riječi
axial oxygen anharmonicity, superconductivity
Sažetak
The oxygen contributions to Cu K-edge polarized extended x-ray absorption fine structure (EXAFS) in La_{;2-x};Ba_xCuO_4, YBa_2Cu_2.8Co_0.2O_{;7+delta};, YBa_2Cu_3O_6.5, YBa_2Cu_3O_7, and TlBa_2Ca_3Cu_4O_11 at T=10K are analyzed, using radial distribution functions obtained from model potentials, to describe the effect of the Cu—O relative motion in the EXAFS signal. The analysis shows that, while the motion of the plane and chain oxygens is harmonic, the axial oxygen ater moves in a double well potential. The Cu—O pair potential becomes more anharmonic in systems with higher T_c, leading to a correlation between the interwell tunneling frequency and T_c. The results of this analysis are compared with infrared absorption and heat capacity measurements in these materials.
Izvorni jezik
Engleski
Znanstvena područja
Fizika
