Far-infrared spectroscopy of the supreconductor YBa2Cu4O8
作者： A. P. Litvinchuk , C. Thomsen , P. Murugaraj , M. Cardona
DOI: 10.1007/BF01323725
关键词: Lattice (order) 、 Spectroscopy 、 Condensed matter physics 、 Raman scattering 、 Superconductivity 、 Far infrared spectroscopy 、 Phonon 、 Physics 、 Plasma oscillation
摘要: The frequencies of allB1u(z) phonon modes predicted by a group-theoretical analysis were measured and found to agree well with recent lattice dynamical calculations for this compound. We report also the determination two superconducting gap values in YBa2Cu4O8 through self-energy effects normal conducting state. gap-to-T c ratios obtained from an these are 2Δ1/kT ≦2.5 5.8≦2Δ2/kT ≦9.2. This coincides previous results both phononic electronic Raman scattering where 2.1 6.3 found. further find anomalous softenings ∼40 Kabove T , which correlate observed deviation linear temperature dependence average plasma frequency ν p (T).
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sci-hub.se 参考文章(35)
T. W. Noh, P. E. Sulewski, A. J. Sievers, Comparison of the electrodynamic properties of sintered YBa2Cu3O7-y and La1.85Sr0.15CuO4-y. Physical Review B. ,vol. 36, pp. 8866- 8869 ,(1987) , 10.1103/PHYSREVB.36.8866
B. Friedl, C. Thomsen, M. Cardona, Determination of the superconducting gap in R Ba 2 Cu 3 O 7 − δ Physical Review Letters. ,vol. 65, pp. 915- 918 ,(1990) , 10.1103/PHYSREVLETT.65.915
H. A. Mook, M. Mostoller, J. A. Harvey, N. W. Hill, B. C. Chakoumakos, B. C. Sales, Observation of phonon softening at the superconducting transition in Bi2Sr2CaCu2O8. Physical Review Letters. ,vol. 65, pp. 2712- 2715 ,(1990) , 10.1103/PHYSREVLETT.65.2712
P. E. Sulewski, T. W. Noh, J. T. McWhirter, A. J. Sievers, Far-infrared composite-medium study of sintered La2NiO Physical Review B. ,vol. 36, pp. 5735- 5738 ,(1987) , 10.1103/PHYSREVB.36.5735
L. Genzel, A. Wittlin, M. Bauer, M. Cardona, E. Schönherr, A. Simon, Phonon anomalies and range of superconducting energy gaps from infrared studies of YBa2Cu3O7- delta. Physical Review B. ,vol. 40, pp. 2170- 2178 ,(1989) , 10.1103/PHYSREVB.40.2170
Yi Liu, Ju Young Lee, Michael J. Sumner, R. Sooryakumar, Thomas R. Lemberger, RAMAN-SCATTERING STUDY OF HIGH-TC FILMS OF THE ORDERED DEFECT STRUCTURE YBA2CU4O8-DELTA Physical Review B. ,vol. 42, pp. 10090- 10097 ,(1990) , 10.1103/PHYSREVB.42.10090
E. T. Heyen, R. Liu, C. Thomsen, R. Kremer, M. Cardona, J. Karpinski, E. Kaldis, S. Rusiecki, Optical phonons in YBa2Cu4O8 and Y2Ba4Cu7O15- delta. Physical Review B. ,vol. 41, pp. 11058- 11067 ,(1990) , 10.1103/PHYSREVB.41.11058
W. Kress, U. Schröder, J. Prade, A. D. Kulkarni, F. W. de Wette, Lattice dynamics of the high-TcsuperconductorYBa2Cu3O7−x Physical Review B. ,vol. 38, pp. 2906- 2909 ,(1988) , 10.1103/PHYSREVB.38.2906
B. Friedl, C. Thomsen, E. Schönherr, M. Cardona, Electron-phonon coupling of apex oxygen in RBa2Cu3O7−δ Solid State Communications. ,vol. 76, pp. 1107- 1110 ,(1990) , 10.1016/0038-1098(90)90974-G
Radoš Gajić, J Schützmann, J Betz, T Zetterer, HH Otto, PE Obermayer, KF Renk, Pronounced phonon softening in the far-infrared spectra of YBa2(Cu1−xZnx)3O7 Solid State Communications. ,vol. 78, pp. 65- 68 ,(1991) , 10.1016/0038-1098(91)90810-I