A. Wittlin
Max Planck Society
19 Papers
553 Citations
A. Wittlin is an academic researcher from Max Planck Society. The author has contributed to research in topics: Superconductivity & Phonon. The author has an hindex of 12, co-authored 19 publications.
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Papers
Phonon anomalies and range of superconducting energy gaps from infrared studies of YBa2Cu3O7- delta.
TL;DR: The oscillator strengths of the experimentally observed phonons are all stronger than those from a lattice-dynamics model which assumes ionic charges close to the formal ones, especially so for the lowest phonon found at 155 cm/sup /minus/1/ which shows a strength about 15 times higher than theoretically expected.
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Systematic Raman and infrared studies of the superconductor YBa2Cu3O7-x as a function of oxygen concentration (0≦x≦1)
Christian Thomsen,R. Liu,M. Bauer,A. Wittlin,L. Genzel,Manuel Cardona,E. Schönherr,W. Bauhofer,W. König +8 more
TL;DR: In this paper, the variation of Raman and infrared spectra of the new high T c superconductors with oxygen content was studied and it was shown that the Raman peaks associated with Cu-O stretching vibration (502 cm −1, x=0) and Ba-O vibrations (154 cm − 1, x = 0) decrease in frequency when oxygen is removed.
186
Infrared and Raman spectra of the MBa2Cu3O7-type high-Tc superconductors
Manuel Cardona,L. Genzel,R. Liu,A. Wittlin,Hj. Mattausch,Flaviano García-Alvarado,E. García-González +6 more
TL;DR: In this paper, the IR and Raman spectra of superconducting MBa2Cu3O7 (M = Y, Sm, Eu, Gd, Ho) have been measured at several temperatures between 4 and 300 K.
112
Infrared and Raman spectra of the new superconducting cuprate perovskites MBa2Cu3O7, M =Nd, Dy, Er, Tm
Manuel Cardona,R. Liu,Christian Thomsen,M. Bauer,L. Genzel,W. König,A. Wittlin,Ulises Amador,Mauricio Barahona,F. Fernández,C. Otero,R. Saez +11 more
TL;DR: In this paper, the authors reported far-infrared and Raman studies of several ceramic superconducting cuprate perovskites MBa 2 Cu 3 O 7 with M=Nd, Dy, Er, Tm.
92
Temperature dependence of the Raman and infrared phonons of MBa2Cu3O7-δ-type superconductors
A. Wittlin,R. Liu,Manuel Cardona,L. Genzel,W. König,W. Bauhofer,Hj. Mattausch,A. Simon,Flaviano García-Alvarado +8 more
TL;DR: In this article, it was shown that the anomalous temperature dependence of the ∼340 cm-1 Raman phonons of YBa2Cu3O7-δ is common to many materials of the family (M = Y, Sm, Eu, Ho, Gd), and the ir-active Davidov counterpart of this phonon, and another iractive phonon at slightly lower frequency, also exhibit similar effects.
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