Temperature dependence of the Raman spectra of Tl2Ba2CaCu2O8

Chrzanowski, J.; Fortier, N.; Cragg, A.; Burany, S.; Heinrich, B.; Irwin, J. C.

doi:10.1016/0921-4534(91)92127-w

Cited by 6 publications

(1 citation statement)

References 9 publications

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“…The distance from the Cu atom to the apical oxygen O2 atom has a minimum near the critical temperature, and below T c it is abruptly increased. This behaviour might be related to that of the vibration frequency of the O2 atom, which hardens as temperature is lowered to T c and then at T c begins to soften (Chrzanowski et al, 1991). The TlÐO2 and TlÐO3 distances show a clear tendency for a maximum near T c .…”

Section: Tl 2 Ba 2 Cacu 2 Omentioning

confidence: 99%

Superconducting Single Crystals of Tl2Ba2CaCu2O8 and YBa2Cu4O8: Crystal Structures in the Vicinity of Tc

Molchanov¹,

Simonov²

1998

Acta Cryst Sect A

491

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The structures of superconducting Tl 2 Ba 2 CaCu 2 O 8 (T c $ 110 K) and YBa 2 Cu 4 O 8 (T c $ 70 K) were investigated by single-crystal X-ray diffraction techniques in a wide temperature range. Some of the structure parameters show anomalous behaviour in the vicinity of the critical temperature. The most pronounced structural change is the shift of the apical O atoms in CuO 5 pyramids towards the CuO 2 planes, indicating charge redistribution near T c . This behaviour of the apical O atoms seems to be the common structural feature of hole-doped high-T c superconductors. Another effect of charge redistribution at T c concerns a very small decrease of in-plane CuÐO distances and/or OÐO distances in CuO 5 pyramids. Both effects represent an averaged structure response to charge (hole) redistribution upon the phase transition to the superconducting state.

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Section: Tl 2 Ba 2 Cacu 2 Omentioning

confidence: 99%