Lattice vibrations in high Tc Bi2(Sr1−xCax)2CuO6+β

doi:10.1016/0038-1098(90)90937-7

Solid State Communications

Volume 74, Issue 8, May 1990, Pages 797-799

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Abstract

The long wavelenght optical phonons in Bi₂(Sr_1−xCa_x)₂CuO_6+β are calculated employing a central force model and assuming a tetragonal structure. The interactions between atoms within a radius of 5 Å have been taken into account employing known bond stretching force constants. A comparison is made between the calculated phonons and the Raman and infrared spectral features.

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Partially replacing bismuth by lead in the high-T_c superconductor Bi₂Sr₂CuO_6+δ is known to induce an orthorhombic lattice distortion and to suppress the incommensurate structural modulation. The Raman spectra of Bi_2.1−xPb_xSr_{1.9CuO_6+δ} for a series of samples with 0⩽x⩽0.5 have been studied at room temperature. The data yield evidence in support of the assignment of the various peaks to vibrational modes of lattice. A lead-induced vibrational peak at 520 cm⁻¹, which emerges in the more heavily doped samples, is attributed to the vibration of oxygen in O(2) sites bonded to lead. In the modulated phase, doubling of the peaks of the unmodulated structure is observed.
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Lattice vibrations in high Tc Bi2(Sr1−xCax)2CuO6+β

Abstract

Solid State Commun.

Z. Phys.

Phys. Today

Jpn. J. Appl. Phys.

Lattice vibrations in high T_c Bi₂(Sr_1−xCa_x)₂CuO_6+β