New modulation structures observed in Bi<sub>2.13</sub>Sr<sub>1.87</sub>CuO<sub>6+</sub> superconductors
S F Cui; C R Li; Z H Mai; J W Xiong; Z X Zhao; Y T Wang; P D Hatton
Журнал:
Superconductor Science and Technology
Дата:
1999-09-01
Аннотация:
A new two-dimensional structure modulation along c- and b-axes has been discovered in superconducting single crystals of Bi<sub>2.13</sub>Sr<sub>1.87</sub>CuO<sub>6+</sub> (Bi2201) by x-ray scattering. Such modulation structure does not exist in non-superconducting Bi2201 single crystals, but instead lattice distortions are observed in the a-b-plane. This phenomenon may indicate that both strain relaxation and charge modulation in the a-b-plane are important to the occurrence of superconductivity in the copper oxides.
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