Structural and phonon anomalies in the superconducting Bi2Sr2CaCu2O8+σ with varying doping level at high pressures
[1];
[3];
- Fudan Univ., Shanghai (China); Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
- Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Institute for Nuclear Research RAS, Moscow (Russian Federation); A. V. Shubnikov Institute of Crystallography, Moscow (Russian Federation); Immanuel Kant Baltic Federal University, Kaliningrad (Russian Federation)
- A. V. Shubnikov Institute of Crystallography, Moscow (Russian Federation)
- Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Shanghai Advanced Research in Physical Sciences (SHARPS) (China)
- Univ. of Houston, TX (United States)
Here we examined the effect of the lattice compression on the crystal structure of the Bi2Sr2CaCu2O8+σ superconductor with nearly optimally doped and overdoped composition using X-ray diffraction technique. Our studies show that at high pressures (up to 30 GPa ) the doping level does not affect the crystal structure of this superconductor. Along with this, structural anomalies in ratio appear at a pressure that corresponds to that at which Tc begins to decrease. This fact indicates a close connection between the observed anomalies and superconductivity. We also studied the effect of doping and pressure on the Tc(P) and on the Raman active lattice modes of the Bi2Sr2CaCu2O8+σ superconductors. We find universal suppression of the Tc by the pressure starting from the critical pressure Pc in the range from 9 to 16 GPa, depending on the doping level of the Bi2Sr2CaCu2O8+σ samples. Concomitantly, we observe phonon anomalies around 10 to 20 GPa, which indicate possible pressure-induced charge redistribution in BiO layers. These newly detected anomalies may be related to the changes in the electronic structure which compete with the superconductivity.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Key Research and Development Program of China
- Grant/Contract Number:
- SC0012704
- OSTI ID:
- 2429535
- Report Number(s):
- BNL--225887-2024-JAAM
- Journal Information:
- Europhysics Letters, Journal Name: Europhysics Letters Journal Issue: 5 Vol. 146; ISSN 0295-5075
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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