Uncovering a Pressure-Tuned Electronic Transition in Bi_1.98Sr_2.06Y_0.68Cu_2O_8+mu using Raman Scattering and X-Ray Diffraction
We report pressure tuned Raman and x-ray diffraction data of Bi1.98Sr2.06Y0.68Cu2O8 revealing a critical pressure at 21 GPa with anomalies in six physical quantities: electronic Raman background, electron-phonon coupling, spectral weight transfer from high to low frequency, density dependent behaviour of phonon and magnon frequencies, and a compressibility change in the c-axis. For the first time in a cuprate, mobile charge carriers, lattice, and magnetism all show anomalies at a distinct critical pressure in the same experimental setting. Furthermore, the Raman spectral changes are similar to that seen traversing the superconducting dome with doping, suggesting that the critical pressure at 21 GPa is related to the much discussed critical point at optimal doping.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 975788
- Report Number(s):
- SLAC-REPRINT-2010-072; TRN: US1006786
- Journal Information:
- Submitted to Physical Review Letters, Journal Name: Submitted to Physical Review Letters
- Country of Publication:
- United States
- Language:
- English
Similar Records
Two-magnon Raman scattering in dielectric and superconducting YBa{sub 2}Cu{sub 3}O{sub 6+x} crystals
Absolute Raman efficiencies as a tool to investigate HTc cuprates