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Phys. Rev. Lett. 100, 217003 (2008) [4 pages]

Uncovering a Pressure-Tuned Electronic Transition in Bi1.98Sr2.06Y0.68Cu2O8+δ using Raman Scattering and X-Ray Diffraction

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T. Cuk1, V. V. Struzhkin2, T. P. Devereaux3, A. F. Goncharov2, C. A. Kendziora4, H. Eisaki5, H.-K. Mao2, and Z.-X. Shen1
1Departments of Physics, Applied Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA
2Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C. 20015, USA
3Department of Physics University of Waterloo Waterloo, Ontario Canada, N2L 3G1
4Naval Research Laboratory, Code 6365, Washington, D.C. 20375, USA
5Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology, 1-1-1 Central 2, Umezono, Tsukuba, Ibaraki, 305-8568, Japan

Received 10 January 2008; published 30 May 2008

We report pressure-tuned Raman and x-ray diffraction data of Bi1.98.Sr2.06Y0.68Cu2O8+δ revealing a critical pressure at 21 GPa with anomalies in electronic Raman background, electron-phonon coupling λ, spectral weight transfer, density dependent behavior of phonons and magnons, 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 spectral changes suggest that the critical pressure at 21 GPa is related to the critical point at optimal doping.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.217003
DOI:
10.1103/PhysRevLett.100.217003
PACS:
74.72.Hs, 74.25.Gz, 74.62.Fj, 78.30.−j
 
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