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Raman active collective mode in underdoped cuprates |
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| Authors: | Girsh Blumberg and Miles V. Klein |
| Affiliation: | a Bell Laboratories, Lucent Technologies, 700 Mountain Ave., Murray Hill, NJ 07974, USA b University of Illinois at Urbana-Champaign, 1110 W. Green St., Urbana, IL 61801-3080, USA |
| Abstract: | We report experimental observation of Bardasis–Schrieffer-type s-symmetry collective mode in the d-wave high Tc superconductors. The mode persists above Tc in the pseudogap phase of the underdoped superconductors — direct spectroscopic evidence of the correlations in the particle–particle channel above Tc. |
| Keywords: | Collective modes Pseudogap Raman scattering |
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