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APS » Journals » Phys. Rev. B » Volume 41 » Issue 13
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Phys. Rev. B 41, 8933–8936 (1990)

Infrared and Raman spectroscopy of Nd2CuO4-based superconductors

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M. K. Crawford, G. Burns, G. V. Chandrashekhar, and F. H. Dacol
E.I. du Pont de Nemours & Company, Inc., Central Research & Development Department, Expermintal Station, Wilmington, Delaware 19880-0356
IBM Research Division, Thomas J. Watson Research Center, Yorktown Heights, New York 10598-0218

W. E. Farneth, E. M. McCarron, III, and R. J. Smalley
E.I. du Pont de Nemours & Company, Inc., Central Research & Development Department, Expermintal Station, Wilmington, Delaware 19880-0356

Received 20 November 1989; published in the issue dated 1 May 1990

We report infrared and Raman measurements of phonons in the recently discovered electron-doped superconductors Nd2-x(Ce,Th)xCuO4, and undoped Nd2CuO4. Utilizing data from ceramics and ab-plane single crystals, we have identified all of the expected infrared-active modes (3A2u+4Eu). We have also observed the Raman modes for motion along the c axis in the pure and doped materials. Based on our data and group theory, we assign the observed phonons. Finally, we compare the phonons in this class of materials to those of the related hole superconductors based upon La2CuO4.

© 1990 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.41.8933
DOI:
10.1103/PhysRevB.41.8933
PACS:
63.20.Dj, 74.70.Vy
 
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