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Phys Rev Lett
; 84(23): 5391-4, 2000 Jun 05.
Article
in English
| MEDLINE
| ID: mdl-10990951
ABSTRACT
In good conductors optical phonons are usually screened, and therefore not observed. However, sharp features due to infrared-active modes in the copper-oxygen planes are observed in the optical conductivity of Pr1.85Ce0.15CuO4 and YBa2Cu3O6.95. Oscillator strengths indicate that the screening of these modes is poor or totally absent. These materials are compared with eta-Mo4O11, in which lattice modes appear suddenly below the charge-density wave transition. It is proposed that poor screening in the cuprates originates from fluctuating charge inhomogeneities in the copper-oxygen planes.
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Phys Rev B Condens Matter
; 52(14): 10569-10580, 1995 Oct 01.
Article
in English
| MEDLINE
| ID: mdl-9980110
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Phys Rev B Condens Matter
; 52(6): 4462-4466, 1995 Aug 01.
Article
in English
| MEDLINE
| ID: mdl-9981579
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Phys Rev B Condens Matter
; 50(13): 9688-9691, 1994 Oct 01.
Article
in English
| MEDLINE
| ID: mdl-9975044
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Phys Rev B Condens Matter
; 50(6): 4051-4063, 1994 Aug 01.
Article
in English
| MEDLINE
| ID: mdl-9976685
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Phys Rev B Condens Matter
; 50(6): 4212-4215, 1994 Aug 01.
Article
in English
| MEDLINE
| ID: mdl-9976712
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Phys Rev B Condens Matter
; 49(17): 12165-12169, 1994 May 01.
Article
in English
| MEDLINE
| ID: mdl-10010090
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Phys Rev B Condens Matter
; 49(1): 514-523, 1994 Jan 01.
Article
in English
| MEDLINE
| ID: mdl-10009312
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