Measurement of c-axis Optical Absorptivity of La{sub1.87}Sr{sub 0.13}CuO{sub 4}

Conference · Sun Dec 31 23:00:00 EST 1995

OSTI ID:6369

Birmingham, J T ^[1]; Cardona, M; Duijn, V H.M.; Grannan, S M; Henn, R; Kircher, J; Menovsky, A A; Richards, P L; Wittlin, A

---

1. LBNL Library

We have directly measured the c-axis optical absorptivity of a large single crystal of La{sub 1.87}Sr{sub O.13}Cu0{sub 4} between 9 and 80 cm{sup -l} at 2 K using Fourier transform spectroscopy and an absorbed power technique. We see an absorptivity onset at 41 cm{sup -l}, which is 2-3 cm{sup -l} higher than that measured at 6 K with reflectance on the same sample, suggesting that a significant fraction of the electrons remain unpaired at 6 K. The absorption increases with frequency below the onset increasing from 0.3% at 9 cm{sup -l} to 8% at 40 cm{sup -l}. Our data are particularly significant at frequencies below the plasma edge, for which the reflectance is close to unity.

• Research Organization: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: DOE
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6369
• Report Number(s): LBL--38139; ON: DE00006369
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Copper Oxides
Frequency Dependence
Lanthanum Oxides
Opacity
Strontium Oxides
Temperature Range 0000-0013 K