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The ab-plane reflectance of a Pr2CuO4 single crystal has been measured over awide frequency range at a variety of temperatures, and the optical propertiesdetermined from a Kramers-Kronig analysis. Above ~ 250 K, the low frequencyconductivity increases quickly with temperature; the resistivity follows theform e^(E_a/k_BT), where E_a ~ 0.17 eV is much less than the inferred opticalgap of ~ 1.2 eV. Transport measurements show that at low temperature theresistivity deviates from activated behavior and follows the forme^[(T_0/T)^1/4], indicating that the dc transport in this material is due tovariable-range hopping between localized states in the gap. The fourinfrared-active Eu modes dominate the infrared optical properties. Below ~ 200K, a striking new feature appears near the low-frequency Eu mode, and there isadditional new fine structure at high frequency. A normal coordinate analysishas been performed and the detailed nature of the zone-center vibrationsdetermined. Only the low-frequency Eu mode has a significant Pr-Cu interaction.Several possible mechanisms related to the antiferromagnetism in this materialare proposed to explain the sudden appearance of this and other new spectralfeatures at low temperature.Comment: 11 pages, 7 embedded EPS figures, REVTeX

physical review. b, condensed matter

Infrared optical properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Pr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Infrared optical properties ofPr2CuO4