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Infrared spectra and lattice vibrations of the spin-chain compound LiCuVO 4 (2001)

Gorshunov, B. ; Haas, P. ; Dressel, M. ; [weitere]

Springer

The European physical journal 23 (2001), S. 427-435

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ISSN: 1434-6036

Schlagwort(e): PACS. 75.50.Ee Antiferromagnetics – 63.20.Dj Phonon states and bands, normal modes, and phonon dispersion

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract: The infrared spectra of the one-dimensional antiferromagnet LiCuVO4 are measured in the frequency range from 10 cm-1 to 10 000 cm-1 and at temperatures from 2 K to 300 K, for the electric field vector E of the radiation polarized either along the a- or along the b-crystallographic directions. For each polarization six infrared active phonon modes are observed in accordance with factor group analysis of the crystal structure of LiCuVO4. The theoretical group analysis of the possible spinel low-symmetry phases is performed within the framework of Landau's theory of phase transitions. The parameters of several phonon lines show noticeable anomalies around 150 K where the magnetic correlations appear in the copper chains, which may indicate a finite interaction between the phonon and the magnon subsystems in LiCuVO4.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s100510170033

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Digitale Medien

Optical measurements of the superconducting gap in MgB 2 (2001)

Gorshunov, B. ; Kuntscher, C.A. ; Haas, P. ; [weitere]

Springer

The European physical journal 21 (2001), S. 159-161

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ISSN: 1434-6036

Schlagwort(e): PACS. 74.25.Gz Optical properties – 74.70.Ad Metals; alloys and binary compounds (including A15, Laves phases, etc.)

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract: Far-infrared reflectivity studies on the polycrystalline intermetallic compound MgB2 with a superconducting transition temperature T c = 39 K were performed at temperatures 20 K to 300 K. We observe a significant raise of the superconducting-to-normal state reflectivity ratio below 70 cm -1 , with a maximum at about 25-30 cm -1 , which gives a lower estimate of the superconducting gap of 2Δ(0) ≈ 3-4 meV.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s100510170191

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