Comparative studies of microwave absorption in the singlet paramagnets HoVO{sub 4} and HoBa{sub 2}Cu{sub 3}O{sub x} in strong pulsed magnetic fields

Journal Article · Sat Mar 15 00:00:00 EDT 2008 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S106377610803014X· OSTI ID:21075587

Snegirev, V V ^[1]; Goaran, M ^[2]; Kozeeva, L P; Kameneva, M Yu ^[3]

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1. Moscow State University (Russian Federation)
2. Laboratoire National des Champs Magnetiques Pulses (France)
3. Russian Academy of Sciences, Nikolaev Institute of Inorganic Chemistry, Siberian Branch (Russian Federation)

Microwave absorption in the tetragonal singlet paramagnets HoVO{sub 4} (zircon structure) and HoBa{sub 2}Cu{sub 3}O{sub x} (x {approx} 6, layered perovskite structure) is studied and compared in pulsed magnetic fields up to 40 T at low temperatures. These paramagnets are characterized by a singlet-doublet scheme of the low-lying levels of the Ho{sup 3+} ion in a crystal field. In a magnetic field directed along the tetragonal axis, HoVO{sub 4} exhibits resonance absorption lines at wavelengths of 871, 406, and 305 {mu}m, which correspond to electron transitions between the low-lying levels of the Ho{sup 3+} ion in the crystal field. The positions and intensities of these absorption lines in HoVO{sub 4} are well described in terms of the crystal-field formalism with the well-known interaction parameters. The absorption spectra of HoBa{sub 2}Cu{sub 3}O{sub x} at a wavelength of 871 {mu}m exhibit broad resonance absorption lines against the background of strong nonresonance absorption. The effects of low-symmetry (orthorhombic, monoclinic) crystal-field components, the deviation of a magnetic field from a symmetry axis, and various pair interactions on the absorption spectra of the HoVO{sub 4} and HoBa{sub 2}Cu{sub 3}O{sub x} crystals are discussed.

• OSTI ID: 21075587
• Journal Information: Journal of Experimental and Theoretical Physics, Vol. 106, Issue 3; Other Information: DOI: 10.1134/S106377610803014X; Copyright (c) 2008 Pleiades Publishing, Ltd; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTRA
BARIUM COMPOUNDS
CRYSTAL FIELD
CRYSTALS
CUPRATES
ELECTRONS
HOLMIUM COMPOUNDS
HOLMIUM IONS
MAGNETIC FIELDS
MICROWAVE RADIATION
MONOCLINIC LATTICES
ORTHORHOMBIC LATTICES
PAIRING INTERACTIONS
RESONANCE ABSORPTION
SYMMETRY
TEMPERATURE RANGE 0013-0065 K
VANADATES