Paramagnetic centers in ZnWO4

Tm single crystals

A. Watterich, L. A. Kappers, O. R. Gilliam

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Paramagnetic centers in thulium-doped ZnWO4 single crystals have been characterized by ESR spectroscopy. Most of the dopant is determined to be in the crystal as Tm3+ substitutional for Zn2+ and shows no ESR spectrum, however, a low concentration of Tm2+ centers with the 4f13 electron configuration and S = 1/2 is detected in C1 symmetry. The intensity of this center is greatly enhanced by a 366-nm UV illumination at 77 K via electron capture. The low symmetry is attributed to an associated defect, probably a Zn vacancy that had contributed to local charge compensation of the original Tm3+ ion, where the vacancy remains at the Tm ion even after the electron capture at low temperature. This center is denoted as the Tm2+-VZn center. Also observed by ESR after UV illumination at 77 K are some paramagnetic hole-type defects. One of these is characterized as an O- center near a Tm3+ zinc-vacancy pair and is denoted as the O--VZn-Tm3+ center.

Original languageEnglish
Pages (from-to)683-688
Number of pages6
JournalSolid State Communications
Volume104
Issue number11
Publication statusPublished - Dec 1997

Fingerprint

Vacancies
Paramagnetic resonance
Single crystals
Electrons
single crystals
Thulium
Lighting
Ions
Defects
Zinc
electron capture
Doping (additives)
Spectroscopy
illumination
Crystals
thulium
defects
symmetry
doped crystals
low concentrations

Keywords

  • A. insulators
  • C. point defects
  • D. radiation effects
  • F. electron paramagnetic resonance

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Watterich, A., Kappers, L. A., & Gilliam, O. R. (1997). Paramagnetic centers in ZnWO4: Tm single crystals. Solid State Communications, 104(11), 683-688.

Paramagnetic centers in ZnWO4 : Tm single crystals. / Watterich, A.; Kappers, L. A.; Gilliam, O. R.

In: Solid State Communications, Vol. 104, No. 11, 12.1997, p. 683-688.

Research output: Contribution to journalArticle

Watterich, A, Kappers, LA & Gilliam, OR 1997, 'Paramagnetic centers in ZnWO4: Tm single crystals', Solid State Communications, vol. 104, no. 11, pp. 683-688.
Watterich, A. ; Kappers, L. A. ; Gilliam, O. R. / Paramagnetic centers in ZnWO4 : Tm single crystals. In: Solid State Communications. 1997 ; Vol. 104, No. 11. pp. 683-688.
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