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
DOIs
Publication statusPublished - Dec 1997

Keywords

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

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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