Positron annihilation in [Fe(ptz)6](BF4)2 and [Zn(ptz)6](BF4)2 single crystals studied with one-dimensional angular correlation of annihilation radiation

Haruo Saito, Yasuyoshi Nagai, Toshio Hyodo, Károly Süvegh, Attila Vértes

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4 Citations (Scopus)

Abstract

One-dimensional angular correlation of positron annihilation radiation spectra (ID-ACAR) from single crystals of [Fe(ptz)6] (BF4)2 and [Zn(ptz)6] (BF4)2 along the c-axis are measured in the temperature range between 23 K and 295 K. A remarkable temperature dependence of the ACAR spectra for [Fe(ptz)6](BF4)2 around the spin-crossover temperature (130K) is observed and interpreted as being due to spin-conversion of positronium atoms. This observation suggests that the positronium atoms are localized in the vicinity of the central Fe(II) ion of [Fe(ptz)6] (BF4)2. In contrast, ACAR spectra for [Zn(ptz)6](BF4)2, which shows no spin-crossover, are almost independent of temperature. No evidence for the formation of delocalized free positronium atoms is found in either sample.

Original languageEnglish
Pages (from-to)111-112
Number of pages2
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume37
Issue number1
DOIs
Publication statusPublished - 1998 Jan
Externally publishedYes

Keywords

  • ACAR
  • Positronium
  • Spin-conversion
  • Spin-crossover
  • [Fe(ptz)](BF)
  • [Zn(ptz)](BF)

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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