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

doi:10.1143/JJAP.37.111

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

IMR - Materials Design Division

Research output: Contribution to journal › Article › peer-review

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 language	English
Pages (from-to)	111-112
Number of pages	2
Journal	Japanese Journal of Applied Physics
Volume	37
Issue number	1
DOIs	https://doi.org/10.1143/JJAP.37.111
Publication status	Published - 1998 Jan

Keywords

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

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10.1143/JJAP.37.111

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title = "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",

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.",

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author = "Haruo Saito and Yasuyoshi Nagai and Toshio Hyodo and K{\'a}roly S{\"u}vegh and Attila V{\'e}rtes",

year = "1998",

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doi = "10.1143/JJAP.37.111",

language = "English",

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AU - Saito, Haruo

AU - Nagai, Yasuyoshi

AU - Hyodo, Toshio

AU - Süvegh, Károly

AU - Vértes, Attila

PY - 1998/1

Y1 - 1998/1

N2 - 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.

AB - 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.

KW - ACAR

KW - Positronium

KW - Spin-conversion

KW - Spin-crossover

KW - [Fe(ptz)](BF)

KW - [Zn(ptz)](BF)

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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

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