Iron mixed-valence compounds, BaSm(Cu0.5+xFe0.5-x)2O5+δ. II: the Fe2.5+ state and magnetic properties

J. Lindén; J. Nakamura; T. Pietari; T. Taniyama; M. Karppinen; H. Yamauchi

doi:10.1016/S0921-4534(00)00214-8

Iron mixed-valence compounds, BaSm(Cu_0.5+xFe_0.5-x)₂O_5+δ. II: the Fe^2.5+ state and magnetic properties

J. Lindén^*, J. Nakamura, T. Pietari, T. Taniyama, M. Karppinen, H. Yamauchi

^*Tämän työn vastaava kirjoittaja

Physics

Tutkimustuotos: Lehtiartikkeli › Konferenssiartikkeli › Tieteellinen › vertaisarvioitu

Abstrakti

Recently, a fluctuating mixed-valence state formally denoted as Fe^2.5+ was observed in BaSmFe₂O_5+δ double-perovskite samples, having δ < 0.5 [J. Linden, P. Karen, A. Kjekshus, J. Miettinen, T. Pietari, M. Karppinen, Phys. Rev. B 60 (1999) 15251.]. Upon cooling such samples to the Verwey-type transition temperature (T_V ≈ 200 K), a mixing-separation transition of the valence state occurs. In order to study in detail the formation of the mixed-valence state BaSm(Cu_0.5+xFe_0.5-x)₂O_5+δ, samples with a certain amount of Fe (0-10% and 40-50%) replaced by Cu have been characterized by ⁵⁷Fe Mossbauer spectroscopy and magnetization measurements. All samples were found to be magnetically ordered at room temperature. The amount of Fe entering the Fe^2.5+ state decreased rapidly as the Cu doping level was increased, as judged by the Mossbauer spectra. Increasing the Cu concentration also led to an increase of T_V.

Alkuperäiskieli	Englanti
Sivut	126-131
Sivumäärä	6
Julkaisu	Physica C: Superconductivity and its Applications
Vuosikerta	338
Numero	1
DOI - pysyväislinkit	https://doi.org/10.1016/S0921-4534(00)00214-8
Tila	Julkaistu - 1 elok. 2000
OKM-julkaisutyyppi	A4 Artikkeli konferenssijulkaisuussa
Tapahtuma	International Discussion Meeting on Chemistry Approaches to High-Tc Superconductive Materials / 5th International Workshop on Chemical Designing and Processing of High-Tc Superconductors (Chem-HTSC-V) - Yokohama, Jpn Kesto: 15 lokak. 1999 → 16 lokak. 1999

Pääsy asiakirjaan

10.1016/S0921-4534(00)00214-8

Muut tiedostot ja linkit

Link to publication in Scopus

Viittausmuodot

@article{a896afbecff64cb4880b54e0357ef195,

title = "Iron mixed-valence compounds, BaSm(Cu0.5+xFe0.5-x)2O5+δ. II: the Fe2.5+ state and magnetic properties",

abstract = "Recently, a fluctuating mixed-valence state formally denoted as Fe2.5+ was observed in BaSmFe2O5+δ double-perovskite samples, having δ < 0.5 [J. Linden, P. Karen, A. Kjekshus, J. Miettinen, T. Pietari, M. Karppinen, Phys. Rev. B 60 (1999) 15251.]. Upon cooling such samples to the Verwey-type transition temperature (TV ≈ 200 K), a mixing-separation transition of the valence state occurs. In order to study in detail the formation of the mixed-valence state BaSm(Cu0.5+xFe0.5-x)2O5+δ, samples with a certain amount of Fe (0-10% and 40-50%) replaced by Cu have been characterized by 57Fe Mossbauer spectroscopy and magnetization measurements. All samples were found to be magnetically ordered at room temperature. The amount of Fe entering the Fe2.5+ state decreased rapidly as the Cu doping level was increased, as judged by the Mossbauer spectra. Increasing the Cu concentration also led to an increase of TV.",

author = "J. Lind{\'e}n and J. Nakamura and T. Pietari and T. Taniyama and M. Karppinen and H. Yamauchi",

year = "2000",

month = aug,

day = "1",

doi = "10.1016/S0921-4534(00)00214-8",

language = "English",

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pages = "126--131",

journal = "Physica C: Superconductivity and its Applications",

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publisher = "Elsevier",

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note = "International Discussion Meeting on Chemistry Approaches to High-Tc Superconductive Materials / 5th International Workshop on Chemical Designing and Processing of High-Tc Superconductors (Chem-HTSC-V) ; Conference date: 15-10-1999 Through 16-10-1999",

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TY - JOUR

T1 - Iron mixed-valence compounds, BaSm(Cu0.5+xFe0.5-x)2O5+δ. II

T2 - International Discussion Meeting on Chemistry Approaches to High-Tc Superconductive Materials / 5th International Workshop on Chemical Designing and Processing of High-Tc Superconductors (Chem-HTSC-V)

AU - Lindén, J.

AU - Nakamura, J.

AU - Pietari, T.

AU - Taniyama, T.

AU - Karppinen, M.

AU - Yamauchi, H.

PY - 2000/8/1

Y1 - 2000/8/1

N2 - Recently, a fluctuating mixed-valence state formally denoted as Fe2.5+ was observed in BaSmFe2O5+δ double-perovskite samples, having δ < 0.5 [J. Linden, P. Karen, A. Kjekshus, J. Miettinen, T. Pietari, M. Karppinen, Phys. Rev. B 60 (1999) 15251.]. Upon cooling such samples to the Verwey-type transition temperature (TV ≈ 200 K), a mixing-separation transition of the valence state occurs. In order to study in detail the formation of the mixed-valence state BaSm(Cu0.5+xFe0.5-x)2O5+δ, samples with a certain amount of Fe (0-10% and 40-50%) replaced by Cu have been characterized by 57Fe Mossbauer spectroscopy and magnetization measurements. All samples were found to be magnetically ordered at room temperature. The amount of Fe entering the Fe2.5+ state decreased rapidly as the Cu doping level was increased, as judged by the Mossbauer spectra. Increasing the Cu concentration also led to an increase of TV.

AB - Recently, a fluctuating mixed-valence state formally denoted as Fe2.5+ was observed in BaSmFe2O5+δ double-perovskite samples, having δ < 0.5 [J. Linden, P. Karen, A. Kjekshus, J. Miettinen, T. Pietari, M. Karppinen, Phys. Rev. B 60 (1999) 15251.]. Upon cooling such samples to the Verwey-type transition temperature (TV ≈ 200 K), a mixing-separation transition of the valence state occurs. In order to study in detail the formation of the mixed-valence state BaSm(Cu0.5+xFe0.5-x)2O5+δ, samples with a certain amount of Fe (0-10% and 40-50%) replaced by Cu have been characterized by 57Fe Mossbauer spectroscopy and magnetization measurements. All samples were found to be magnetically ordered at room temperature. The amount of Fe entering the Fe2.5+ state decreased rapidly as the Cu doping level was increased, as judged by the Mossbauer spectra. Increasing the Cu concentration also led to an increase of TV.

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U2 - 10.1016/S0921-4534(00)00214-8

DO - 10.1016/S0921-4534(00)00214-8

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SN - 0921-4534

VL - 338

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EP - 131

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

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Y2 - 15 October 1999 through 16 October 1999

ER -