Fast muon spin relaxation in ferromagnetism of potassium clusters in zeolite A

Takehito Nakano; Jun Matsumoto; Truong Cong Duan; Isao Watanabe; Takao Suzuki; Takayuki Kawamata; Alex Amato; Francis L. Pratt; Yasuo Nozue

doi:10.1016/j.physb.2008.11.120

Fast muon spin relaxation in ferromagnetism of potassium clusters in zeolite A

Takehito Nakano, Jun Matsumoto, Truong Cong Duan, Isao Watanabe, Takao Suzuki, Takayuki Kawamata, Alex Amato, Francis L. Pratt, Yasuo Nozue

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

6 Citations (Scopus)

Abstract

Potassium clusters arrayed in zeolite A are known to show ferromagnetic properties at low temperatures. A remarkable decrease in the initial asymmetry was observed previously below the Curie temperature in zero-field μ SR by using pulsed muons. In the present work by using dc muons, we clearly observed the fast decay component which was assigned to the decrease in the initial asymmetry in the previous pulsed muon experiment. The relaxation rate amounts to ≃ 20 μ s^{- 1} which corresponds to ≃ 200 Oe in the random static field. This value cannot be explained by the ordinary dipole field, but by the Fermi-contact interaction with electrons in K clusters. The fast decay is easily quenched by applying a weak longitudinal field of ≃ 10 Oe. The low field decoupling of the fast decay component can be explained by the magnetization by the spin-canting mechanism of antiferromagnet under the assumption that some muons stop near the oxygen in 8-membered ring of zeolite framework.

Original language	English
Pages (from-to)	630-633
Number of pages	4
Journal	Physica B: Condensed Matter
Volume	404
Issue number	5-7
DOIs	https://doi.org/10.1016/j.physb.2008.11.120
Publication status	Published - 2009 Apr 15
Externally published	Yes

Keywords

Alkali-metal cluster
Fermi-contact interaction
Ferromagnetism
Zeolite
μ SR

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1016/j.physb.2008.11.120

Cite this

@article{5ae541f55a614cb2aacf5afa615edf22,

title = "Fast muon spin relaxation in ferromagnetism of potassium clusters in zeolite A",

abstract = "Potassium clusters arrayed in zeolite A are known to show ferromagnetic properties at low temperatures. A remarkable decrease in the initial asymmetry was observed previously below the Curie temperature in zero-field μ SR by using pulsed muons. In the present work by using dc muons, we clearly observed the fast decay component which was assigned to the decrease in the initial asymmetry in the previous pulsed muon experiment. The relaxation rate amounts to ≃ 20 μ s- 1 which corresponds to ≃ 200 Oe in the random static field. This value cannot be explained by the ordinary dipole field, but by the Fermi-contact interaction with electrons in K clusters. The fast decay is easily quenched by applying a weak longitudinal field of ≃ 10 Oe. The low field decoupling of the fast decay component can be explained by the magnetization by the spin-canting mechanism of antiferromagnet under the assumption that some muons stop near the oxygen in 8-membered ring of zeolite framework.",

keywords = "Alkali-metal cluster, Fermi-contact interaction, Ferromagnetism, Zeolite, μ SR",

author = "Takehito Nakano and Jun Matsumoto and {Cong Duan}, Truong and Isao Watanabe and Takao Suzuki and Takayuki Kawamata and Alex Amato and Pratt, {Francis L.} and Yasuo Nozue",

note = "Funding Information: This work was partially supported by Grant-in-Aid for Creative Scientific Research (No. 15GS0213), that for Scientific Research on Priority Areas (No. 19051009) and that for Young Scientists (B) (No. 20710077) from MEXT Japan, and also by the 21st Century COE Program “Towards a New Basic Science: Depth and Synthesis” and Global COE Program “Core Research and Engineering of Advanced Materials-Interdisciplinary Education Center for Materials Science”, MEXT Japan. We also thank the support by the KEK-MSL Inter-University Program for Oversea Muon Facilities.",

year = "2009",

month = apr,

day = "15",

doi = "10.1016/j.physb.2008.11.120",

language = "English",

volume = "404",

pages = "630--633",

journal = "Physica B: Condensed Matter",

issn = "0921-4526",

publisher = "Elsevier",

number = "5-7",

}

TY - JOUR

T1 - Fast muon spin relaxation in ferromagnetism of potassium clusters in zeolite A

AU - Nakano, Takehito

AU - Matsumoto, Jun

AU - Cong Duan, Truong

AU - Watanabe, Isao

AU - Suzuki, Takao

AU - Kawamata, Takayuki

AU - Amato, Alex

AU - Pratt, Francis L.

AU - Nozue, Yasuo

N1 - Funding Information: This work was partially supported by Grant-in-Aid for Creative Scientific Research (No. 15GS0213), that for Scientific Research on Priority Areas (No. 19051009) and that for Young Scientists (B) (No. 20710077) from MEXT Japan, and also by the 21st Century COE Program “Towards a New Basic Science: Depth and Synthesis” and Global COE Program “Core Research and Engineering of Advanced Materials-Interdisciplinary Education Center for Materials Science”, MEXT Japan. We also thank the support by the KEK-MSL Inter-University Program for Oversea Muon Facilities.

PY - 2009/4/15

Y1 - 2009/4/15

N2 - Potassium clusters arrayed in zeolite A are known to show ferromagnetic properties at low temperatures. A remarkable decrease in the initial asymmetry was observed previously below the Curie temperature in zero-field μ SR by using pulsed muons. In the present work by using dc muons, we clearly observed the fast decay component which was assigned to the decrease in the initial asymmetry in the previous pulsed muon experiment. The relaxation rate amounts to ≃ 20 μ s- 1 which corresponds to ≃ 200 Oe in the random static field. This value cannot be explained by the ordinary dipole field, but by the Fermi-contact interaction with electrons in K clusters. The fast decay is easily quenched by applying a weak longitudinal field of ≃ 10 Oe. The low field decoupling of the fast decay component can be explained by the magnetization by the spin-canting mechanism of antiferromagnet under the assumption that some muons stop near the oxygen in 8-membered ring of zeolite framework.

AB - Potassium clusters arrayed in zeolite A are known to show ferromagnetic properties at low temperatures. A remarkable decrease in the initial asymmetry was observed previously below the Curie temperature in zero-field μ SR by using pulsed muons. In the present work by using dc muons, we clearly observed the fast decay component which was assigned to the decrease in the initial asymmetry in the previous pulsed muon experiment. The relaxation rate amounts to ≃ 20 μ s- 1 which corresponds to ≃ 200 Oe in the random static field. This value cannot be explained by the ordinary dipole field, but by the Fermi-contact interaction with electrons in K clusters. The fast decay is easily quenched by applying a weak longitudinal field of ≃ 10 Oe. The low field decoupling of the fast decay component can be explained by the magnetization by the spin-canting mechanism of antiferromagnet under the assumption that some muons stop near the oxygen in 8-membered ring of zeolite framework.

KW - Alkali-metal cluster

KW - Fermi-contact interaction

KW - Ferromagnetism

KW - Zeolite

KW - μ SR

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JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

IS - 5-7

ER -

Fast muon spin relaxation in ferromagnetism of potassium clusters in zeolite A

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