Enhancement of the curie temperature due to the coupling between Fe itinerant electrons and Dy localized electrons in DyFe2Zn20

Yosikazu Isikawa; Toshio Mizushima; Souta Miyamoto; Keigou Kumagai; Mako Nakahara; Hiroaki Okuyama; Takashi Tayama; Tomohiko Kuwai; Pascal Lejay

doi:10.3938/jkps.63.644

Enhancement of the curie temperature due to the coupling between Fe itinerant electrons and Dy localized electrons in DyFe₂Zn₂₀

Yosikazu Isikawa^*, Toshio Mizushima, Souta Miyamoto, Keigou Kumagai, Mako Nakahara, Hiroaki Okuyama, Takashi Tayama, Tomohiko Kuwai, Pascal Lejay

^*Corresponding author for this work

Department of Physics

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

12 Scopus citations

Abstract

The temperature dependences of the magnetization and the specific heat of the ferromagnetic compound DyFe₂Zn₂₀ have been measured in detail in various magnetic fields. We have observed anomalous magnetic behaviors, i.e., a strong anisotropy at 2 K, the disappearance of this anisotropy at temperatures between approximately 30 K and T _c, and an anomalous behavior of the specific heat in magnetic fields at temperatures near 20 K. These anomalous phenomena have been analyzed based on the strong exchange interaction between the Fe itinerant electrons and the Dy localized electrons, as well as the crystalline electric field, the Zeeman energy, and an usual exchange interaction between two Dy atoms. The higher T _c of DyFe₂Zn₂₀ compared with that of DyRu₂Zn₂₀ is caused by this exchange interaction between the Fe and the Dy atoms.

Original language	English
Pages (from-to)	644-649
Number of pages	6
Journal	Journal of the Korean Physical Society
Volume	63
Issue number	3
DOIs	https://doi.org/10.3938/jkps.63.644
State	Published - 2013/08

Keywords

CEF
DyFeZn
Ferrimagnet
Itinerant electrons
Magnetic anisotropy
Rare earth
Single crystal

ASJC Scopus subject areas

General Physics and Astronomy

Access to Document

10.3938/jkps.63.644

Cite this

@article{c809150a03bc436982d36dd2ffbd8c69,

title = "Enhancement of the curie temperature due to the coupling between Fe itinerant electrons and Dy localized electrons in DyFe2Zn20",

abstract = "The temperature dependences of the magnetization and the specific heat of the ferromagnetic compound DyFe2Zn20 have been measured in detail in various magnetic fields. We have observed anomalous magnetic behaviors, i.e., a strong anisotropy at 2 K, the disappearance of this anisotropy at temperatures between approximately 30 K and T c, and an anomalous behavior of the specific heat in magnetic fields at temperatures near 20 K. These anomalous phenomena have been analyzed based on the strong exchange interaction between the Fe itinerant electrons and the Dy localized electrons, as well as the crystalline electric field, the Zeeman energy, and an usual exchange interaction between two Dy atoms. The higher T c of DyFe2Zn20 compared with that of DyRu2Zn20 is caused by this exchange interaction between the Fe and the Dy atoms.",

keywords = "CEF, DyFeZn, Ferrimagnet, Itinerant electrons, Magnetic anisotropy, Rare earth, Single crystal",

author = "Yosikazu Isikawa and Toshio Mizushima and Souta Miyamoto and Keigou Kumagai and Mako Nakahara and Hiroaki Okuyama and Takashi Tayama and Tomohiko Kuwai and Pascal Lejay",

note = "Funding Information: This study is partly supported by a Grant in Aid for Scientific Research (No. 21540356) from the Japan Society for the Promotion of Science.",

year = "2013",

month = aug,

doi = "10.3938/jkps.63.644",

language = "英語",

volume = "63",

pages = "644--649",

journal = "Journal of the Korean Physical Society",

issn = "0374-4884",

publisher = "Korean Physical Society",

number = "3",

}

TY - JOUR

T1 - Enhancement of the curie temperature due to the coupling between Fe itinerant electrons and Dy localized electrons in DyFe2Zn20

AU - Isikawa, Yosikazu

AU - Mizushima, Toshio

AU - Miyamoto, Souta

AU - Kumagai, Keigou

AU - Nakahara, Mako

AU - Okuyama, Hiroaki

AU - Tayama, Takashi

AU - Kuwai, Tomohiko

AU - Lejay, Pascal

N1 - Funding Information: This study is partly supported by a Grant in Aid for Scientific Research (No. 21540356) from the Japan Society for the Promotion of Science.

PY - 2013/8

Y1 - 2013/8

N2 - The temperature dependences of the magnetization and the specific heat of the ferromagnetic compound DyFe2Zn20 have been measured in detail in various magnetic fields. We have observed anomalous magnetic behaviors, i.e., a strong anisotropy at 2 K, the disappearance of this anisotropy at temperatures between approximately 30 K and T c, and an anomalous behavior of the specific heat in magnetic fields at temperatures near 20 K. These anomalous phenomena have been analyzed based on the strong exchange interaction between the Fe itinerant electrons and the Dy localized electrons, as well as the crystalline electric field, the Zeeman energy, and an usual exchange interaction between two Dy atoms. The higher T c of DyFe2Zn20 compared with that of DyRu2Zn20 is caused by this exchange interaction between the Fe and the Dy atoms.

AB - The temperature dependences of the magnetization and the specific heat of the ferromagnetic compound DyFe2Zn20 have been measured in detail in various magnetic fields. We have observed anomalous magnetic behaviors, i.e., a strong anisotropy at 2 K, the disappearance of this anisotropy at temperatures between approximately 30 K and T c, and an anomalous behavior of the specific heat in magnetic fields at temperatures near 20 K. These anomalous phenomena have been analyzed based on the strong exchange interaction between the Fe itinerant electrons and the Dy localized electrons, as well as the crystalline electric field, the Zeeman energy, and an usual exchange interaction between two Dy atoms. The higher T c of DyFe2Zn20 compared with that of DyRu2Zn20 is caused by this exchange interaction between the Fe and the Dy atoms.

KW - CEF

KW - DyFeZn

KW - Ferrimagnet

KW - Itinerant electrons

KW - Magnetic anisotropy

KW - Rare earth

KW - Single crystal

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U2 - 10.3938/jkps.63.644

DO - 10.3938/jkps.63.644

M3 - 学術論文

AN - SCOPUS:84883019136

SN - 0374-4884

VL - 63

SP - 644

EP - 649

JO - Journal of the Korean Physical Society

JF - Journal of the Korean Physical Society

IS - 3

ER -