Magnetism in UCO1-xTxAl (T = Fe, Ni) single crystals

Alexander V. Andreey; Blanka Janoušoyà; Yladimir Sechoysky; Yoshiya Homma; Yoshinobu Shiokawa

doi:10.1080/00223131.2002.10875436

Magnetism in UCO_1-xT_xAl (T = Fe, Ni) single crystals

Alexander V. Andreey, Blanka Janoušoyà, Yladimir Sechoysky, Yoshiya Homma, Yoshinobu Shiokawa

IMR - Materials Processing and Characterization Division

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

1 Citation (Scopus)

Abstract

UCoA1 has a paramagnetic ground state, although the c-axis susceptibility shows a maximum at T_max ≈ 20 K. The low-T state is easily modified to ferromagnetism by application of magnetic field along the c-axis or by doping by suitable elements. The field and temperature dependences of the magnetization and specific heat of single crystals of the UCo_1-xT_xA_l (T = Fe, Ni) solid solutions are presented. All the compounds exhibit a strong uniaxial anisotropy with the dominant magnetic response along the oaxis of the hexagonal ZrNiAl-type structure. Ni substitution yields an increase of the critical field for metamagnetism which disappears at x = 0.10. UCo_0.95Fe_0.05Al is ferromagnetic below 30 K. UCo_0.98Fe_0.02Al and UCo_0.95Fe_0.05Ni_0.05Al exhibit ferromagnetism with a significant trace of metamagnetism. An analysis of specific-heat data for UCoAl and UCo_0.95Ni_0.05Al in 0 and 10 T allows the entropy contributions due to spin fluctuations to be extracted.

Original language	English
Pages (from-to)	172-175
Number of pages	4
Journal	Journal of Nuclear Science and Technology
Volume	39
DOIs	https://doi.org/10.1080/00223131.2002.10875436
Publication status	Published - 2002 Nov

Keywords

Ferromagnetism
Metamagnetism
Spin fluctuations
UCoAl

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10.1080/00223131.2002.10875436

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title = "Magnetism in UCO1-xTxAl (T = Fe, Ni) single crystals",

abstract = "UCoA1 has a paramagnetic ground state, although the c-axis susceptibility shows a maximum at Tmax ≈ 20 K. The low-T state is easily modified to ferromagnetism by application of magnetic field along the c-axis or by doping by suitable elements. The field and temperature dependences of the magnetization and specific heat of single crystals of the UCo1-xTxAl (T = Fe, Ni) solid solutions are presented. All the compounds exhibit a strong uniaxial anisotropy with the dominant magnetic response along the oaxis of the hexagonal ZrNiAl-type structure. Ni substitution yields an increase of the critical field for metamagnetism which disappears at x = 0.10. UCo0.95Fe0.05Al is ferromagnetic below 30 K. UCo0.98Fe0.02Al and UCo0.95Fe0.05Ni0.05Al exhibit ferromagnetism with a significant trace of metamagnetism. An analysis of specific-heat data for UCoAl and UCo0.95Ni0.05Al in 0 and 10 T allows the entropy contributions due to spin fluctuations to be extracted.",

keywords = "Ferromagnetism, Metamagnetism, Spin fluctuations, UCoAl",

author = "Andreey, {Alexander V.} and Blanka Janou{\v s}oy{\`a} and Yladimir Sechoysky and Yoshiya Homma and Yoshinobu Shiokawa",

year = "2002",

month = nov,

doi = "10.1080/00223131.2002.10875436",

language = "English",

volume = "39",

pages = "172--175",

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T1 - Magnetism in UCO1-xTxAl (T = Fe, Ni) single crystals

AU - Andreey, Alexander V.

AU - Janoušoyà, Blanka

AU - Sechoysky, Yladimir

AU - Homma, Yoshiya

AU - Shiokawa, Yoshinobu

PY - 2002/11

Y1 - 2002/11

N2 - UCoA1 has a paramagnetic ground state, although the c-axis susceptibility shows a maximum at Tmax ≈ 20 K. The low-T state is easily modified to ferromagnetism by application of magnetic field along the c-axis or by doping by suitable elements. The field and temperature dependences of the magnetization and specific heat of single crystals of the UCo1-xTxAl (T = Fe, Ni) solid solutions are presented. All the compounds exhibit a strong uniaxial anisotropy with the dominant magnetic response along the oaxis of the hexagonal ZrNiAl-type structure. Ni substitution yields an increase of the critical field for metamagnetism which disappears at x = 0.10. UCo0.95Fe0.05Al is ferromagnetic below 30 K. UCo0.98Fe0.02Al and UCo0.95Fe0.05Ni0.05Al exhibit ferromagnetism with a significant trace of metamagnetism. An analysis of specific-heat data for UCoAl and UCo0.95Ni0.05Al in 0 and 10 T allows the entropy contributions due to spin fluctuations to be extracted.

AB - UCoA1 has a paramagnetic ground state, although the c-axis susceptibility shows a maximum at Tmax ≈ 20 K. The low-T state is easily modified to ferromagnetism by application of magnetic field along the c-axis or by doping by suitable elements. The field and temperature dependences of the magnetization and specific heat of single crystals of the UCo1-xTxAl (T = Fe, Ni) solid solutions are presented. All the compounds exhibit a strong uniaxial anisotropy with the dominant magnetic response along the oaxis of the hexagonal ZrNiAl-type structure. Ni substitution yields an increase of the critical field for metamagnetism which disappears at x = 0.10. UCo0.95Fe0.05Al is ferromagnetic below 30 K. UCo0.98Fe0.02Al and UCo0.95Fe0.05Ni0.05Al exhibit ferromagnetism with a significant trace of metamagnetism. An analysis of specific-heat data for UCoAl and UCo0.95Ni0.05Al in 0 and 10 T allows the entropy contributions due to spin fluctuations to be extracted.

KW - Ferromagnetism

KW - Metamagnetism

KW - Spin fluctuations

KW - UCoAl

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JO - Journal of Nuclear Science and Technology

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ER -

Magnetism in UCO_1-xT_xAl (T = Fe, Ni) single crystals

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Keywords

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