Itinerant-electron metamagnetism and susceptibility maximum behavior in several kinds of Laves-phase compounds

M. Ohta; K. Fukamichi; A. Fujita; H. Saito; T. Goto

doi:10.1016/j.jallcom.2004.10.038

Itinerant-electron metamagnetism and susceptibility maximum behavior in several kinds of Laves-phase compounds

M. Ohta, K. Fukamichi, A. Fujita, H. Saito, T. Goto

ENG - Materials Science

Research output: Contribution to journal › Article

6 Citations (Scopus)

Abstract

The behavior of the metamagnetic transition and the magnetic susceptibility maximum in the Lu(Co_1-xSn_x)₂, Lu(Co _1-xGe_x)₂, Lu(Co_1-xSi _x)₂, Y(Co_1-xAl_x)₂, Y(Co_1-xGa_x)₂ and Y(Co_1-xSi _x)₂ compounds has been investigated. The critical magnetic field μ₀H_c for the metamagnetic transition decreases with the increase of x in Lu(Co_1-xSn_x)₂, Lu(Co_1-xGe_x)₂, Lu(Co_1-xSi _x)₂, Y(Co_1-xAl_x)₂ and Y(Co_1-xGa_x)₂, accompanied by a decrease of the magnetic susceptibility maximum temperature T_max. The larger the lattice expansion, the stronger the concentration dependences of μ₀H_c and T_max in the Lu(Co _1-xSn_x)₂, Lu(Co_1-xGe _x)₂ and Lu(Co_1-xSi_x)₂ systems. The exchange-enhanced Pauli paramagnetic properties are affected by the lattice expansion. The relation between the critical field of the metamagnetic transition μ₀H_c and the inverse magnetic susceptibility at T_max, χ(T_max)^-1, is fitted to a universal straight line. The onset of ferromagnetism in Y(Co _1-xGa_x)₂ has been verified for the first time. The values of the magnetic moment M_s and the Curie temperature T _C of Y(Co_1-xGa_x)₂ are smaller than those of Y(Co_1-xAl_x)₂. On the other hand, no evidence of the onset of a ferromagnetic state is obtained in the Y(Co _1-xSi_x)₂ compounds with 0.00 ≤ x ≤ 0.15. The ferromagnetism appears in both Lu(Co_1-xM_x)₂ and Y(Co_1-xM_x)₂ only when M is one of the group IIIA elements Al or Ga, implying that the p-d hybridization has a more significant effect on the onset of ferromagnetism than the lattice expansion.

Original language	English
Pages (from-to)	43-50
Number of pages	8
Journal	Journal of Alloys and Compounds
Volume	394
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2004.10.038
Publication status	Published - 2005 May 17

Keywords

High-field magnetic measurement
Itinerant-electron metamagnetism
Laves-phase compound
Magnetic-susceptibility maximum
Spin fluctuation
Weak itinerant-electron ferromagnetism

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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Ohta, M., Fukamichi, K., Fujita, A., Saito, H., & Goto, T. (2005). Itinerant-electron metamagnetism and susceptibility maximum behavior in several kinds of Laves-phase compounds. Journal of Alloys and Compounds, 394(1-2), 43-50. https://doi.org/10.1016/j.jallcom.2004.10.038

@article{e5650662a41d4e51aebf1ee46bf10f59,

title = "Itinerant-electron metamagnetism and susceptibility maximum behavior in several kinds of Laves-phase compounds",

abstract = "The behavior of the metamagnetic transition and the magnetic susceptibility maximum in the Lu(Co1-xSnx)2, Lu(Co 1-xGex)2, Lu(Co1-xSi x)2, Y(Co1-xAlx)2, Y(Co1-xGax)2 and Y(Co1-xSi x)2 compounds has been investigated. The critical magnetic field μ0Hc for the metamagnetic transition decreases with the increase of x in Lu(Co1-xSnx)2, Lu(Co1-xGex)2, Lu(Co1-xSi x)2, Y(Co1-xAlx)2 and Y(Co1-xGax)2, accompanied by a decrease of the magnetic susceptibility maximum temperature Tmax. The larger the lattice expansion, the stronger the concentration dependences of μ0Hc and Tmax in the Lu(Co 1-xSnx)2, Lu(Co1-xGe x)2 and Lu(Co1-xSix)2 systems. The exchange-enhanced Pauli paramagnetic properties are affected by the lattice expansion. The relation between the critical field of the metamagnetic transition μ0Hc and the inverse magnetic susceptibility at Tmax, χ(Tmax)-1, is fitted to a universal straight line. The onset of ferromagnetism in Y(Co 1-xGax)2 has been verified for the first time. The values of the magnetic moment Ms and the Curie temperature T C of Y(Co1-xGax)2 are smaller than those of Y(Co1-xAlx)2. On the other hand, no evidence of the onset of a ferromagnetic state is obtained in the Y(Co 1-xSix)2 compounds with 0.00 ≤ x ≤ 0.15. The ferromagnetism appears in both Lu(Co1-xMx)2 and Y(Co1-xMx)2 only when M is one of the group IIIA elements Al or Ga, implying that the p-d hybridization has a more significant effect on the onset of ferromagnetism than the lattice expansion.",

keywords = "High-field magnetic measurement, Itinerant-electron metamagnetism, Laves-phase compound, Magnetic-susceptibility maximum, Spin fluctuation, Weak itinerant-electron ferromagnetism",

author = "M. Ohta and K. Fukamichi and A. Fujita and H. Saito and T. Goto",

year = "2005",

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doi = "10.1016/j.jallcom.2004.10.038",

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pages = "43--50",

journal = "Journal of Alloys and Compounds",

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publisher = "Elsevier BV",

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TY - JOUR

T1 - Itinerant-electron metamagnetism and susceptibility maximum behavior in several kinds of Laves-phase compounds

AU - Ohta, M.

AU - Fukamichi, K.

AU - Fujita, A.

AU - Saito, H.

AU - Goto, T.

PY - 2005/5/17

Y1 - 2005/5/17

N2 - The behavior of the metamagnetic transition and the magnetic susceptibility maximum in the Lu(Co1-xSnx)2, Lu(Co 1-xGex)2, Lu(Co1-xSi x)2, Y(Co1-xAlx)2, Y(Co1-xGax)2 and Y(Co1-xSi x)2 compounds has been investigated. The critical magnetic field μ0Hc for the metamagnetic transition decreases with the increase of x in Lu(Co1-xSnx)2, Lu(Co1-xGex)2, Lu(Co1-xSi x)2, Y(Co1-xAlx)2 and Y(Co1-xGax)2, accompanied by a decrease of the magnetic susceptibility maximum temperature Tmax. The larger the lattice expansion, the stronger the concentration dependences of μ0Hc and Tmax in the Lu(Co 1-xSnx)2, Lu(Co1-xGe x)2 and Lu(Co1-xSix)2 systems. The exchange-enhanced Pauli paramagnetic properties are affected by the lattice expansion. The relation between the critical field of the metamagnetic transition μ0Hc and the inverse magnetic susceptibility at Tmax, χ(Tmax)-1, is fitted to a universal straight line. The onset of ferromagnetism in Y(Co 1-xGax)2 has been verified for the first time. The values of the magnetic moment Ms and the Curie temperature T C of Y(Co1-xGax)2 are smaller than those of Y(Co1-xAlx)2. On the other hand, no evidence of the onset of a ferromagnetic state is obtained in the Y(Co 1-xSix)2 compounds with 0.00 ≤ x ≤ 0.15. The ferromagnetism appears in both Lu(Co1-xMx)2 and Y(Co1-xMx)2 only when M is one of the group IIIA elements Al or Ga, implying that the p-d hybridization has a more significant effect on the onset of ferromagnetism than the lattice expansion.

AB - The behavior of the metamagnetic transition and the magnetic susceptibility maximum in the Lu(Co1-xSnx)2, Lu(Co 1-xGex)2, Lu(Co1-xSi x)2, Y(Co1-xAlx)2, Y(Co1-xGax)2 and Y(Co1-xSi x)2 compounds has been investigated. The critical magnetic field μ0Hc for the metamagnetic transition decreases with the increase of x in Lu(Co1-xSnx)2, Lu(Co1-xGex)2, Lu(Co1-xSi x)2, Y(Co1-xAlx)2 and Y(Co1-xGax)2, accompanied by a decrease of the magnetic susceptibility maximum temperature Tmax. The larger the lattice expansion, the stronger the concentration dependences of μ0Hc and Tmax in the Lu(Co 1-xSnx)2, Lu(Co1-xGe x)2 and Lu(Co1-xSix)2 systems. The exchange-enhanced Pauli paramagnetic properties are affected by the lattice expansion. The relation between the critical field of the metamagnetic transition μ0Hc and the inverse magnetic susceptibility at Tmax, χ(Tmax)-1, is fitted to a universal straight line. The onset of ferromagnetism in Y(Co 1-xGax)2 has been verified for the first time. The values of the magnetic moment Ms and the Curie temperature T C of Y(Co1-xGax)2 are smaller than those of Y(Co1-xAlx)2. On the other hand, no evidence of the onset of a ferromagnetic state is obtained in the Y(Co 1-xSix)2 compounds with 0.00 ≤ x ≤ 0.15. The ferromagnetism appears in both Lu(Co1-xMx)2 and Y(Co1-xMx)2 only when M is one of the group IIIA elements Al or Ga, implying that the p-d hybridization has a more significant effect on the onset of ferromagnetism than the lattice expansion.

KW - High-field magnetic measurement

KW - Itinerant-electron metamagnetism

KW - Laves-phase compound

KW - Magnetic-susceptibility maximum

KW - Spin fluctuation

KW - Weak itinerant-electron ferromagnetism

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U2 - 10.1016/j.jallcom.2004.10.038

DO - 10.1016/j.jallcom.2004.10.038

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VL - 394

SP - 43

EP - 50

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

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