The Metamagnetic Transition in Pseudobinary Laves Phase Compounds Lu(Co1-xAlx)2

Endo, Ken; Iijima, M.; Shinogi, Akira; Ishiyama, Kouichi

doi:10.1143/jpsj.56.1316

Cited by 28 publications

(9 citation statements)

References 7 publications

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“…Magnetic properties of Lu(Co 1−x M x ) 2 (M = Al and Ga) Laves phase compounds are very sensitive to the annealing conditions. Together with the data (A) reported by Endo et al [16], the magnetization curve of the Lu(Co 0.920 Al 0.080 ) 2 compound annealed at 1273 K for 168 h (B) is shown in figure 1. The former exhibits a spontaneous magnetization with a broad hysteresis in the metamagnetic transition curves, whereas the latter exhibits a clear MT in relatively low fields.…”

Section: Resultssupporting

confidence: 54%

“…For Lu(Co 1−x Al x ) 2 with x = 0.06 and 0.08, on the other hand, an extremely broad hysteresis in the metamagnetic transition curves has been observed [16]. In addition, the coexistence of paramagnetic and ferromagnetic Co atoms in the compound with x = 0.08 has been indicated by NMR experiment [27].…”

Section: Introductionmentioning

confidence: 91%

“…In quasi-binary systems such as Y(Co 1−x Al x ) 2 [8,13,14], Lu(Co 1−x Al x ) 2 [10,15,16] and Lu(Co 1−x Ga x ) 2 [17], the ferromagnetic state becomes stable above a critical concentration x C . Below x C , these compounds exhibit a MT under an applied magnetic field, accompanied by a large positive volume magnetostriction [18,19].…”

Section: Introductionmentioning

confidence: 99%

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Itinerant-electron metamagnetism and magneto-volume effects in Lu(Co_1-xAl_x)₂Laves phase compounds

Yokoyama

Saito

Fukamichi

et al. 2001

J. Phys.: Condens. Matter

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The itinerant-electron metamagnetic transition (MT) and the effects of hydrostatic pressure on the critical transition field BC of the MT, on the spontaneous magnetization MS and on the Curie temperature TC have been investigated for well homogenized Lu(Co1-xAlx)2 Laves phase compounds. The critical field BC decreases with increasing x, maintaining a linear relationship with the inverse susceptibility at the temperature where the susceptibility exhibits a maximum value, χ-1(Tmax). On applying pressure, the magnetization M of the ferromagnetic compound with x = 0.100 is drastically decreased at a critical pressure, resulting in a paramagnetic state. In addition, the metamagnetic transition from the paramagnetic to the ferromagnetic state is induced by applying an external magnetic field. The effect of pressure on the Curie temperature TC is extremely large and negative in the vicinity of the critical concentration for the onset of ferromagnetism. The pressure coefficient of the Curie temperature, ∂ln TC/∂P, is much larger than that of the spontaneous magnetization, ∂ln MS/∂P, below x = 0.150. These results can be explained by the theory for itinerant ferromagnets having a negative coefficient b of the fourth-order term in the Landau expansion. The Landau expansion coefficients estimated from the experimental results are in accord with the theories. From these estimated values, it is concluded that the magneto-volume effect decreases the critical transition field BC. It has been confirmed that the results for Lu(Co1-xAlx)2 are very much analogous to those for Lu(Co1-xGax)2.

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Section: Resultssupporting

confidence: 54%

Section: Introductionmentioning

confidence: 91%

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Itinerant-electron metamagnetism and magneto-volume effects in Lu(Co_1-xAl_x)₂Laves phase compounds

Yokoyama

Saito

Fukamichi

et al. 2001

J. Phys.: Condens. Matter

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“…On the other hand, the value of γ sf is proportional to ln(1 − I ) because of a relatively large value of χ(0) in equation (4). Furthermore, the value of 0 obtained from NMR measurements for Y(Co 1−x Al x ) 2 becomes larger around the critical concentration of onset of the ferromagnetism [38].…”

Section: Resultsmentioning

confidence: 99%

“…Spin fluctuations influence various magnetic and electrical properties of exchange-enhanced Pauli paramagnetic Laves phase compounds such as ScCo 2 , YCo 2 and LuCo 2 [1,2]. Metamagnetic transition behaviours of Laves phase quasi-binary compounds such as Y(Co 1−x Al x ) 2 [3], Lu(Co 1−x Al x ) 2 [4,5], Lu(Co 1−x Ga x ) 2 [6,7], Lu(Co 1−x Sn x ) 2 [8,9] and Lu(Co 1−x Si x ) 2 [9,10] have been investigated extensively. The relation between the critical field of the itinerant-electron metamagnetic transition and the magnetic susceptibility maximum has been investigated systematically [3,11].…”

Section: Introductionmentioning

confidence: 99%

Kadowaki–Woods plot of exchange-enhanced Pauli paramagnetic Laves phase quasi-binary compounds Lu(Co_1 xM_x)₂

Fukamichi¹,

Ohta²,

Fujita³

et al. 2004

J. Phys.: Condens. Matter

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The electrical resistivity and low-temperature specific heat of exchangeenhanced Pauli paramagnetic Laves phase quasi-binary compounds Lu(Co 1−x M x ) 2 (M = Al, Ga and Si) have been investigated in order to discuss the spin fluctuation characteristics and the Kadowaki-Woods plot. In these three kinds of quasi-binary system, both the electrical resistivity coefficient A and the specific heat coefficient γ tot at low temperatures decrease at first and then significantly increase with increasing x. The concentration dependence of magnetic susceptibility at 0 K, χ(0), is also similar to that of A and γ tot . The Wilson ratio becomes very large because of the enhancement of magnetic susceptibility. The Kadowaki-Woods plot is fitted to the same universal line of heavy-fermion compounds, A15-type Nb 3 Sn and V 3 Si compounds because of significant spin fluctuations in the present quasi-binary compound systems.

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Figs. 130 - 156, Table 42

Kirchmayr¹,

Burzo²

Landolt-Börnstein - Group III Condensed Matter

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The Metamagnetic Transition in Pseudobinary Laves Phase Compounds Lu(Co_1-xAl_x)₂

Cited by 28 publications

References 7 publications

Itinerant-electron metamagnetism and magneto-volume effects in Lu(Co_1-xAl_x)₂Laves phase compounds

Itinerant-electron metamagnetism and magneto-volume effects in Lu(Co_1-xAl_x)₂Laves phase compounds

Kadowaki–Woods plot of exchange-enhanced Pauli paramagnetic Laves phase quasi-binary compounds Lu(Co_1 xM_x)₂

Figs. 130 - 156, Table 42

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The Metamagnetic Transition in Pseudobinary Laves Phase Compounds Lu(Co1-xAlx)2

Cited by 28 publications

References 7 publications

Itinerant-electron metamagnetism and magneto-volume effects in Lu(Co1-xAlx)2Laves phase compounds

Itinerant-electron metamagnetism and magneto-volume effects in Lu(Co1-xAlx)2Laves phase compounds

Kadowaki–Woods plot of exchange-enhanced Pauli paramagnetic Laves phase quasi-binary compounds Lu(Co1 xMx)2

Figs. 130 - 156, Table 42

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The Metamagnetic Transition in Pseudobinary Laves Phase Compounds Lu(Co_1-xAl_x)₂

Itinerant-electron metamagnetism and magneto-volume effects in Lu(Co_1-xAl_x)₂Laves phase compounds

Itinerant-electron metamagnetism and magneto-volume effects in Lu(Co_1-xAl_x)₂Laves phase compounds

Kadowaki–Woods plot of exchange-enhanced Pauli paramagnetic Laves phase quasi-binary compounds Lu(Co_1 xM_x)₂