Magnetic properties of the half-metallic Heusler alloys Co
                        2
                        VAl and Co
                        2
                        VGa under pressure

T. Kanomata; Y. Chieda; K. Endo; H. Okada; Makoto Nagasako; K. Kobayashi; Ryosuke Kainuma; Rie Umetsu; H. Takahashi; Y. Furutani; H. Nishihara; Kazutaka Abe; Y. Miura; Masafumi Shirai

doi:10.1103/PhysRevB.82.144415

Magnetic properties of the half-metallic Heusler alloys Co ₂ VAl and Co ₂ VGa under pressure

T. Kanomata, Y. Chieda, K. Endo, H. Okada, Makoto Nagasako, K. Kobayashi, Ryosuke Kainuma, Rie Umetsu, H. Takahashi, Y. Furutani, H. Nishihara, Kazutaka Abe, Y. Miura, Masafumi Shirai

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

71 Citations (Scopus)

Abstract

Magnetization measurements have been carried out at high pressure up to 12.1 kbar for Co ₂ VAl and Co ₂ VGa with a miniature high-pressure clamp cell. The magnetic moment measured at 5 K is independent of pressure for Co ₂ VGa. This is an experimental observation that gives clear evidence that Co ₂ VGa possesses half-metallic electronic structure. On the other hand, a sizable pressure dependence of the magnetic moment is observed for Co ₂ VAl and it is attributed to the precipitation of the bcc particles in the matrix L 2 ₁ phase. The Curie temperature decreases with increasing pressure for Co ₂ VGa, reflecting characteristics typical for usual itinerant electron systems. The negative pressure dependence of the Curie temperature found in Co ₂ VGa contrasts fairly with that of other Heusler alloys containing Mn atoms.

Original language	English
Article number	144415
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	82
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.82.144415
Publication status	Published - 2010 Oct 7

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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Kanomata, T., Chieda, Y., Endo, K., Okada, H., Nagasako, M., Kobayashi, K., Kainuma, R., Umetsu, R., Takahashi, H., Furutani, Y., Nishihara, H., Abe, K., Miura, Y., & Shirai, M. (2010). Magnetic properties of the half-metallic Heusler alloys Co ₂ VAl and Co ₂ VGa under pressure Physical Review B - Condensed Matter and Materials Physics, 82(14), [144415]. https://doi.org/10.1103/PhysRevB.82.144415

Magnetic properties of the half-metallic Heusler alloys Co ₂ VAl and Co ₂ VGa under pressure . / Kanomata, T.; Chieda, Y.; Endo, K.; Okada, H.; Nagasako, Makoto; Kobayashi, K.; Kainuma, Ryosuke ; Umetsu, Rie; Takahashi, H.; Furutani, Y.; Nishihara, H.; Abe, Kazutaka; Miura, Y.; Shirai, Masafumi.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 82, No. 14, 144415, 07.10.2010.

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

Kanomata, T, Chieda, Y, Endo, K, Okada, H, Nagasako, M, Kobayashi, K, Kainuma, R , Umetsu, R, Takahashi, H, Furutani, Y, Nishihara, H, Abe, K, Miura, Y & Shirai, M 2010, ' Magnetic properties of the half-metallic Heusler alloys Co ₂ VAl and Co ₂ VGa under pressure ', Physical Review B - Condensed Matter and Materials Physics, vol. 82, no. 14, 144415. https://doi.org/10.1103/PhysRevB.82.144415

Kanomata T, Chieda Y, Endo K, Okada H, Nagasako M, Kobayashi K et al. Magnetic properties of the half-metallic Heusler alloys Co ₂ VAl and Co ₂ VGa under pressure Physical Review B - Condensed Matter and Materials Physics. 2010 Oct 7;82(14). 144415. https://doi.org/10.1103/PhysRevB.82.144415

Kanomata, T. ; Chieda, Y. ; Endo, K. ; Okada, H. ; Nagasako, Makoto ; Kobayashi, K. ; Kainuma, Ryosuke ; Umetsu, Rie ; Takahashi, H. ; Furutani, Y. ; Nishihara, H. ; Abe, Kazutaka ; Miura, Y. ; Shirai, Masafumi. / Magnetic properties of the half-metallic Heusler alloys Co ₂ VAl and Co ₂ VGa under pressure In: Physical Review B - Condensed Matter and Materials Physics. 2010 ; Vol. 82, No. 14.

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title = " Magnetic properties of the half-metallic Heusler alloys Co 2 VAl and Co 2 VGa under pressure ",

abstract = " Magnetization measurements have been carried out at high pressure up to 12.1 kbar for Co 2 VAl and Co 2 VGa with a miniature high-pressure clamp cell. The magnetic moment measured at 5 K is independent of pressure for Co 2 VGa. This is an experimental observation that gives clear evidence that Co 2 VGa possesses half-metallic electronic structure. On the other hand, a sizable pressure dependence of the magnetic moment is observed for Co 2 VAl and it is attributed to the precipitation of the bcc particles in the matrix L 2 1 phase. The Curie temperature decreases with increasing pressure for Co 2 VGa, reflecting characteristics typical for usual itinerant electron systems. The negative pressure dependence of the Curie temperature found in Co 2 VGa contrasts fairly with that of other Heusler alloys containing Mn atoms.",

author = "T. Kanomata and Y. Chieda and K. Endo and H. Okada and Makoto Nagasako and K. Kobayashi and Ryosuke Kainuma and Rie Umetsu and H. Takahashi and Y. Furutani and H. Nishihara and Kazutaka Abe and Y. Miura and Masafumi Shirai",

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T1 - Magnetic properties of the half-metallic Heusler alloys Co 2 VAl and Co 2 VGa under pressure

AU - Kanomata, T.

AU - Chieda, Y.

AU - Endo, K.

AU - Okada, H.

AU - Nagasako, Makoto

AU - Kobayashi, K.

AU - Kainuma, Ryosuke

AU - Umetsu, Rie

AU - Takahashi, H.

AU - Furutani, Y.

AU - Nishihara, H.

AU - Abe, Kazutaka

AU - Miura, Y.

AU - Shirai, Masafumi

PY - 2010/10/7

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N2 - Magnetization measurements have been carried out at high pressure up to 12.1 kbar for Co 2 VAl and Co 2 VGa with a miniature high-pressure clamp cell. The magnetic moment measured at 5 K is independent of pressure for Co 2 VGa. This is an experimental observation that gives clear evidence that Co 2 VGa possesses half-metallic electronic structure. On the other hand, a sizable pressure dependence of the magnetic moment is observed for Co 2 VAl and it is attributed to the precipitation of the bcc particles in the matrix L 2 1 phase. The Curie temperature decreases with increasing pressure for Co 2 VGa, reflecting characteristics typical for usual itinerant electron systems. The negative pressure dependence of the Curie temperature found in Co 2 VGa contrasts fairly with that of other Heusler alloys containing Mn atoms.

AB - Magnetization measurements have been carried out at high pressure up to 12.1 kbar for Co 2 VAl and Co 2 VGa with a miniature high-pressure clamp cell. The magnetic moment measured at 5 K is independent of pressure for Co 2 VGa. This is an experimental observation that gives clear evidence that Co 2 VGa possesses half-metallic electronic structure. On the other hand, a sizable pressure dependence of the magnetic moment is observed for Co 2 VAl and it is attributed to the precipitation of the bcc particles in the matrix L 2 1 phase. The Curie temperature decreases with increasing pressure for Co 2 VGa, reflecting characteristics typical for usual itinerant electron systems. The negative pressure dependence of the Curie temperature found in Co 2 VGa contrasts fairly with that of other Heusler alloys containing Mn atoms.

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