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Pressure Effect on the Magnetic Properties of the Heusler Alloy Co2NbGa

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Abstract

Magnetization measurements were conducted on a ferromagnetic Co2NbGa with the Heusler-type structure at various pressures. The spontaneous magnetic moment (ps) at 10 K under ambient pressure was determined to be 1.79(3) μB/f.u. The values of dps/dp and dlnps/dp at 10 K were estimated to be –0.13 × 10–3 μB·f.u.–1·kbar–1 and –7.3 × 10–5 kbar–1, respectively. The pressure derivative of the Curie temperature (TC) for Co2NbGa was determined by analyzing the temperature dependence of the initial permeability under pressures ranging up to 10 kbar. At ambient pressure, Co2NbGa had a TC value of 374.8 K, with dTC/dp and dlnTC/dp values of –0.69 K·kbar–1 and –1.84 × 10–3 kbar–1, respectively. The experimental results of the pressure-dependent magnetic properties for Co2NbGa were discussed on the basis of the spin fluctuation theory for itinerant electron magnetism.

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Acknowledgements

The authors express their gratitude to Professor T. Shishido and Mr. K. Obara from the Institute for Materials Research, Tohoku University, for their help in preparing the samples. In remembrance of the late Professor H. Nishihara, who unfortunately passed away during the preparation of the manuscript, we would like to dedicate this paper. The authors extend their heartfelt gratitude to the late H. Nishihara for his valuable suggestions and ongoing discussions throughout the course of this research. Part of this work was conducted under the Visiting Researcher’s Program of the Institute for Solid State Physics, the University of Tokyo.

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Authors and Affiliations

  1. Graduate School of Science and Technology, Yamagata University, Yonezawa, 992-8510, Japan

    Yoshiya Adachi & Yuki Ogi

  2. Graduate School of Engineering, Tohoku Gakuin University, Sendai, 984-8588, Japan

    Tatsuji Osaki

  3. Kurume Institute of Technology, Kurume, 830-0052, Japan

    Tetsujiro Eto

  4. Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan

    Takumi Kihara

  5. Research Institute for Interdisciplinary Science, Okayama University, Okayama, 700-8530, Japan

    Takumi Kihara

  6. Faculty of Science and Technology, Ryukoku University, Otsu, 520-2194, Japan

    Hironori Nishihara & Takuo Sakon

  7. Institute for Solid State Physics, University of Tokyo, Kashiwa, 277-8581, Japan

    Jun Gouchi & Yoshiya Uwatoko

  8. Research Institute for Engineering and Technology, Tohoku Gakuin University, Sendai, 984-8588, Japan

    Takeshi Kanomata

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  1. Yoshiya Adachi
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Correspondence to Yoshiya Adachi.

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Adachi, Y., Ogi, Y., Osaki, T. et al. Pressure Effect on the Magnetic Properties of the Heusler Alloy Co2NbGa. J Supercond Nov Magn 37, 249–254 (2024). https://doi.org/10.1007/s10948-023-06660-y

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  • DOI: https://doi.org/10.1007/s10948-023-06660-y

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