Unveiling the magnetic structure and phase transition of Cr$_2$CoAl using neutron diffraction Article Swipe

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Guru Dutt Gupt , Yousef Kareri , James Hester , C. Ulrich , R. S. Dhaka ·

YOU? · · 2023 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2303.11869

We report the detailed analysis of temperature dependent neutron diffraction pattern of the Cr$_2$CoAl inverse Heusler alloy and unveil the magnetic structure up to the phase transition as well as its fully compensated ferrimagnetic nature. The Rietveld refinement of the diffraction pattern using the space group I$\bar4${\it m}2 confirm the inverse tetragonal structure over the large temperature range from 100~K to 900~K. The refinement of the magnetic phase considering the wave vector $k=$ (0, 0, 0) reveals the ferrimagnetic nature of the sample below 730$\pm$5~K. This transition temperature is obtained from empirical power law fitting of the variation in the ordered net magnetic moment and intensity of (110) peak as a function of temperature. The spin configuration of the microscopic magnetic structure suggests the nearly fully compensated ferrimagnetic behavior where the magnetic moments of Cr2 are antiparallel with respect to the Cr1, and Co moments. Moreover, the observed anomaly in the thermal expansion and lattice parameters at 730$\pm$5~K suggest that the distortion in crystal structure may play an important role in the magnetic phase transition.

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Condensed Matter Physics

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Ferrimagnetism Neutron diffraction Condensed matter physics Tetragonal crystal system Magnetic structure Rietveld refinement Materials science Phase transition Magnetic moment Crystal structure Chemistry Physics Crystallography Magnetization Magnetic field Quantum mechanics

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Type: preprint
Language: en
Landing Page: http://arxiv.org/abs/2303.11869
PDF: https://arxiv.org/pdf/2303.11869
OA Status: green
Related Works: 10
OpenAlex ID: https://openalex.org/W4353116167

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DOI: https://doi.org/10.48550/arxiv.2303.11869

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Title: Unveiling the magnetic structure and phase transition of Cr$_2$CoAl using neutron diffraction

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Type: preprint

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Language: en

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Publication year: 2023

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Publication date: 2023-03-21

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Authors: Guru Dutt Gupt, Yousef Kareri, James Hester, C. Ulrich, R. S. Dhaka

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Landing page: https://arxiv.org/abs/2303.11869

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Concepts: Ferrimagnetism, Neutron diffraction, Condensed matter physics, Tetragonal crystal system, Magnetic structure, Rietveld refinement, Materials science, Phase transition, Magnetic moment, Crystal structure, Chemistry, Physics, Crystallography, Magnetization, Magnetic field, Quantum mechanics

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