| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Spin Dynamics and Phonons in Chromites CoCr$_{2}$O$_{4}$ and MnCr$_{2}$O$_{4}$ |
| Wei Xu1, Gaoting Lin1, Mingfang Shu1, Jinlong Jiao1, Jinfeng Zhu1, Qingyong Ren2,3,4, Manh Duc Le5, Xuan Luo6, Yuping Sun6,7,11, Yi Liu8, Zhe Qu7, Haidong Zhou9, Shang Gao10, and Jie Ma1,11* |
1Key Laboratory of Artificial Structures and Quantum Control, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
2Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
3Spallation Neutron Source Science Center, Dongguan 523803, China
4Guangdong Provincial Key Laboratory of Extreme Conditions, Dongguan 523803, China
5ISIS Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
6Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
7Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China
8National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026, China
9Department of Physics and Astronomy, University of Tennessee, Knoxville 37996, USA
10Department of Physics, University of Science and Technology of China, Hefei 230026, China
11Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
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| Cite this article: |
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Wei Xu, Gaoting Lin, Mingfang Shu et al 2024 Chin. Phys. Lett. 41 117503 |
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Abstract Spinel compounds are of great interest in both fundamental and application-oriented perspectives due to the geometric magnetic frustration inherent to their lattice and the resulting complex magnetic states. Here, we applied x-ray diffraction, magnetization, heat capacity and powder inelastic neutron scattering measurements, along with theoretical calculations, to study the exotic properties of chromite-spinel oxides CoCr$_{2}$O$_{4}$ and MnCr$_{2}$O$_{4}$. The temperature dependence of the phonon spectra provides an insight into the correlation between oxygen motion and the magnetic order, as well as the magnetoelectric effect in the ground state of MnCr$_{2}$O$_{4}$. Moreover, spin-wave excitations in CoCr$_{2}$O$_{4}$ and MnCr$_{2}$O$_{4}$ are compared with Heisenberg model calculations. This approach enables the precise determination of exchange energies and offers a comprehensive understanding of the spin dynamics and relevant exchange interactions in complicated spiral spin ordering.
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Received: 16 August 2024
Published: 14 November 2024
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| PACS: |
75.30.Et
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(Exchange and superexchange interactions)
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75.10.Jm
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(Quantized spin models, including quantum spin frustration)
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75.40.Gb
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(Dynamic properties?)
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