Spin Dynamics and Phonons in Chromites CoCr_(2)O_(4)and MnCr_(2)O_(4)  

作　　者：Wei Xu Gaoting Lin Mingfang Shu Jinlong Jiao Jinfeng Zhu Qingyong Ren Manh Duc Le Xuan Luo Yuping Sun Yi Liu Zhe Qu Haidong Zhou Shang Gao Jie Ma 徐威;林高庭;舒明方;焦金龙;朱金峰;任清勇;Manh Duc Le;罗轩;孙玉平;刘毅;屈哲;周海东;高尚;马杰(Key Laboratory of Artificial Structures and Quantum Control,School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;Spallation Neutron Source Science Center,Dongguan 523803,China;Guangdong Provincial Key Laboratory of Extreme Conditions,Dongguan 523803,China;ISIS Neutron and Muon Source,STFC Rutherford Appleton Laboratory,Didcot OX110QX,United Kingdom;Key Laboratory of Materials Physics,Institute of Solid State Physics,Chinese Academy of Sciences,Hefei 230031,China;Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions,High Magnetic Field Laboratory,Chinese Academy of Sciences,Hefei 230031,China;National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230026,China;Department of Physics and Astronomy,University of Tennessee,Knoxville 37996,USA;Department of Physics,University of Science and Technology of China,Hefei 230026,China;Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China)

机构地区：[1]Key Laboratory of Artificial Structures and Quantum Control,School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China [2]Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [3]Spallation Neutron Source Science Center,Dongguan 523803,China [4]Guangdong Provincial Key Laboratory of Extreme Conditions,Dongguan 523803,China [5]ISIS Neutron and Muon Source,STFC Rutherford Appleton Laboratory,Didcot OX110QX,United Kingdom [6]Key Laboratory of Materials Physics,Institute of Solid State Physics,Chinese Academy of Sciences,Hefei 230031,China [7]Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions,High Magnetic Field Laboratory,Chinese Academy of Sciences,Hefei 230031,China [8]National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230026,China [9]Department of Physics and Astronomy,University of Tennessee,Knoxville 37996,USA [10]Department of Physics,University of Science and Technology of China,Hefei 230026,China [11]Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China

出　　处：《Chinese Physics Letters》2024年第11期190-201,共12页中国物理快报（英文版）

基　　金：the financial support from the National Key Research and Development Program of China(Grant No.2022YFA1402702);the National Science Foundation of China(Grant Nos.U2032213 and 12004243);the National Science Foundation of China(Grant No.12274412);the Interdisciplinary Program of Wuhan National High Magnetic Field Center(Grant No.WHMFC 202122);Huazhong University of Science and Technology;the support from the National Natural Science Foundation of China(Grant No.52101236);Guangdong Basic and Applied Basic Research Foundation(Grant No.2021B1515140014);the Guangdong Provincial Key Laboratory of Extreme Conditions;financial support from the National Key Research and Development Program of China(Grant Nos.2021YFA1600201 and 2023YFA1607402);the support of NSF-DMR-2003117;supported by a beamtime allocation RB1910163 from the Science and Technology Facilities Council。

摘　　要：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.

关 键 词：exchange PRECISE EXCITATION 

分 类 号：O469[理学—凝聚态物理]