Noncollinear magnetic structure and anisotropic magnetoelastic coupling in cobalt pyrovanadate $$\mathrm{Co_2V_2O_7}$$
- Jülich Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT), Jülich (Germany). Jülich Centre for Neutron Science (JCNS), and Peter Grünberg Institut (PGI)
- Huazhong Univ. of Science and Technology, Wuhan (China). Wuhan National High Magnetic Field Center
- Peking Univ., Shenzhen (China). Shenzhen Graduate School, School of Advanced Materials
- Inst. für Festkörperphysik, Wien (Austria)
- Jülich Centre for Neutron Science (JCNS), Outstation at Spallation Neutron Source (SNS), Oak Ridge, TN (United States)
- Univ. of Macau, Taipa (China). Joint Key Lab. of the Ministry of Education, and Inst. of Applied Physics and Materials Engineering
- Jülich Centre for Neutron Science (JCNS), Garching (Germany)
- Ames Lab., Ames, IA (United States)
$$\mathrm{Co_2V_2O_7}$$ was recently reported to exhibit remarkable magnetic-field-induced magnetization plateaus and ferroelectricity, but its magnetic ground state remains ambiguous. Magnetometry measurements and time-of-flight neutron powder diffraction (NPD) have been employed to study the structural and magnetic properties of $$\mathrm{Co_2V_2O_7}$$, which includes two nonequivalent Co sites. Upon cooling below the Néel temperature $$T_N = 6.0(2)$$ K, we observe magnetic Bragg peaks at 2 K in NPD, which indicates the formation of long-range magnetic order of $$\mathrm{Co^{2+}}$$ moments. After symmetry analysis and magnetic structure refinement, we demonstrate that $$\mathrm{Co_2V_2O_7}$$ possesses a complicated noncollinear magnetic ground state with Co moments mainly located in the b-c plane and forming a noncollinear spin-chain-like structure along the c-axis. The ab initio calculations demonstrate that the noncollinear magnetic structure is more stable than various ferromagnetic states at low temperature. The noncollinear magnetic structure with a canted ↑↑↓↓ spin configuration is considered to be the origin of magnetoelectric coupling in$$\mathrm{Co_2V_2O_7}$$ because the inequivalent exchange striction induced by the spin-exchange interaction between the neighboring spins could be the driving force of ferroelectricity. Finally, it is also found that the deviation of lattice parameters a and b is opposite below $$T_N$$, while the lattice parameter c and $$β$$ stay almost constant below $$T_N$$, evidencing the anisotropic magnetoelastic coupling in $$\mathrm{Co_2V_2O_7}$$.
- Research Organization:
- Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- 11874023; 2016-6041; SRG2016-00091-FST; 063/2016/A2; 064/2016/A2; 028/2017/A1; 0051/2019/AFJ; AC02-07CH11358; AC02-05CH11231
- OSTI ID:
- 1572383
- Report Number(s):
- IS-J 10063; PRBMDO; TRN: US2100042
- Journal Information:
- Physical Review B, Vol. 100, Issue 13; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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