Magnetic structure of the Sr2Cu3O4Cl2 two-subsystem antiferromagnet according to nuclear quadrupole resonance data |
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Authors: | A. A. Gippius E. N. Morozova K. S. Okhotnikov E. A. Alkaev |
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Affiliation: | (1) Moscow State University, Moscow, 119992, Russia;(2) Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskiĭ pr. 59, Moscow, 119333, Russia |
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Abstract: | The magnetic structure of the Sr2Cu3O4Cl2 two-subsystem antiferromagnet is studied by the nuclear quadrupole resonance (NQR) method on the 63, 65Cu and 35Cl nuclei. The resonance spectrum above T N2 = 40 K is determined by the Zeeman splitting of the levels of the 63, 65Cu nuclei of the copper atoms at the Cu1 site with the first-order quadrupole perturbation. The magnetic field on the copper nuclei is equal to 93 kOe. The spectrum below n is significantly different: it includes a low-frequency part, which is associated with the ordering of the second magnetic subsystem Cu2. The splitting of the NQR lines of 35Cl is observed above and below T N2. This fact indicates the ferromagnetic ordering of the moments of the Cu1 subsystem, which are located along the c axis of the crystal, and makes it possible to determine the direction of the magnetic field on Cu1 copper as (110). |
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