Quasi-one-dimensional excitations of copper metaborate in the commensurate phase

Martynov, S. N.; Petrakovskiı̌, G. A.; Roessli, B.

doi:10.1016/s0304-8853(03)00571-7

Cited by 18 publications

(5 citation statements)

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“…The 4b spins are slightly canted due to the Dzyaloshinskii-Moriya interaction, with a weak ferromagnetic moment along the [110]-type axes [13][14][15]. Elastic [13] and inelastic [28] neutron scattering Single crystals of CuB2O4 of good optical quality were grown as described previously [29]. Plane-parallel polished plates of (010) and (001) orientation with thickness between 50 and 100 μm were prepared from X-ray and optically oriented crystals.…”

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confidence: 99%

Antiferromagnetic Dichroism in a Complex Multisublattice MagnetoelectricCuB2O4

et al. 2015

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Magnetic control of the crystal chirality was announced by Saito et al. [Phys. Rev. Lett. 101, 117402 (2008)] on the ground of experiments in CuB(2)O(4). This claim has raised a sharp dispute in the literature because it seemed to contradict the fundamental symmetry principles. We settle this dispute on the basis of a high-resolution optical spectroscopy study of excitonic transitions in CuB(2)O(4). We find that a large sublattice-sensitive antiferromagnetic linear dichroism (LD) emerges at the Néel temperature T(N)=21 K and show how it could simulate a "magnetic-field control of the crystal chirality." We prove that the discovered LD is related microscopically to the magnetic Davydov splitting. This LD is highly sensitive to subtle changes in the spin subsystems, which allowed us to observe a splitting of the phase transition into an incommensurate magnetic phase into two transitions (T(1)(*)=8.5 and T(2)(*)=7.9 K) and to suggest elliptical spiral structures below T(1)(*), instead of a simple circular helix proposed earlier.

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Antiferromagnetic Dichroism in a Complex Multisublattice MagnetoelectricCuB2O4

et al. 2015

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“…Причем если в подсистеме 4b реализуются несколько магнитных фазовых переходов в диапазоне температур T < T N = 21 K, то 8d-подсистема является квазиодномерной и не упорядочивается даже при гелиевых температурах. Исследования магнитной структуры этого соединения ведутся уже более двадцати лет [2][3][4][5][6][7], однако до сих пор продолжается изучение и уточнение богатой температурно-полевой (B−T ) фазовой диаграммы метабората. Помимо стандартных методов исследования магнитной структуры [2][3][4][5][6][7], которые применялись к CuB 2 O 4 , использовался также спектроскопический метод линейного дихроизма (ЛД), который оказался информативным и точным.…”

Section: Introductionunclassified

“…Исследования магнитной структуры этого соединения ведутся уже более двадцати лет [2][3][4][5][6][7], однако до сих пор продолжается изучение и уточнение богатой температурно-полевой (B−T ) фазовой диаграммы метабората. Помимо стандартных методов исследования магнитной структуры [2][3][4][5][6][7], которые применялись к CuB 2 O 4 , использовался также спектроскопический метод линейного дихроизма (ЛД), который оказался информативным и точным. Так, например, исключительно с помощью этого метода удалось зарегистрировать расщепление перехода при T * = 9 K в геликоидальную магнитную структуру на два перехода при T * 1 = 7.9 K и T * 2 = 8.5 K [8].…”

Section: Introductionunclassified

Синтез И Оптические Свойства Кристаллов Метабората Меди, Легированного Никелем

Молчанова¹,

Мошкина²,

Молокеев³

et al. 2022

Оптика И Спектроскопия

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This work presents information on the growth and spectroscopic study of single crystals of copper metaborate doped with nickel Cu1-xNixB2O4 (x = 0.05, 0.1). In the absorption spectra of both crystals, satellites related to Cu centers distorted by impurity Ni atoms were observed near the lines of zero phonon transitions. Polarization studies in the isotropic ab-plane of the tetragonal crystal Cu1-xNixB2O4 show the presence of linear magnetic dichroism in the magnetically ordered state, which was previously observed both in manganese-doped and undoped copper metaborates CuB2O4. The temperature of magnetic phase transitions into the collinear antiferromagnetic and into helicoidal structures, TN = 19.1 K and T* = 8.6 К, respectively, were determined from the temperature dependence of the dichroic signal.

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“…Copper cations in CuB 2 O 4 occupy two nonequivalent positions. This causes the formation of two magnetic subsystems, one of which is three-dimensional and is ordered at T N = 20 K, whereas the second is formed by zigzag chains of copper ions with frustrated exchange bonds with the first subsystem [4]. The exchange between chains is also frustrated and weak.…”

Section: Introductionmentioning

confidence: 99%

IR and NMR Spectra of Crystalline and Amorphous Copper Metaborate

et al. 2005

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and NMR spectroscopic investigations of crystalline and amorphous copper metaborate CuB 2 O 4 as well as of copper metaborate crystallized from the amorphous state have been carried out for the first time. For an amorphous sample, a new wide absorption band arises in the frequency range ~1200-1600 cm -1 . This band is due to conversion of a number of tetrahedral BO 4 units of the crystalline sample into the trigonal BO 3 units. The presence of trigonal units in amorphous СuB 2 O 4 is confirmed by the 11 B NMR spectra. Based on the data of IR and NMR spectroscopy, significant intensification of the exchange interaction is explained by the formation of shorter exchange bridges during amorphyzation of СuB 2 O 4 .

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Quasi-one-dimensional excitations of copper metaborate in the commensurate phase

Cited by 18 publications

References 10 publications

Antiferromagnetic Dichroism in a Complex Multisublattice MagnetoelectricCuB2O4

Antiferromagnetic Dichroism in a Complex Multisublattice MagnetoelectricCuB2O4

Синтез И Оптические Свойства Кристаллов Метабората Меди, Легированного Никелем

IR and NMR Spectra of Crystalline and Amorphous Copper Metaborate

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