New magnetic states in copper metaborate CuB2O4

Pankrats, A. I.; Petrakovskiı̌, G. A.; Popov, M. A.; Sablina, K. A.; Prozorova, L. A.; Sosin, S. S.; Szimczak, G.; Szimczak, R.; Баран, М.

doi:10.1134/1.1641486

Cited by 25 publications

(16 citation statements)

References 7 publications

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“…All the available literature data point to the incommensurability of magnetic structures in the left-side part of the phase diagram of CuB2O4. A simple spin helix magnetic structure was suggested in a number of works, with the propagation vector along the tetragonal z-axis [14,15,33]. However, this picture is not compatible with our experimental magnetic LD data because in the case of a simple spin helix the LD would obviously vanish by symmetry arguments.…”

Section: Fig 3 (Color Online)contrasting

confidence: 83%

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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Section: Fig 3 (Color Online)contrasting

confidence: 83%

Antiferromagnetic Dichroism in a Complex Multisublattice MagnetoelectricCuB2O4

et al. 2015

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“…The temperature dependence of the resonance spectrum is attributed to the fact that T * decreases with increasing applied field. 4) In other words, for example, at T = 7.5 K the spin system is in the incommensurate phase at B = 0.45T, while it is still in the commensurate phase under the magnetic fields B ≥ 0.5T.…”

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confidence: 99%

NMR Study of the Successive Phase Transitions in C\lowercaseuB₂O₄

Nakamura

Fujii

Kikuchi

et al. 2005

Prog. Theor. Phys. Suppl.

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Nuclear magnetic resonance (NMR) experiments on copper metaborate CuB2O4 are performed in order to study the successive phase transitions which includes the transition from the paramagnetic to the commensurate weak ferromagnetic phase at TN = 21 K and further transition to the incommensurate helix phase at T * ∼ 10 K. 11 B-NMR spectra obtained for three crystal orientations (B [001], [110], [100]) were split into several lines below TN and changed into more complicated line shapes below T * . The results of the angular dependence of the spectrum in the commensurate phase and the nuclear spin-lattice relaxation rate T −1 1 are also discussed.

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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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New magnetic states in copper metaborate CuB2O4

Cited by 25 publications

References 7 publications

Antiferromagnetic Dichroism in a Complex Multisublattice MagnetoelectricCuB2O4

Antiferromagnetic Dichroism in a Complex Multisublattice MagnetoelectricCuB2O4

NMR Study of the Successive Phase Transitions in C\lowercaseuB₂O₄

Синтез И Оптические Свойства Кристаллов Метабората Меди, Легированного Никелем

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New magnetic states in copper metaborate CuB2O4

Cited by 25 publications

References 7 publications

Antiferromagnetic Dichroism in a Complex Multisublattice MagnetoelectricCuB2O4

Antiferromagnetic Dichroism in a Complex Multisublattice MagnetoelectricCuB2O4

NMR Study of the Successive Phase Transitions in C\lowercaseuB2O4

Синтез И Оптические Свойства Кристаллов Метабората Меди, Легированного Никелем

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NMR Study of the Successive Phase Transitions in C\lowercaseuB₂O₄