Electron spin resonance study of spin relaxation in the strong-leg spin ladder with nonmagnetic dilution

Krasnikova, Yu. V.; Glazkov, V. N.; Ponomaryov, A. N.; Zvyagin, S. A.; Povarov, K. Yu.; Galeski, Stanislaw; Zheludev, A.

doi:10.1103/physrevb.100.144446

Cited by 3 publications

(4 citation statements)

References 36 publications

(49 reference statements)

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“…Intensity of the observed low-temperature absorption can be scaled with magnetic susceptibility [79], which allows to estimate concentration of paramagnetic centers. This concentration turns out to be comparable with nominal zinc content and the discrepancies can be accounted by taking into account effective interaction between these centers [82].…”

Section: Uresmentioning

confidence: 67%

“…Measurement of angular dependencies of ESR linewidth in (C 7 H 10 N 2 ) 2 Cu 1−x Zn x Br 4 demonstrate that these dependencies scale on each other and on similar dependencies for pure DIMPY for all zinc contents studied at the temperatures from 8 to 100 K [82]. This means [24], that microscopic mechanism of spin relaxation in high-temperature regime is the same for pure and diamagnetically diluted DIMPY, which is (as it was proved for pure compound [78]) the uniform Dzyaloshinskii-Moriya interaction.…”

Section: Uresmentioning

confidence: 71%

“…This means [24], that microscopic mechanism of spin relaxation in high-temperature regime is the same for pure and diamagnetically diluted DIMPY, which is (as it was proved for pure compound [78]) the uniform Dzyaloshinskii-Moriya interaction. Thus, effect of diamagnetic dilution on spin dynamics of DIMPY can be interpreted as the suppression of relaxation channel related to the Dzyaloshinskii-Moriya interaction in a certain vicinity of the defect [82].…”

Section: Uresmentioning

confidence: 99%

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Magnetic resonance of collective paramagnets with gapped excitations spectrum

Glazkov

2020

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This text is an expanded author-translated version of the review prepared for the memorial issue of Journal of Experimental and Theoretical Physics dedicated to 100-year anniversary of A.S. Borovik-Romanov (full memorial volume is available as JETP 131 No.1 (2020) [ZhETF 158 No.1 (2020)]) Some magnets due to particular geometry of the exchange bonds do not undergo transition to the conventional magnetically ordered state despite of the presence of significant exchange couplings. Instead, a collective paramagnetic state is formed. The later state can remain stable down to T = 0 if the ground state of this magnet turns out to be nonmagnetic singlet separated from the excited triplet states by an energy gap. Low-temperature spin dynamics of the collective paramagnets with gapped excitations spectrum (or spin-gap magnets) can be described in terms of a dilute gas of the triplet excitations. Applied magnetic field can suppress the energy gap, resulting in the formation of the gapless spin-liquid state or even leading to the unusual phenomenon of field-induced antiferromagnetic order. Introduction of defects in the crystallographic structure of the spin-gap magnet can result either in the formation of multi-spin paramagnetic center or in the formation of randomly distributed modified exchange bonds in the crystal. This review includes results of electron spin resonance (ESR) spectroscopy study of several representative quantum paramagnets with gapped excitations spectrum: quasy-two-dimensional magnet (C4H12N2)Cu2Cl6, quasy-one-dimensional magnets of "spin-tube" type Cu2Cl4•H8C4SO2 and "spin-ladder" type (C7H10N2)2CuBr4. We will demonstrate that ESR absorption spectra reveal common features of these systems: ESR spectroscopy allows to observe and characterize fine structure if the triplet energy levels, to identify many-particles relaxation processes in the gas of triplet excitations and to observe collective spin-wave oscillations in the field induced antiferromagnetically ordered state, as well as to observe some individual features of the studied systems.

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Section: Uresmentioning

confidence: 67%

Section: Uresmentioning

confidence: 71%

Section: Uresmentioning

confidence: 99%

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Magnetic resonance of collective paramagnets with gapped excitations spectrum

Glazkov

2020

Preprint

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“…Non-magnetic Zn 2+ impurities have been studied in two-leg spin ladders previously. Examples include Sr(Cu 1 – x Zn x ) 2 O 3 , Bi(Cu 1 – x Zn x ) 2 PO 6 , and (C 7 H 10 N) 2 Cu 1 – x Zn x (Br) 4 . − These two-leg spin ladders lie on the spin singlet side of the two-leg spin ladder phase diagram, where J inter is weak, creating near-isolated spin ladders. As expected, the introduction of Zn 2+ creates “free” Cu 2+ spins as singlet dimers are broken by the removal of Cu 2+ .…”

Section: Introductionmentioning

confidence: 99%

Partitioning the Two-Leg Spin Ladder in Ba₂Cu_1 – xZn_xTeO₆: From Magnetic Order through Spin-Freezing to Paramagnetism

et al. 2023

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Ba2CuTeO6 has attracted significant attention as it contains a two-leg spin ladder of Cu2+ cations that lies in close proximity to a quantum critical point. Recently, Ba2CuTeO6 has been shown to accommodate chemical substitutions, which can significantly tune its magnetic behavior. Here, we investigate the effects of substitution for non-magnetic Zn2+ impurities at the Cu2+ site, partitioning the spin ladders. Results from bulk thermodynamic and local muon magnetic characterization on the Ba2Cu1 – x Zn x TeO6 solid solution (0 ≤ x ≤ 0.6) indicate that Zn2+ partitions the Cu2+ spin ladders into clusters and can be considered using the percolation theory. As the average cluster size decreases with increasing Zn2+ substitution, there is an evolving transition from long-range order to spin-freezing as the critical cluster size is reached between x = 0.1 to x = 0.2, beyond which the behavior became paramagnetic. This demonstrates well-controlled tuning of the magnetic disorder, which is highly topical across a range of low-dimensional Cu2+-based materials. However, in many of these cases, the chemical disorder is also relatively strong in contrast to Ba2CuTeO6 and its derivatives. Therefore, Ba2Cu1 – x Zn x TeO6 provides an ideal model system for isolating the effect of defects and segmentation in low-dimensional quantum magnets.

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Magnetic Resonance in Collective Paramagnets with Gapped Excitation Spectrum

Glazkov

2020

J. Exp. Theor. Phys.

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Electron spin resonance study of spin relaxation in the strong-leg spin ladder with nonmagnetic dilution

Cited by 3 publications

References 36 publications

Magnetic resonance of collective paramagnets with gapped excitations spectrum

Magnetic resonance of collective paramagnets with gapped excitations spectrum

Partitioning the Two-Leg Spin Ladder in Ba₂Cu_1 – xZn_xTeO₆: From Magnetic Order through Spin-Freezing to Paramagnetism

Magnetic Resonance in Collective Paramagnets with Gapped Excitation Spectrum

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Electron spin resonance study of spin relaxation in the strong-leg spin ladder with nonmagnetic dilution

Cited by 3 publications

References 36 publications

Magnetic resonance of collective paramagnets with gapped excitations spectrum

Magnetic resonance of collective paramagnets with gapped excitations spectrum

Partitioning the Two-Leg Spin Ladder in Ba2Cu1 – xZnxTeO6: From Magnetic Order through Spin-Freezing to Paramagnetism

Magnetic Resonance in Collective Paramagnets with Gapped Excitation Spectrum

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Partitioning the Two-Leg Spin Ladder in Ba₂Cu_1 – xZn_xTeO₆: From Magnetic Order through Spin-Freezing to Paramagnetism