High-temperature spin dynamics as studied by electron paramagnetic resonance (EPR) in the quasi-one-dimensional Heisenberg magnetic system CuSO4·5H2O

Gharbage, Slimane; Meknassi, Otman Filali; Bissey, Jean-Claude; Servant, Y.

doi:10.1016/0378-4363(87)90035-0

Physica B+C

1987

DOI: 10.1016/0378-4363(87)90035-0

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High-temperature spin dynamics as studied by electron paramagnetic resonance (EPR) in the quasi-one-dimensional Heisenberg magnetic system CuSO4·5H2O

Slimane Gharbage

Otman Filali Meknassi

Jean-Claude Bissey

et al.

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Cited by 2 publications

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“…9 The diffusion equation was successfully used in a number of experimental papers to fit the data and explain the results of the experiments. 2,3 This approach was also confirmed by computer simulations. 4 The rest of this paper is organized as follows.…”

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confidence: 57%

Spin diffusion in one-dimensional antiferromagnets

Narozhny

1996

Phys. Rev. B

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We study the problem of spin diffusion in magnetic systems without long-range order. We discuss the example of the one-dimensional spin chain. For the system described by the Heisenberg Hamiltonian we show that there are no diffusive excitations. However, the addition of an arbitrarily small dissipation term, such as the spin-phonon interaction, leads to diffusive excitations in the long-time limit. For those excitations we estimate the spin-diffusion coefficient by means of the renormalization group analysis. ͓S0163-1829͑96͒01330-6͔

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confidence: 57%

Spin diffusion in one-dimensional antiferromagnets

Narozhny

1996

Phys. Rev. B

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Design for a multifrequency high magnetic field superconducting quantum interference device-detected quantitative electron paramagnetic resonance probe: Spin-lattice relaxation of cupric sulfate pentahydrate (CuSO4⋅5H2O)

Cage

Russek

2004

Review of Scientific Instruments

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We have designed a spectrometer for the quantitative determination of electron paramagnetic resonance (EPR) at high magnetic fields and frequencies. It uses a superconducting quantum interference device (SQUID) for measuring the magnetic moment as a function of the applied magnetic field and microwave frequency. We used powdered 2,2-diphenyl-1-picrylhydrazyl to demonstrate resolution of g-tensor anisotropy to 1 mT in a magnetic field of 3 T with a sensitivity of 1014 spins per 0.1 mT. We demonstrate multifrequency operation at 95 and 141 GHz. By use of an aligned single crystal of cupric sulfate pentahydrate (chalcanthite) CuSO4⋅5H2O, we show that the spectrometer is capable of EPR line shape analysis from 4 to 200 K with a satisfactory fit to a Lorentzian line shape at 100 K. Below 100 K, we observed line-broadening, g shifts, and spectral splittings, all consistent with a known low-dimensional phase transition. Using SQUID magnetometry and a superconducting magnet, we improve by an order of magnitude the sensitivity and magnetic field range of earlier power saturation studies of CuSO4⋅5H2O. We were able to saturate up to 70% of the magnetic moment with power transfer saturation studies at 95 GHz, 3.3 T, and 4 K and obtained the spin-lattice relaxation time, T1=1.8 ms, of CuSO4⋅5H2O at 3.3 T and 4 K. We found an inverse linear dependence of T1, in units of seconds (s) at 3.3 T between 4 and 2.3 K, such that T1=0.016⋅K⋅s⋅τ−1−0.0022⋅s, where τ is the absolute bath temperature. The quantitative determination of EPR is difficult with standard EPR techniques, especially at high frequencies or fields. Therefore this technique is of considerable value.

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High-temperature spin dynamics as studied by electron paramagnetic resonance (EPR) in the quasi-one-dimensional Heisenberg magnetic system CuSO4·5H2O

Cited by 2 publications

References 15 publications

Spin diffusion in one-dimensional antiferromagnets

Spin diffusion in one-dimensional antiferromagnets

Design for a multifrequency high magnetic field superconducting quantum interference device-detected quantitative electron paramagnetic resonance probe: Spin-lattice relaxation of cupric sulfate pentahydrate (CuSO4⋅5H2O)

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