Nuclear magnetic relaxation in the Ising-like antiferromagnet<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CsCoCl</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>: Domain-wall pairing in the 3D ordered phase

Kohmoto, T.; Goto, Takao; Maegawa, Satoru; Fujiwara, Naoki; Fukuda, Yukio; Kunitomo, M.; Mekata, Mamoru

doi:10.1103/physrevb.49.6028

Cited by 17 publications

(9 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A more general formula for 1 / T 2 had been obtained by Kohmoto et al 44 using a nonlinear theory of phase relaxation in the pulse fluctuating field instead of using the correlation function. We just present the result of the theory without derivation,…”

Section: A Nuclear Relaxation Due To Thermal Fluctuationsmentioning

confidence: 98%

“…For temperatures below 2 K where our measurements were performed, one can make the assumption that the fluctuating field is due to random jumps between two values of the hyperfine field 43,44 corresponding to the m = ± 10 and m = ± 9 states as shown by Goto et al in Mn12. 45 In this model one can assume a two-state pulse fluctuation with the magnitude h ␣ of the random field jumps and lifetimes 0 and 1 , respectively, for the two states.…”

Section: A Nuclear Relaxation Due To Thermal Fluctuationsmentioning

confidence: 98%

See 1 more Smart Citation

Fe57NMR and relaxation by strong collision in the tunneling regime in the molecular nanomagnet Fe8

et al. 2005

View full text Add to dashboard Cite

Fe NMR measurements have been performed in single crystal and oriented powder of enriched 57 Fe8 molecular cluster in the temperature range 0.05-1.7 K in zero external field and with small perturbing field up to 1 T for both transverse and longitudinal orientation of H with respect to the anisotropy axis. The 57 Fe NMR spectrum is analyzed in terms of a dominant contribution due to the hyperfine interaction arising from core polarization. The measured temperature dependence of the resonance frequency is explained well by calculating the local average magnetic moment of the Fe 3+ ion with a simple model which incorporates the effects of thermal average in the low lying energy states. Nuclear spin-lattice relaxation rate ͑1/T 1 ͒ and spin-spin relaxation rate ͑1/T 2 ͒ were investigated via temperature and field dependences. The obtained results are analyzed in terms of both intrawell thermal fluctuations of the hyperfine fields due to spin-phonon interaction, and interwell fluctuations due to phonon assisted quantum tunneling of the magnetization. It is argued that in zero external field and at low T the 57 Fe and the proton 1 / T 1 is dominated by a strong collision relaxation mechanism due to the fact that phonon assisted tunneling transitions generate a sudden reversal of the local quantization field at the nuclear site. The data could be explained satisfactorily by assuming that the 57 Fe 1 / T 1 measures directly the effective tunneling rate. However, in order to fit the data we had to assume a larger in-plane anisotropy than previously reported, resulting in a bigger tunneling splitting in zero field. A comparison with published data of 55 Mn in Mn12 indicates that a strong collision relaxation mechanism may apply also in Mn12. Finally the H and T dependence of 57 Fe 1 / T 2 is well explained simply in terms of thermal fluctuations of the magnetization without any tunneling contribution. At very low T the 1 / T 2 approaches a limiting value which can be explained in terms of the dipolar interaction between proton and 57 Fe nuclei in the quasistatic regime.

show abstract

Section: A Nuclear Relaxation Due To Thermal Fluctuationsmentioning

confidence: 98%

Section: A Nuclear Relaxation Due To Thermal Fluctuationsmentioning

confidence: 98%

Fe57NMR and relaxation by strong collision in the tunneling regime in the molecular nanomagnet Fe8

et al. 2005

View full text Add to dashboard Cite

show abstract

“…The two-level system with a stochastically fluctuating frequency has found wide applications in condensed phase physics ranging from magnetic resonance spectroscopy [1][2][3][4][5][6][7][8][9][10][11][12] and nonlinear optical spectroscopy [13][14][15][16][17] to the problem of decoherence and dephasing in spin-based solid state quantum computers [18][19][20]. This model is described by Kubo-Anderson stochastic differential equation in the form [2,3] …”

Section: Introductionmentioning

confidence: 99%

Kubo–Anderson oscillator and NMR of solid state

Sergeev

Olszewski²

2008

Solid State Nuclear Magnetic Resonance

View full text Add to dashboard Cite

“…A more general formula for l/Tg had been obtained by Kohmoto ef aZ. [130] using a non linear theory of phase relaxation in the pulse fluctuating Held instead of using the correlation function. We just present the result of the theory without derivation:…”

Section: Determination Of the Local Spin Arrangement In The Ground Statementioning

confidence: 99%

“…For temperatures below 2 K where our measurements were performed, one can make the assumption that the fluctuating Held is due to random jumps between two values of the hyperfine Held [46,130] …”

Section: Determination Of the Local Spin Arrangement In The Ground Statementioning

confidence: 99%

Spin dynamics and quantum tunneling in Fe8 nanomagnet and in AFM rings by NMR

Baek

View full text Add to dashboard Cite

Nuclear magnetic relaxation in the Ising-like antiferromagnetCsCoCl3: Domain-wall pairing in the 3D ordered phase

Cited by 17 publications

References 30 publications

Fe57NMR and relaxation by strong collision in the tunneling regime in the molecular nanomagnet Fe8

Fe57NMR and relaxation by strong collision in the tunneling regime in the molecular nanomagnet Fe8

Kubo–Anderson oscillator and NMR of solid state

Spin dynamics and quantum tunneling in Fe8 nanomagnet and in AFM rings by NMR

Contact Info

Product

Resources

About