Quasicritical Behaviour of the NMR and µSR Relaxation in YMn_{2}D_{x}

• Authors: A. Paja , P. Mietniowski , H. Figiel
• Languages of publication: EN

Abstracts

EN

The magnetic and structural properties of YMn_{2} are strongly influenced by introduction of hydrogen (deuterium) in the structure, however, it only slightly modifies the noncollinear antiferromagnetic structure of the compound. The temperature dependences of the NMR relaxation times T_{1} and T_{2} of deuterium and the zero-field relaxation of muons in YMn_{2}D_{x} were measured at temperatures above the magnetic ordering temperature T_{N}. The corresponding relaxation rates are described by the empirical expression (T/T_{N}-1)^{-η}, where the exponent η increases linearly with deuterium concentration x. To explain this behaviour, the Moriya theory of spin fluctuations was used. The expressions for NMR and μSR relaxation rates have been calculated. The resultant formulae agree well with the experiment, giving reasonable values of fitting parameters. The results obtained are discussed in terms of spin fluctuation excitation spectrum.

Keywords

EN

75.40.-s; 76.60.-k; 76.75.+i

Discipline

• 76.60.-k: Nuclear magnetic resonance and relaxation(see also 33.25.+k Nuclear resonance and relaxation in atomic and molecular physics and 82.56.-b Nuclear magnetic resonance in physical chemistry and chemical physics; for structure determination using magnetic resonance techniques, see 61.05.Qr; for biophysical applications, see 87.80.Lg; for NMR in superconducting materials, see 74.25.nj)
• 76.75.+i: Muon spin rotation and relaxation
• 75.40.-s: Critical-point effects, specific heats, short-range order(for equilibrium properties near critical points, see 64.60.F-; for dynamical critical phenomena, see 64.60.Ht)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2000
• Volume: 97
• Issue: 5
• Pages: 867-870

Dates

published

2000-05

Contributors

author

A. Paja

• University of Mining and Metallurgy, Faculty of Physics and Nuclear Techniques Department of Solid State Physics, Al. Mickiewicza 30, 30-059 Cracow, Poland

author

P. Mietniowski

• University of Mining and Metallurgy, Faculty of Physics and Nuclear Techniques Department of Solid State Physics, Al. Mickiewicza 30, 30-059 Cracow, Poland

author

H. Figiel

• University of Mining and Metallurgy, Faculty of Physics and Nuclear Techniques Department of Solid State Physics, Al. Mickiewicza 30, 30-059 Cracow, Poland

Identifiers

DOI

10.12693/APhysPolA.97.867