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Correlated Spin Dynamics and Phase Transitions in Pure and in Disordered 2D S = 1/2 Antiferromagnets: Insights from NMR-NQR

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Novel NMR and EPR techniques

Part of the book series: Lecture Notes in Physics ((LNP,volume 684))

Abstract

A recall of the phase diagram for two-dimensional quantum Heisenberg antiferromagnets (2DQHAF) and of the main issues involving phase transitions and spin dynamics in these systems is first given. After a pedagogical description of the basic aspects for the NMR-NQR relaxation rates in terms of amplitudes and decay rates of spin fluctuations, the problem of the temperature dependence of the correlation length in prototype, pure 2DQHAF (CFTD and La2CuO4) is addressed. Then spin- and charge-doped systems (Zn/Mg for Cu and Sr for La substitutions in La2CuO4) are considered and the effects on the spin stiffness, on the correlation length and on the staggered Cu2+ magnetic moment are reported, in particular near the percolation threshold. A critical outline of the properties of the cluster spin glass phase in Sr- doped La2CuO4 is given. Finally the results of a 63Cu NQR-NMR relaxation study around the quantum critical point (in CeCu6-xAux) are presented. It is pointed out how the 2D response function with anomalous exponent and energy/ temperature scaling indicated by neutron scattering is basically confirmed, while the 63Cu relaxation measurements reveal novel effects involving low-energy spin excitations and the role of an external magnetic field.

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Authors and Affiliations

  1. Department of Physics “A.Volta” and Unità INFM, University of Pavia Via Bassi n°6, Pavia, I-27100, Italy

    A. Rigamonti, P. Carretta & N. Papinutto

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  1. A. Rigamonti
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  2. P. Carretta
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  3. N. Papinutto
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Editors and Affiliations

  1. Physics Department Faculty of Mathematics and Physics, University Ljubljana, Jadranska 19, Ljubljana, 1000, Slovenia

    Janez Dolinšek Professor Dr.  & Slobodan Žumer Professor Dr.  & 

  2. Jozef Stefan Institute, Jamova 39, Ljubljana, 1000, Slovenia

    Janez Dolinšek Professor Dr. , Marija Vilfan Professor Dr.  & Slobodan Žumer Professor Dr. ,  & 

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Rigamonti, A., Carretta, P., Papinutto, N. (2006). Correlated Spin Dynamics and Phase Transitions in Pure and in Disordered 2D S = 1/2 Antiferromagnets: Insights from NMR-NQR. In: Dolinšek, J., Vilfan, M., Žumer, S. (eds) Novel NMR and EPR techniques. Lecture Notes in Physics, vol 684. Springer, Berlin, Heidelberg . https://doi.org/10.1007/3-540-32627-8_11

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