High temperature spin dynamics in linear magnetic chains, molecular rings, and segments by nuclear magnetic resonance

We present the room temperature proton nuclear magnetic resonance (NMR) nuclear spin-lattice relaxation rate (NSLR) results in two 1D spin chains: the Heisenberg antiferromagnetic (AFM) Eu(hfac)3NITEt and the magnetically frustrated Gd(hfac)3NITEt. The NSLR as a function of external magnetic field c...

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Bibliographic Details
Published in:Journal of applied physics 2015-05, Vol.117 (17)
Main Authors: Adelnia, Fatemeh, Mariani, Manuel, Ammannato, Luca, Caneschi, Andrea, Rovai, Donella, Winpenny, Richard, Timco, Grigore, Corti, Maurizio, Lascialfari, Alessandro, Borsa, Ferdinando
Format: Article
Language:English
Subjects:
ANISOTROPY
ANTIFERROMAGNETIC MATERIALS
ANTIFERROMAGNETISM
ATOMIC FORCE MICROSCOPY
CADMIUM
Chains
CHROMIUM
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CORRELATION FUNCTIONS
DIFFUSION
Gadolinium
HEISENBERG MODEL
High temperature
MAGNETIC FIELDS
Molecular chains
NMR
NMR SPECTRA
NUCLEAR MAGNETIC RESONANCE
Nuclear spin
PROTONS
SPECTRAL DENSITY
Spin dynamics
SPIN-LATTICE RELAXATION
TEMPERATURE DEPENDENCE
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Summary:We present the room temperature proton nuclear magnetic resonance (NMR) nuclear spin-lattice relaxation rate (NSLR) results in two 1D spin chains: the Heisenberg antiferromagnetic (AFM) Eu(hfac)3NITEt and the magnetically frustrated Gd(hfac)3NITEt. The NSLR as a function of external magnetic field can be interpreted very well in terms of high temperature spin dynamics dominated by a long time persistence of the decay of the two-spin correlation function due to the conservation of the total spin value for isotropic Heisenberg chains. The high temperature spin dynamics are also investigated in Heisenberg AFM molecular rings. In both Cr8 closed ring and in Cr7Cd and Cr8Zn open rings, i.e., model systems for a finite spin segment, an enhancement of the low frequency spectral density is found consistent with spin diffusion but the high cut-off frequency due to intermolecular anisotropic interactions prevents a detailed analysis of the spin diffusion regime.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4916022