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Title: Low temperature spin dynamics in Cr{sub 7}Ni-Cu-Cr{sub 7}Ni coupled molecular rings

Proton Nuclear Magnetic Resonance (NMR) relaxation measurements have been performed down to very low temperature (50 mK) to determine the effect of coupling two Cr{sub 7}Ni molecular rings via a Cu{sup 2+} ion. No difference in the spin dynamics was found from nuclear spin lattice relaxation down to 1.5 K. At lower temperature, the {sup 1}H-NMR line broadens dramatically indicating spin freezing. From the plot of the line width vs. magnetization, it is found that the freezing temperature is higher (260 mK) in the coupled ring with respect to the single Cr{sub 7}Ni ring (140 mK)
Authors:
 [1] ;  [2] ;  [3] ;  [4] ; ;  [1] ;  [5] ;  [3] ;  [6] ;  [3] ;  [5] ;  [3] ;  [3] ; ;  [7] ;  [1] ;  [2]
  1. INSTM and Department of Physics, Università di Pavia, I-27100 Pavia (Italy)
  2. (United States)
  3. (Italy)
  4. Ames Laboratory, and Department of Physics and Astronomy, Iowa State University, Iowa 50011 (United States)
  5. INSTM and Department of Physics, Università degli Studi di Milano, via Celoria 16, I-20133 Milano (Italy)
  6. Dipartimento di Fisica, Università di Parma, Viale Usberti 7/A, I-43100 Parma (Italy)
  7. The Lewis Magnetism Laboratory, The University of Manchester, M13 9PL Manchester (United Kingdom)
Publication Date:
OSTI Identifier:
22273950
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CHROMIUM; COPPER; COPPER IONS; COUPLING; FREEZING; HYDROGEN 1; INTERMETALLIC COMPOUNDS; LINE WIDTHS; MAGNETIZATION; NICKEL; NUCLEAR MAGNETIC RESONANCE; PROTONS; SPIN; SPIN-LATTICE RELAXATION; TEMPERATURE DEPENDENCE