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

Journal Article · Wed May 07 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4853255· OSTI ID:22273950

Furukawa, Y. ^[1]; Mariani, M.; Sabareesh, K. P. V. ^[2]; Garlatti, E. ^[3]; Carretta, S. ^[4]; Lascialfari, A. ^[3]; Timco, G.; Winpenny, R. E. P. ^[5]; Borsa, F. ^[2]

---

1. Ames Laboratory, and Department of Physics and Astronomy, Iowa State University, Iowa 50011 (United States)
2. INSTM and Department of Physics, Università di Pavia, I-27100 Pavia (Italy)
3. INSTM and Department of Physics, Università degli Studi di Milano, via Celoria 16, I-20133 Milano (Italy)
4. Dipartimento di Fisica, Università di Parma, Viale Usberti 7/A, I-43100 Parma (Italy)
5. The Lewis Magnetism Laboratory, The University of Manchester, M13 9PL Manchester (United Kingdom)

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)

• OSTI ID: 22273950
• Journal Information: Journal of Applied Physics, Vol. 115, 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); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

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