Published in
American Chemical Society, Journal of the American Chemical Society, 24(134), p. 9840-9843, 2012
DOI: 10.1021/ja301044p
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An endohedral single-molecule magnet with long relaxation times: DySc2N@C80
,
Cinthia Piamonteze ,
Stephen Weyeneth,
Harald Brune,
Stefano Rusponi,
Frithjof Nolting ,
Alexey Popov,
Shangfeng Yang,
Lothar Dunsch,
Thomas Greber
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Abstract
The magnetism of DySc(2)N@C(80) endofullerene was studied with X-ray magnetic circular dichroism (XMCD) and a magnetometer with a superconducting quantum interference device (SQUID) down to temperatures of 2 K and in fields up to 7 T. XMCD shows hysteresis of the 4f spin and orbital moment in Dy(III) ions. SQUID magnetometry indicates hysteresis below 6 K, while thermal and nonthermal relaxation is observed. Dilution of DySc(2)N@C(80) samples with C(60) increases the zero-field 4f electron relaxation time at 2 K to several hours.