Open AccessEntanglement in Supramolecular Spin Systems of Two Weakly Coupled Antiferromagnetic Rings (Purple-C r 7 Ni
Author(s) -
Andrea Candini,
Giulia Lorusso,
Filippo Troiani,
Alberto Ghirri,
Stefano Carretta,
P. Santini,
G. Amoretti,
C. Muryn,
Floriana Tuna,
Grigore A. Timco,
Eric J. L. McInnes,
Richard E. P. Winpenny,
Wolfgang Wernsdorfer,
M. Affronte
Publication year - 2010
Publication title -
physical review letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.688
H-Index - 673
eISSN - 1079-7114
pISSN - 0031-9007
DOI - 10.1103/physrevlett.104.037203
Subject(s) - antiferromagnetism , quantum entanglement , electron paramagnetic resonance , physics , magnetic susceptibility , hamiltonian (control theory) , supramolecular chemistry , condensed matter physics , spin (aerodynamics) , nuclear magnetic resonance , ring (chemistry) , qubit , paramagnetism , crystallography , quantum mechanics , chemistry , quantum , molecule , thermodynamics , organic chemistry , mathematical optimization , mathematics
We characterize supramolecular magnetic structures, consisting of two weakly coupled antiferromagnetic rings, by low-temperature specific heat, susceptibility, magnetization and electron paramagnetic resonance measurements. Intra- and inter-ring interactions are modeled through a microscopic spin-Hamiltonian approach that reproduces all the experimental data quantitatively and legitimates the use of an effective two-qubit picture. Spin entanglement between the rings is experimentally demonstrated through magnetic susceptibility below 50 mK and theoretically quantified by the concurrence.
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