Dimerized nature of magnetic interactions in the S = 1/2 quantum antiferromagnet Cu(en)2SO4

Unveiling a Family of Dimerized Quantum Magnets, Conventional Antiferromagnets, and Nonmagnets in Ternary Metal Borides

“…Experimental measurements show that YCrB 4 has a very small magnetic susceptibility, which was attributed to a small concentration of magnetic impurities . In dimerized spin-gap systems, the magnetic susceptibility is suppressed at temperatures that are small compared to the singlet–triplet energy gap. − In the mean-field approximation for the interaction between quantum spin-1/2 dimers, the susceptibility is − χ = k B C k B T ( 3 4 + 1 4 exp false( 2 β | J normalD | false) ) + 2 J F ′ where it is assumed that J D < 0, C is the Curie–Weiss constant, and J F false′ .25em = ∑ j ′ J i j with J D excluded.…”