Spin transition in Gd$_3$N@C$_{80}$, detected by low-temperature on-chip SQUID technique

L. Chen; E. E. Carpenter; C. S. Hellberg; H. C. Dorn; M. Shultz; W. Wernsdorfer; I. Chiorescu

doi:10.1063/1.3536514

paper

Spin transition in Gd $_{3}$ N@C $_{80}$ , detected by low-temperature on-chip SQUID technique

arXiv:1009.0440 · doi:10.1063/1.3536514

Abstract

We present a magnetic study of the Gd $_{3}$ N@C $_{80}$ molecule, consisting of a Gd-trimer via a Nitrogen atom, encapsulated in a C $_{80}$ cage. This molecular system can be an efficient contrast agent for Magnetic Resonance Imaging (MRI) applications. We used a low-temperature technique able to detect small magnetic signals by placing the sample in the vicinity of an on-chip SQUID. The technique implemented at NHMFL has the particularity to operate in high magnetic fields of up to 7 T. The Gd $_{3}$ N@C $_{80}$ shows a paramagnetic behavior and we find a spin transition of the Gd $_{3}$ N structure at 1.2 K. We perform quantum mechanical simulations, which indicate that one of the Gd ions changes from a $^{8} S_{7/2}$ state ( $L = 0, S = 7/2$ ) to a $^{7} F_{6}$ state ( $L = S = 3, J = 6$ ), likely due to a charge transfer between the C $_{80}$ cage and the ion.

Spin transition in Gd3​N@C80​, detected by low-temperature on-chip SQUID technique

Abstract

References in corpus (6)

Spin transition in Gd $_{3}$ N@C $_{80}$ , detected by low-temperature on-chip SQUID technique