3 research outputs found
An Endohedral Single-Molecule Magnet with Long Relaxation Times: DySc<sub>2</sub>N@C<sub>80</sub>
The magnetism of DySc<sub>2</sub>N@C<sub>80</sub> 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<sup>III</sup> ions. SQUID
magnetometry indicates hysteresis below 6 K, while thermal and nonthermal
relaxation is observed. Dilution of DySc<sub>2</sub>N@C<sub>80</sub> samples with C<sub>60</sub> increases the zero-field 4f electron
relaxation time at 2 K to several hours
Oxygen-Stabilized Rh Adatoms: 0D Oxides on a Vicinal Surface
We have investigated the initial oxidation of the Rh(113) and Rh(223) vicinal surfaces by STM and ab initio simulations. Upon adsorption of small amounts of oxygen, the surface morphology is completely altered. Surprisingly, oxygen-stabilized Rh adatoms can be observed on the (113) facets, with oxide-like electronic properties. We present models of these â0D oxideâ phases and discuss reasons for their stability
Triangular Monometallic Cyanide Cluster Entrapped in Carbon Cage with Geometry-Dependent Molecular Magnetism
Clusterfullerenes
are capable of entrapping a variety of metal
clusters within carbon cage, for which the entrapped metal cluster
generally keeps its geometric structure (e.g., bond distance and angle)
upon changing the isomeric structure of fullerene cage, and whether
the properties of the entrapped metal cluster is geometry-dependent
remains unclear. Herein we report an unusual triangular monometallic
cluster entrapped in fullerene cage by isolating several novel terbium
cyanide clusterfullerenes (TbNC@C<sub>82</sub>) with different cage
isomeric structures. Upon varying the isomeric structure of C<sub>82</sub> cage from C<sub>2</sub>(5) to C<sub>s</sub>(6) and to C<sub>2v</sub>(9), the entrapped triangular TbNC cluster exhibits significant
distortions as evidenced by the changes of TbâCÂ(N) and CâN
bond distances and variation of the TbâCÂ(N)âNÂ(C) angle
by up to 20°, revealing that the geometric structure of the entrapped
triangular TbNC cluster is variable. All three TbNC@C<sub>82</sub> molecules are found to be single-ion magnets, and the change of
the geometric structure of TbNC cluster directly leads to the alternation
of the magnetic relaxation time of the corresponding TbNC@C<sub>82</sub> clusterfullerene