A 10T Superconducting Magnet for Magneto Structural and
Magneto-Electronic Research and Education
Investigators:
Trevor A. Tyson, New Jersey Institute of Technology (tyson@adm.njit.edu,
tel: 973-642-4681)
Joseph I. Budnick, University of Connecticut (budnick@phys.uconn.edu,
tel: 860-486-5541)
Mark C. Croft, Rutgers University (croft@physics.rutgers.edu,
tel: 908-445-2524)
Vincent G. Harris, Naval Research Laboratory (harris@anvil.nrl.navy.mil,
tel: 202-767-6249)
Chi-Chang Kao, National Synchrotron Light Source, BNL (kao@bnl.gov,
tel: 631-344-4494)
Funding
Source: National Science Foundation, Instrumentation for Materials
Research Grant DMR
0083189
Contacts for Access: Trevor A. Tyson, New Jersey Institute of Technology (tyson@adm.njit.edu,
tel: 973-642-4681)
Chi-Chang Kao, National Synchrotron Light Source, BNL (kao@bnl.gov, tel: 631-344-4494)
Abstract for Initial Experiments
Local, non-periodic, structural distortions play a key role in determining the properties of complex metals such as transition-metal oxide (TMO) systems. In the case of the doped LaMnO3 magnetoresistive (manganite or CMR) system, a strong dependence of the transport properties on the magnetic field is found in addition to the temperature dependent changes in local structure. Like the manganites, the 4d ruthenate TMO system also exhibit interesting charge transport and spin correlations including the possible coexistence of superconductivity and ferromagnetism on the microscopic level. The exact details of this coexistence are not understood. It is essential to probe the local magnetic moment on the Ru and O sites as well as to explore the field induced local structural changes.
This magnet is being used to study the intriguing lattice-transport coupling and local magnetic moments in complex oxides. The magnet gives experimenters the capability of measuring x-ray absorption and magnetic x-ray dichroic spectra in varying magnetic fields. Utilizing the plane polarized synchrotron radiation from the National Synchrotron Light Source at Brookhaven National Laboratory (where the instrument is based), one can examine structural deformations parallel to and transverse to the applied magnetic field and correlate structural deformations with r(H,T). In addition, one can probe the local magnetic moments on the transition metal sites with circular polarized radiation (x-ray magnetic circular dichroism). Elucidation of the lattice-magnetic field correlations and field dependent local moments will assist in placing constraints on possible theoretical models for these materials. For X-ray absorption measurements, the magnet will be stationed at the X23B beamline and is available to general users of the X11A, X19A and X21A, in addition to X23B general users. For magnetic x-ray circular dichroism measurements, the magnet can moved to UV line U4B and X-ray lines X13A and X13B. At all levels of the research conducted with this magnet, undergraduate and graduate students will be involved. Students will be involved in laboratory courses which utilize this magnet and will take part in research utilizing it.
Set-Up Pictures (with duplicates)
Initial Magnet Test Pictures (with duplicates)
Magnet Installed at NSLS Beamline X19A for
Experiment (Tyson and graduate student Tao Wu)
