We were all deeply saddened by the recent passing of Jim Jorgensen after a long battle with cancer. In his honor, we organized a Symposium on Opportunities in Neutron Powder Diffraction, that celebrated recent developments in a field to which Jim made so many seminal contributions. It highlighted progress in both science and instrumentation, with contributions from leading scientists and colleagues with whom Jim interacted as a scientist and as a person.

It is impossible to encapsulate a career as long and as varied as Jim's in a short communication. Jim has had an enormous impact on neutron scattering science both within the United States and throughout the world. He was a pioneer in the use of time-of-flight neutron powder diffraction, designing the first instruments at the prototype pulsed neutron sources built in the seventies at Argonne, and then building the first dedicated diffractometers at the Intense Pulsed Neutron Source. He appreciated the power of the time-of-flight technique in enabling diffraction at high pressure and in extreme sample environment, and performed the earliest measurements on magnetic materials. He is perhaps most famous for the first solution of the crystalline structure of the high temperature superconductor, YBa₂Cu₃O₇, becoming one of the 100 most cited physicists for this and related work. However, his main interest was not in solving crystal structures but in understanding the underlying physics that they revealed. His systematic studies of the key structural contributions to high temperature superconductivity were followed by equally penetrating investigations into the physics of CMR manganites and more recently discovered superconductors, such as MgB₂ and the sodium cobaltates. This combination of experimental skill and physical insight gained him tremendous admiration in the condensed matter physics community, illustrated by the award of the prestigious Bertram E. Warren Prize by the American Crystallographic Association in 1991.

He was also an inspiring mentor for many young scientists who came from all around the world in order to work in his group. These scientists ensure that his skills and insights continue to be a vital part of the heritage of the whole scientific community in the US and the world.

Program

Advanced Photon Source, Building 402 Auditorium

8:15am	Continental Breakfast
Morning Session Chair: James Rhyne (Los Alamos National Laboratory)
8:55am	George Crabtree (Argonne National Laboratory) Welcome
9:00am	Jack Carpenter (Argonne National Laboratory) Zing-P′
9:30am	John Parise (State University of New York, Stony Brook) Jorgensen, the SNAP beamline, and the promise of high pressure neutron research
10:00am	David Hinks (Argonne National Laboratory) Structure-property relationships in superconductors: The early years
10:30am	Coffee
11:00am	John Goodenough (University of Texas, Austin) Orbital and magnetic order in the RMnO3 perovskites
11:30am	Bill David (Rutherford Appleton Laboratory) From high temperature superconductivity to hydrogen storage
12:00pm	Gabriel Aeppli (London Centre for Nanotechnology) New challenges in structure-property relations
12:30pm	Lunch
Afternoon Session Chair: Roger Pynn (Indiana University)
1:30pm	Paolo Radaelli (Rutherford Appleton Laboratory) Rietveld in the twilight zone
2:00pm	Dimitri Argyriou (Hahn-Meitner Institute) The beauty of imperfection and the Jorgensen Principle
2:30pm	Ivan Schuller (University of California, San Diego) Quantitative studies in novel thin film materials, or how Jim Jorgensen made a convert out of me
3:00pm	Coffee
3:30pm	Bernhard Keimer (Max Planck Institute, Stuttgart)
4:00pm	Yuichi Shimakawa (Kyoto University) Structural studies on Tl-containing transition metal oxides: collaboration between US and Japan
4:30pm	Sunil Sinha (University of California, San Diego) High-Tc and the coming of age of IPNS
5:00pm	Short presentations and closing remarks
6:30pm	Banquet (Argonne Guest House) Speaker: Thomas Rosenbaum (University of Chicago)

Local Organizing Committee

• Gian Felcher
• Ken Gray
• David Hinks
• Ray Osborn
• Simine Short