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Physics of Solids Under High Pressure Using Nuclear Probes

The second international symposium `Physics of Solids Under High Pressure Using Nuclear Probes' (HPNP'04) was held at the Kardinal-Schulte Haus, close to Cologne, Germany (20–24 July 2004). This meeting followed the successful concept of the first symposium HPNP'99 which was held at the same place. The main goal of HPNP'04 was to enhance the significance of high pressure as a parameter for the investigation of a variety of solid state phenomena, using different spectroscopic methods. The organizer was delighted by the enthusiasm shown by the 70 symposium participants from 13 countries. More than 60% of the participants came to Cologne from outside Germany. Their work was shown in 60 presentations, consisting of 31 invited talks and 28 poster contributions. These include correlated oxides, f-electron systems, quantum phase transitions, unconventional superconductivity as well as structural phase transitions and lattice dynamics. A major part of these presentations has found their way into this special issue of Journal of Physics: Condensed Matter. The order in which presentations were made at the symposium is followed in these proceedings. I am indebted to the German private foundation `Wilhelm und Else Heraeus-Stiftung' for generous financial support without which this symposium could not have taken place. Thanks are also due to all authors and referees for their contribution to the high scientific quality of these proceedings. I would like to express my deep gratitude to my PhD student, Roman Lengsdorf, who undertook the roll of secretary for this symposium. His assistance in the production of these proceedings is greatly aappreciated. Finally, I would like to thank all symposium participants whose enthusiasm and scientific interest made this symposium possible.