Kazumi Maki and collaborators are working on unconventional superconductors (or nodal superconductors), unconventional charge density wave (UCDW) and unconventional spin density wave (USCD). It is now well established both the hole doped and the electron doped HTSC are d-wave superconductors. More recently, from the study of the angular dependent magnetothermal conductivity in the vortex state in nodal superconductors, the nodal directions in Delta(k) in Sr2RuO4, CeCoIn5, kappa-(ET)2Cu(NCS)2 and more recently YNi2B2C are determined. As to UCDW and USDW they exhibit clear thermodynamic signals as conventional CDW and SDW. However no clear signal in the local charge or the local spin is visible. So they are called the condensates with hidden order parameter. With Balazs Dora and Attila Virosztek we have discovered that UCDW describes very consistently the low temperature phase in alpha-(ET)2KHg(NCS)4. Likewise, the AF phase in URu2Si2 and the pseudogap phase in HTSC are very likely USDW. Indeed there appears many organic molecular conductors and heavy fermion conductors with UCDW or USDW condensate.

B.S. Physics, Kyoto University, Kyoto, Japan, 1959; D.S. Physics, Kyoto University, Kyoto, Japan, 1964.

Department of Physics & Astronomy
Office: SSC 215C
Tel: (213) 740-8405
Fax: (213) 740-6653
kmaki@usc.edu

Personal page:

http://physics.usc.edu/~kmaki/