Nuclear Magnetic Resonance (NMR) studies on quantum phenomena, such as superconductivity, magnetism, multipole order, etc., at high-magnetic fields and low temperatures. Current and recent research subjects are
1. odd-parity superconducting state in heavy-Fermion superconductors
2. exotic superconducting state in low-dimensional systems
3. quantum critical phenomena in f electron systems
4. quantum phenomena in caged compounds
etc.

Main Publications

1. Hideki Tou, Norihiko Tsugawa, Masafumi Sera, Yoshinori Haga, Yoshichika Onuki,"Hyperfine interactions in the heavy fermion superconductor UBe₁₃ : ⁹Be NMR studies", Journal of the Physical Society of Japan, Vol.76 No2  (2007)　024705/1-9.
   
2. Hideki Tou, Kenji Ishida, Yoshio Kitaoka,"Quasiparticle spin susceptibility in heavy-fermion superconductors: An NMR study compared with specific heat results"Journal of the Physical Society of Japan Vol.74, (2005) p.p.1245-1254.
   
3. H. Tou, Y. Maniwa, T. Koiwasaki, and S. Yamanaka: "Unconventional Superconductivity in Electron-doped Layered Li_0.48(THF)_yHfNCl,"Physical Review Letters, Vol.86,(2001), p.p.5775-5778.
   
4. H. Tou, Y. Maniwa, Y. Iwasa, H. Shimoda, T. Mitani: "NMR Evidence for Mott-Hubbard Localization in (NH₃)K₃C₆₀,",Physical Review B, Vol.62, Rapid Communications (2000), p.p.R775-R778.
   
5. H. Tou, Y. Kitaoka, K. Ishida, K. Asayama, N. Kimura, Y. ?Onuki, E. Yamamoto, Y. Haga, K. Maezawa "Nonunitary Spin-Triplet Superconductivity in UPt₃: Evidence from ¹⁹⁵Pt Knight Shift Study,", Physical Review Letters, Vol.80,(1998), p.p.3129-3132.
   
6. H. Tou, Y. Kitaoka, K. Asayama, N. Kimura, Y. Onuki, E. Yamamoto, K. Maezawa: "Odd-Parity Superconductivity with Parallel Spin Paring in UPt₃ -Evidence from ¹⁹⁵Pt KnightShift Study-,"Physical Review Letters, Vol.77, (1996), p.p.1374-1377