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Present research interests include high-temperature superconductors, coated conductors made with YBCO superconducting films, optimization of the critical current in these materials, magnetic and structural properties of manganites.

Recent papers include:

• A. D. Christianson, E. A. Goremychkin, R. Osborn, S. Rosenkranz, M. D. Lumsden, C. D. Malliakas, I. S. Todorov, H. Claus, D. Y. Chung, M. G. Kanatzidis, R. I. Bewley & T. Guidi, Unconventional superconductivity in Ba0.6K0.4Fe2As2 from inelastic neutron scattering, Nature 456, 930-932 (18 December 2008)
• M. Iavarone, R. Di Capua, G. Karapetrov, A. E. Koshelev, D. Rosenmann, H. Claus, C. D. Malliakas, M. G. Kanatzidis, T. Nishizaki, and N. Kobayashi, Effect of magnetic impurities on the vortex lattice properties in NbSe2 single crystals, Phys. Rev. B 78, 174518 ( 2008)
• D.G. Hinks, D. Rosenmann, H. Claus, M. Bailey and J.D. Jorgensen, “Large isotope effect in CaC6”, Phys. Rev. B 75, 014509 (2007)
• H. Claus, Beihai Ma, A. P. Paulikas, R. Nikolova, B.W. Veal, Q. X. Jia, U. Welp, and K. E. Gray, Critical current of grain boundaries in YBa2Cu3Ox bicrystal films as function of the oxygen concentration, Phys. Rev. B, 76, 014529 (2007)
• H. Claus, U. Welp, H. Zheng, L. Chen, A. P. Paulikas, B. W. Veal, K. E. Gray, and G. W. Crabtree, Critical current across grain boundaries in melt-textured YBCO rings, Phys. Rev. B 64, 144507-1-9 (2001)
• D. G. Hinks, H. Claus, and J. D. Jorgensen, Reduced total isotope effect and its implication on the nature of superconductivity in MgB2, Nature 411, 457 (2001)
• V. K. Vlasko-Vlasov, H. Claus, U. Welp, K. E. Gray, B. Ma, and U. Balachandran, Improving the ratio of the grain-boundary and bulk critical currents in YBa2Cu3Ox films, Applied Physics Letters 84, 242, (2004)
• H. Claus, K. K. Uprety, B. Ma, A. P. Paulikas, V. K. Vlasko-Vlasov, U.Welp, B. W. Veal, and K. E. Gray, Reversible oxidation and critical current of YBa2Cu3Ox coated conductors, Physica C 416, 1 (2004)
• H. P. Goeckner, H. Claus, and J. S. Kouvel, Vortex-flux anomalies in MgB2 polycrystals, Physica C 418, 93-98 (2005)