Research interests

• Fundamental and applied superconductivity
• Superconducting thin films
• Self-assembled nanotechnology of pinning centres in superconducting films
• Vortex matter and dynamics in exotic superconductors
• Self-assembled nano-rods and nano-wires from functional oxide materials
• Materials for oxide electronics

Professional development

• Engineering Physicist at Institute for Nuclear Power Reactors, Pitesti, Romania, Radiation Detectors Group, 1985-1987.
• Physicist (1987-1994), Scientific Researcher (Lecturer, 1994-2000), Senior Scientist (grade 3 – Senior Lecturer, 2000-2004; grade 2 – Reader, 2004-2005; grade 1 – Professor, 2005-2007) National Institute for Materials Physics (NIMP), Bucharest, Romania - NATO/Royal Society Postdoctoral Fellow at University of Southampton, United Kingdom, from 01/01/1997 to 31/12/1997.
• NATO/Royal Society Postdoctoral Fellowship at University of Southampton, 1997.
• Visiting Scientist at University of Rome 'Tor Vergata', Italy, 1998-1999.
• Research Fellow of the Science and Technology Agency of Japan (STA), at Nanoelectronics Research Institute of the National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan, 2000-2002.
• Research Officer, Department of Physics, University of Bath, United Kingdom, EPSRC Grant, 2002-2004.
• Visiting Scientist, Institute for Thin Films and Interfaces, Research Centre Jülich, Germany, under a European Science Foundation (THIOX Programme) Exchange Grant, Sept. – Dec 2005
• Invitational Fellowship of the Japan Society for Promotion of Science, Nanoelectronics Research Institute of the National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan, 2006-2007.
• Winner of the EU Marie Curie Excellence Grant with the project “Self-assembled nanotechnology of pinning centres in superconducting thin films, devices and coated conductors.  2007 and 2011

Recent and Selected Publications

1. Magnetically coupled pancake vortex molecules in HgBa2Can-1CunOy (n ≥ 6). A. Crisan, A. Iyo, Y. Tanaka, H. Matsuhata, D.D. Shivagan, P.M. Shirage, K. Tokiwa, T. Watanabe, T.W. Button, J.S. Abell, Phys. Rev. B 77, 144518 (2008).

2. Manipulation of pancake vortices by rotating a Josephson vortex lattice. A. Crisan, S. J. Bending, T. Tamegai, Superconductor Science and Technology, 21, 015017 (2008).

3. Phase diagram of a lattice of vortex molecules in multicomponent superconductors and multilayer cuprate superconductors. Y. Tanaka, D. D. Shivagan, A. Crisan, A. Iyo, P.M. Shirage, K. Tokiwa, T. Watanabe, N. Terada, Superconductor Science and Technology, 21, 085011 (17pp) (2008).

4. Vortex melting line and anisotropy of a Ba2Ca3Cu4O8(O1-yFy)2 multilayered superconductor. D. D. Shivagan, P. M. Shirage, A. Crisan,  Y. Tanaka, A. Iyo, Y. Kodama, K. Tokiwa, T. Watanabe, N. Terada, and N. Hamada, Superconductor Science and Technology, 21, 095002 (7pp) (2008).

5. Pancake-vortex molecules in HgBa2Can-1CunOy (n ≥ 6) superconductors. A. Crisan, A. Iyo, Y. Tanaka, H. Matsuhata, D.D. Shivagan, P.M. Shirage, K. Tokiwa, T. Watanabe, T.W. Button, J.S. Abell, Physica C: Superconductivity and its Applications, 468, 714-717 (2008).

6. Vortex melting line and dimensional crossover in Ba2Can-1CunO2n(O1-y, Fy)2 cuprate superconductors.  D. D. Shivagan, P. M. Shirage, A. Crisan, Y. Tanaka, A. Iyo, Y. Kodama, K. Tokiwa, T. Watanabe, N. Terada, N. Hamada, Physica C: Superconductivity and its Applications, 468, 749-752 (2008).

7. Critical current densities and irreversibility fields of new high-Tc Ba2Ca3Cu4O8(O, F)2 superconductor. P.M. Shirage, D.D. Shivagan, A. Crisan, Y. Tanaka, Y. Kodama, H. Kito and A. Iyo, Physica C: Superconductivity and its Applications, 468, 773-776 (2008).

8. AC-Susceptibility study on vortex-molecule lattice in supermultilayer cuprate HgBa2Can-1CunO2n+2+δ (n = 14). D. D. Shivagan, P. M. Shirage, A. Crisan, Y. Tanaka, A. Iyo, K. Tokiwa, T. Watanabe, N. Terada, Physica C: Superconductivity and its Applications, 468, 1281-1286 (2008).

9. Critical current densities and irreversibility fields of a HgBa2Can_1CunO2n+2+d sample containing n = 6–15 phases. P.M. Shirage, A. Iyo, D.D. Shivagan, A. Crisan, Y. Tanaka, Y. Kodama, H. Kito, Physica C: Superconductivity and its Applications, 468, 1287-1290 (2008).

10. Thermally-induced self-assembling nanotechnology of gold nano-dots on CeO2-buffered sapphire for superconducting films. A. Crisan, R. Woerdenweber, E. Hollmann, R. Kutzner, T.W. Button, J.S. Abell, J. Optoel. Adv. Mater., 10, 1370-1373 (2008).

11. Vortex Dynamics in Hg-based Multi- and Super-Multi-Layered Cuprates. A. Crisan, Y. Tanaka, A. Iyo, D.D. Shivagan , P.M. Shirage, T.W. Button, J.S. Abell, K. Tokiwa, T. Watanabe, Journal of Physics: Conference Series, 97, 012013 (2008).

12. Vortex molecule and i-soliton studies in multilayer cuprate superconductors. D. D. Shivagan, A. Crisan, P.M. Shirage, A. Sundaresan, Y. Tanaka, A. Iyo, K. Tokiwa, T. Watanabe, N. Terada, Journal of Physics: Conference Series, 97, 012212 (2008).

13. Superconductivity at 108 K in the simplest non-toxic double-layer cuprate of Ba2Ca3Cu4O8(O, F)2. P.M. Shirage, D.D. Shivagan, A. Crisan, Y. Tanaka, Y. Kodama, H. Kito and A. Iyo, Journal of Physics: Conference Series, 97, 012163 (2008).

14. Coexistence of Superconductivity and Antiferromagnetism in HgBa2Ca4Cu5Oy: Multi-harmonic Susceptibility and Vortex Dynamics Study. A. Crisan, Y Tanaka, A. Iyo, D. D. Shivagan, P. M. Shirage, K. Tokiwa, T. Watanabe, L. Cosereanu, T. W. Button, J. S. Abell, Phys. Rev. B76, 21, 212508 (2007).

15. Anomalous vortex melting line in the two-component superconductor (Cu, C)Ba2Ca3Cu4O10+. A. Crisan, Y. Tanaka, A. Iyo, L. Cosereanu, K. Tokiwa, T. Watanabe, Phys. Rev. B 74, 184517 (2006).

16. Observation of interacting crossing vortex lattices in Bi2Sr2CaCu2O8+ thin films. A. Crisan, S. J. Bending, S. Popa, Z. Z. Li, H. Raffy, Phys. Rev. B 72, 214509 (2005).

17. Anisotropic vortex channelling in YBa2Cu3O7- thin films with ordered antidot arrays. A. Crisan, A. Pross, D. Cole, S.J. Bending, R. Wördenweber, P. Lahl, E.H. Brandt, Phys. Rev. B 71, 144504 (2005).

18. Vortex melting line and anisotropy of high-pressure-synthesized TlBa2Ca2Cu3O10-y high-temperature superconductor from third-harmonic susceptibility studies. A. Crisan, A. Iyo and Y. Tanaka, Appl. Phys. Lett., 83, 506-508 (2003).

19. Strong reduction of thermally activated flux jumps rate in superconducting thin films by nanodots induced pinning centers. A. Crisan, P. Badica, S. Fujiwara, J.C. Nie, A. Sundaresan, Y. Tanaka and H. Ihara, Appl. Phys. Lett. 80, 3566-3568 (2002).

20. The role of structural disorder in artificially layered high-temperature superconductors. G. Balestrino, A. Crisan, S. Lavanga, P. G. Medaglia, G. Petrocelli, A. A. Varlamov, Phys. Rev. B 60, 10504 - 10507 (1999).

21. Two-Dimensional Vortex and Phase Fluctuations from Current-Voltage Characteristics of Bi2Sr2CaCu2O8+x Films with Various Oxygen Content. G. Balestrino, A. Crisan, D. V. Livanov, E. Milani, M. Montuori, A. A. Varlamov, Phys. Rev. B 51, 9100-9107 (1995).

22. Sputtered nanodots: A costless method for inducing effective pinning centers in superconducting thin films. A. Crisan, S. Fujiwara, J.C. Nie, A. Sundaresan, H. Ihara, Appl. Phys. Lett. 79, 4547-4549 (2001).

23. Transport measurements, vortex dynamics and anisotropy in artificially layered (BaCuO2)2/(CaCuO2)2 superconducting films. A. Crisan, G. Balestrino, S. Lavanga, P. G. Medaglia, E. Milani, Physica C 313, 70-78 (1999).