Research Interests

To leverage my knowledge of cutting-edge materials and advanced manufacturing to provide innovative techniques and applications that will advance state-of-the-art technologies and make our world more sustainable, energy-efficient, secure and productive.

Ph.D., Physics, Florida State University

M.Sc., Physics, Florida State University

B.S., Physics, Boston College

• “Formation of high purity uranium via laser induced thermal decomposition of uranium nitride.” B. C. Childs, A. A. Martin, A. Perron, E. Moore, Y. S. Idell, T-W. Heo, D. L. Rosas, C. Schaeffer-Cuellar, R. L. Stillwell, P. Soderlind, A. Landa, K. S. Holliday, J.R. Jeffries. Materials & Design, 108706 (2020)
• “Observation of two collapsed phases in CaRbFe₄As₄ .” R. L. Stillwell, X. Wang, L. Wang, D. J. Campbell, J. P. Paglione, S.T. Weir, Y.K. Vohra, J.R. Jeffries. Physical Review B 100, 045152 (2019).
•  “Reduction of uranium triiodide to metal by thermal decomposition.” Y. S. Idell, K. S. Holliday, R. L. Stillwell, J.R. Jeffries. Journal of Radioanalytic and Nuclear Chemistry, 320, 793 (2019).
• “Pressure-dependent intermediate valence behavior of YbNiGa₄ and YbNiIn₄.” Z.E. Brubaker, R. L. Stillwell, P. Chow, Y. Xiao, Y. Kenney-Benson, R. Ferry, D. Popov, S. B. Donald, P. Soderlind, D. Campbell, J. P. Paglione, K. Huang, R. E. Baumbach, R.J. Zieve, J.R. Jeffries. Physical Review B, 98, 214115 (2018).
• “Pressure dependence of Ce valence in CeRhIn₅.” Z.E. Brubaker, R. L. Stillwell, P. Chow, Y. Xiao, C. Kenney-Benson, R. Ferry, Z. Jenei, R.J. Zieve, J.R. Jeffries. Journal of Physics: Condensed Matter, 30, 035601 (2017).
• “Pressure effects in the itinerant antiferromagnetic metal TiAu.” C.T. Wolowiec, C.A. McElroy, J.R Jeffries, R. L. Stillwell, E. Svanidze, J.M. Santiago, E. Morosan, S.T. Weir, Y.K. Vohra, M.B. Maple. Physical Review B, 95, 014414 (2017).
• “The tricritical point of the f-electron antiferromagnet USb₂ driven by high-magnetic fields.” R. L. Stillwell, I-L. Liu, M. Jaime, N. Harrison, J. R. Jeffries, N. P. Butch. Physical Review B, 95, 014414 (2017).
• “Tuning the electronic and the crystalline structure of LaBi by pressure.” F.F. Tafti, M.S. Torikachvili, R. L. Stillwell, B. Baer, E. Stavrou, S.T. Weir, Y.K. Vohra, H-Y. Yang, E.F. McDonnell, S.K. Kushwaha, Q.D. Gibson, R.J. Cava, J.R. Jeffries. Physical Review B, 95 (1), 014507 (2016)
• “Distinct magnetic spectra in the hidden order and antiferromagnetic phases in URu_2-xFe_xSi₂.” N. P. Butch, S. Ran, I. Jeon, N. Kanchanavatee, K. Huang, A. Breindel, M. B. Maple, R. L. Stillwell, Y. Zhao, L. Harriger, J. W. Lynn. Physical Review B, Rapid Communication, 94, 201102(R) (2016).
• “Emergent ferromagnetism and T-linear scattering in USb₂ at high pressure.” J. R. Jeffries, R. L. Stillwell, S. T. Weir, Y. K. Vohra, N. P. Butch. Physical Review B, 93, 184406 (2016).
• “Superconducting Bi₂Te: pressure-induced universality in the (Bi₂)_m(Bi₂Te₃)_n series.” R. L. Stillwell, Z. Jenei, S. T. Weir, Y. K. Vohra, J. R. Jeffries. Physical Review B, 93, 094511 (2016).
• “Strongly coupled electronic, magnetic and lattice degrees of freedom in LaCo5 under pressure.” R. L. Stillwell, J. R. Jeffries, S. K. McCall, J. R. I. Lee, S. T. Weir, Y. K. Vohra. Physical Review B, 92, 174421 (2015).
•  “Pressure-driven Fermi surface reconstruction of chromium.” R. L. Stillwell, D. E. Graf, W. A. Coniglio, T. P. Murphy, E. C. Palm, J. H. Park, D. VanGennep, P. Schlottmann, S. W. Tozer. Physical Review B, 88, 125119 (2013).
• “Transport spectroscopy of symmetry-broken insulating states in bilayer graphene.” J. Velasco, L. Jing, W. Bao, Y. Lee, P. Kratz, V. Aji, M. Bockrath, C.N. Lau, C. Varma, R. Stillwell, D. Smirnov, F. Zhang, J. Jung, A.H. MacDonald. Nature Nanotechnology 7, 156 (2012).
• “Nonmetallic gasket and miniature plastic turnbuckle diamond anvil cell for pulsed magnetic field studies at cryogenic temperatures.” D. E. Graf, R. L. Stillwell, K. M. Purcell, S. W. Tozer. High Pressure Research 31, 533 (2011).
• “Fermi surface of alpha -uranium at ambient pressure.” D. Graf, R. L. Stillwell, T. P. Murphy, J. H. Park, M. Kano, E. C. Palm, P. Schlottmann, J. Bourg, K. N. Collar, J. C. Cooley, J. C. Lashley, J. Willit, S. W. Tozer. Physical Review B, 80(24): p. 241101 (2009).