Ph.D., 1984, Northwestern
Experimental Condensed Matter Physics
Professor Shivaram is a condensed matter experimentalist whose research spans a wide variety of key areas. His scientific career started with work on the quantum fluid, liquid 3He, a strongly correlated Fermi system, focusing on its acoustic properties in the superfluid state. He has stayed with the theme of strongly correlated Fermi systems investigating their superconducting and magnetic properties at very low temperatures and high magnetic fields. A significant portion of his work has focused on the thermodynamic, electromagnetic and acoustic properties of correlated electron systems based on rare earth and actinide elements, called the heavy electron metals. Here, his group was the first to map the complex three dimensional pressure-temperature-magnetic field phase diagram in an unconventional superconductor, UPt3. In recent work he has employed magnetometry as well as sensitive ultrasound measurements to establish the universal properties of strongly correlated metamagnets. Through angle dependent studies he also established the co-existence of a metamagnet with other exotic magnetic phases at a triple point in magnetic fields close to 30 Tesla. Exotic magnetic states, such as quantum spin liquids, have also been explored in recent experiments in a-RuCl3, a proximate Kitaev magnet.
His experimental projects are carefully chosen, and almost always have contributed to major theoretical insights.
Professor Shivaram also develops new experimental tools and has invented MEMS based methods for magnetometry of condensed matter and to monitor nanostructures in real time during growth.
He has also contributed to studies of hydrogen absorption at the molecular level in novel organo-metallic complexes which are made in his laboratory and which hold the world record for gravimetric absorption.
1."Anomalous and anisotropic nonlinear susceptibility in the proximate Kitaev magnet α-RuCl3", Ludwig Holleis, Joseph C. Prestigiacomo, Zhijie Fan, Satoshi Nishimoto, Michael Osofsky, Gia-Wei Chern, Jeroen van den Brink & B. S. Shivaram, Nature Physics Journal Quantum Materials, 6, Article number: 66, (2021). Open Access
2."An Effective Spin Hamiltonian Approach to Heavy Electron Metamagnetism", P. Kumar, B. S. Shivaram and V. Celli, Philosophical Magazine, 100 (10), 1301-1323, (2020). Link
3."Machine learning guided design of single-molecule magnets for magnetocaloric applications", L Holleis, B.S. Shivaram, P.V. Balachandran, Applied Physics Letters ,114, 222404, (2019). Link AIP Scilight
4. "Field Angle Tuned Metamagnetism and Lifschitz Transitions in UPt3", B.S. Shivaram, L. Holleis, V.W. Ulrich, J. Singleton, and M. Jaime, Scientific Reports, 9, 8162, (2019). Open Access
5. "Nonlinear Pauli susceptibilities in Sr3Ru2O7 and universal features of itinerant metamagnetism", B. S. Shivaram, Jing Luo, Gia-Wei Chern, Daniel Phelan, R. Fittipaldi and A. Vecchione, Physical Review, B, 97, 100403 (Rapid Communication) (2018). Link
6. "Linear and Nonlinear Magnetic Response of an f-electron based Single Molecule Magnet", B.S. Shivaram, Eric Colineau, J. Griveau, Pradeep Kumar, V. Celli, J. Phys. Condens Matter., 29, 095805, (2017). Link
7. "High Field Ultrasound Measurements in UPt3 and the Single Energy Scale Model of Metamagnetism”, B.S. Shivaram, V.W. Ulrich, P. Kumar and V. Celli, Phys. Rev. B, 91, 115110, (2015). Link
8. "Non Linear Susceptibility from High DC Field Torque Magnetometry”, B.S. Shivaram, Review of Scientific Instruments, 85, 046107, (2014). Link
9. "Metamagnetism and the Fifth Order Susceptibility in UPt3", B.S. Shivaram, Brian Dorsey, D.G. Hinks and Pradeep Kumar, Phys. Rev. B, 89, 161108 (Rapid Communication), (2014). Link
10. "Universality in the Nonlinear Magnetic Response of Strongly Correlated Metals", B.S. Shivaram, D.G. Hinks, M.B. Maple and P. Kumar, Phys. Rev., B 89, 241107(Rapid Communication), (2014). Link
Other Significant Publications:
1. "High Capacity Hydrogen Absorption in Transition Metal Ethylene Complexes Observed via Nanogravimetry”, A.B. Phillips and B.S. Shivaram, Physical Review Letters, 100, 105505, (2008). Link
2. "Tetracritical Points and the Superconducting Phases of UPt3: Uniaxial Pressure Effects", M. Boukhny, G.L. Bullock, B.S. Shivaram, D.G. Hinks, Physical Review Letters, 73, 1707, (1994). Link
3. "Lower and upper critical fields in the heavy electron superconductor UPt3", B.S. Shivaram, J.J. Gannon Jr, D.G. Hinks Physical Review Letters, 63, 1723, (1989). Link
4. "Anisotropy of Transverse Sound in the Heavy-Fermion Superconductor UPt3", B.S.Shivaram, Y.H.Jeong, T.F. Rosenbaum, D.G. Hinks, Physical review letters, 56, 1078, (1986). Link
5. "Unusual Angular and Temperature Dependence of the Upper Critical Field in UPt3,", B.S. Shivaram, T.F. Rosenbaum, D.G. Hinks, Physical Review Letters, 57, 1259, (1986). Link