Bellave Shivaram

Ph.D., 1984, Northwestern
Associate Professor

Experimental Condensed Matter Physics

Research Interests

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.  His recent work has focused on the thermodynamic, electromagnetic and acoustic properties of a class of such correlated electronic 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.  More recently he has employed magnetometry as well as sensitive ultrasound measurements to establish the universal properties of strongly correlated metamagnets. The proximity of such metamagnetic states, to other exotic quantum states such spin liquids, have also been explored in recent experiments on a-RuCl3, a leading 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.

Selected Publications

Recent Publications:

1."An E ffective Spin Hamiltonian Approach to Heavy Electron Metamagnetism", P. Kumar, B. S. Shivaram and V. Celli, accepted Philosophical Magazine, 2020.

2."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).

3. "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).

4. "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).

5. "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).

6. "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).

7. "Non Linear Susceptibility from High DC Field Torque Magnetometry”, B.S. Shivaram, Review of Scientific Instruments, 85, 046107, (2014).

8. "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).

9. "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).

10. "Vibrational spectra of Ti:C2H4(nH2) and Ti:C2H4(nD2) (n=1-5) complexes and the equilibrium isotope effect: Calculations and experiment”, Nitin Wadnerkar, Vijayanand Kalamse, A.B. Phillips, B.S. Shivaram, and Ajay Chaudhari, International J. of Hydrogen Energy, 36, 9727, (2011).

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).

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).

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).

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).

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).

6. "Resolution of New Structure in the Collective-Mode Spectrum of 3He-B", B.S. Shivaram, M.W. Meisel, B.K. Sarma, D.B. Mast, W.P. Halperin, J.B. Ketterson, Physical Review Letters, 49, 1646, (1982).

Publications on Arxiv:

1."Magneto Acoustic Quantum Oscillations in High Fields and the Fermi Surface of UPt3", Ludwig Holleis, V. W. Ulrich, B. S. Shivaram , 2019.

3."Observation of a Zeeman Induced Lifshitz Transition in URu2Si2", B. S. Shivaram, V. W. Ulrich, D. G. Hinks, 2014.

4."The Superconducting Phases of URu2Si2: Longitudinal Sound Velocity Measurements", B. S. Shivaram, V. W. Ulrich, D. G. Hinks, 2014.

News Items

Abstract: We present a data-driven approach to predict entropy changes (ΔS) in small magnetic fields in single-molecule magnets (SMMs) relevant to their ......More >
From UVaToday:(A University of Virginia-led team) discovered that the magnetic effect of apparently all metamagnets is that it is non-linear. When these metamagnets are placed in an initial ......More >

Honors

Alfred P. Sloan Foundarion Fellow [1988]