We study the structural, electronic and magnetic properties of select quantum materials, especially complex oxides. This materials class embodies many of the most fundamental contemporary questions pertaining to the quantum behavior of interacting electrons. Our research involves bulk single crystal growth, neutron and X-ray scattering as well as charge transport and nonlinear magnetic response experiments, and we engage in extensive collaborations with experts in the use of complementary experimental techniques. Most of our work is supported by the Department of Energy, Office of Basic Energy Sciences through the University of Minnesota Center for Quantum Materials. In addition, through a NSF MRSEC grant, we are using synchrotron X-rays to study electrostatically doped films of complex oxides, such as cuprates, cobaltites and titanates. Learn more.
Selected results (since 2007):
- Hole pocket-driven superconductivity and its universal features in the electron-doped cuprates
- Unusual behavior of cuprates explained by heterogeneous charge localization
- Emergence of superconductivity in the cuprates via a universal percolation process
- Percolative nature of the dc paraconductivity in the cuprate superconductors
- Universal superconducting precursor regime in perovskite-based oxides
- Ion-Gel-Gating-Induced Oxygen Vacancy Formation in Epitaxial La0.5Sr0.5CoO3-δ Films from in operando X-ray and Neutron Scattering
- Hidden Fermi-liquid charge transport in the antiferromagnetic phase of the electron-doped cuprate superconductors
- Commensurate antiferromagnetic excitations as a signature of the pseudogap in the tetragonal high-Tc cuprate HgBa2CuO4+δ
- Charge order and its connection with Fermi-liquid charge transport in a pristine high-Tc cuprate
- In-Plane Magnetoresistance Obeys Kohler’s Rule in the Pseudogap Phase of Cuprate Superconductors
- Universal quantum oscillations in the underdoped cuprate superconductors
- Universal sheet resistance and revised phase diagram of the cuprate high-temperature superconductors
- Spectroscopic Evidence for a Fermi liquid-like energy and temperature dependence of the relaxation rate in the pseudogap phase of the cuprates
- Unusual magnetic order in the pseudogap region of the superconductor HgBa2CuO4+δ
- Spin correlations in the electron-doped high-transition-temperature superconductor Nd2-xCexCuO4+δ
