Machine learning in electronic-quantum-matter imaging experiments
Nature Springer Nature 570:7762 (2019) 484-490
Visualizing Electronic Quantum Matter
Chapter in Springer Handbook of Microscopy, Springer Nature (2019) 1369-1390
Common glass-forming spin-liquid state in the pyrochlore magnets Dy2Ti2 O7 and Ho2Ti2 O7
Physical Review B 98:21 (2018)
Abstract:
漏 2018 American Physical Society. Despite a well-ordered pyrochlore crystal structure and strong magnetic interactions between the Dy3+ or Ho3+ ions, no long-range magnetic order has been detected in the pyrochlore titanates Ho2Ti2O7 and Dy2Ti2O7. To explore the actual magnetic phase formed by cooling these materials, we measure their magnetization dynamics using toroidal, boundary-free magnetization transport techniques. We find that the dynamical magnetic susceptibility of both compounds has the same distinctive phenomenology, which is indistinguishable in form from that of the dielectric permittivity of dipolar glass-forming liquids. Moreover, Ho2Ti2O7 and Dy2Ti2O7 both exhibit microscopic magnetic relaxation times that increase along the super-Arrhenius trajectories analogous to those observed in glass-forming dipolar liquids. Thus, upon cooling below about 2 K, Dy2Ti2O7 and Ho2Ti2O7 both appear to enter the same magnetic state exhibiting the characteristics of a glass-forming spin liquid.Phase diagram of Bi2Sr2CaCu2O8+未 revisited
Nature Communications Springer Nature 9:1 (2018) 5210
Imaging orbital-selective quasiparticles in the Hund鈥檚 metal state of FeSe
Nature Materials Springer Nature 17:10 (2018) 869-874