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11 papers
A broadband pulse amplifier for Joule heating experiments in diamond anvil cells
Zachary M. Geballe, Joseph Lai, Michael J. Walter
Decades of measurements of the thermophysical properties of hot metals show that pulsed Joule heating is an effective method to heat solid and liquid metals that are chemically rea…
A diamond anvil microassembly for Joule heating and electrical measurements up to 150 GPa and 4000 K
Zachary M. Geballe, Suzy M. Vitale, Jing Yang +3
When diamond anvil cell (DAC) sample chambers are outfitted with both thermal insulation and electrodes, two cutting-edge experimental methods are enabled: Joule heating with spect…
Spectroradiometry with sub-microsecond time resolution using multianode photomultiplier tube assemblies
Zachary M. Geballe, Francesca Miozzi, Chris F. Anto +3
Accurate and precise measurements of spectroradiometric temperature are crucial for many high pressure experiments that use diamond anvil cells or shock waves. In experiments with…
Imaging the Meissner effect and flux trapping in a hydride superconductor at megabar pressures using a nanoscale quantum sensor
Prabudhya Bhattacharyya, Wuhao Chen, Xiaoli Huang +24
By directly altering microscopic interactions, pressure provides a powerful tuning knob for the exploration of condensed phases and geophysical phenomena. The megabar regime repres…
A latent heat method to detect melting and freezing of metals at megabar pressures
Zachary M. Geballe, Nicholas Holtgrewe, Amol Karandikar +3
The high-pressure melting curves of metals provide simple and useful tests for theories of melting, as well as important constraints for the modeling of planetary interiors. Here,…
Insulator-metal transition in liquid hydrogen and deuterium
Shuqing Jiang, Nicholas Holtgrewe, Zachary M. Geballe +4
The insulator-to-metal transition in dense fluid hydrogen is an essential phenomenon to understand gas giant planetary interiors and the physical and chemical behavior of highly co…
Helium-hydrogen immiscibility at high pressures
Yu Wang, Xiao Zhang, Shuqing Jiang +6
Hydrogen and helium are the most abundant elements in the universe and they constitute the interiors of gas giant planets. Thus, their equations of states, phase, chemical state, a…
Evidence for superconductivity above 260 K in lanthanum superhydride at megabar pressures
Maddury Somayazulu, Muhtar Ahart, Ajay K Mishra +5
Recent predictions and experimental observations of high Tc superconductivity in hydrogen-rich materials at very high pressures are driving the search for superconductivity in the…
Modulation calorimetry in diamond anvil cells II: Joule-heating design and prototypes
Zachary M. Geballe, Viktor V. Struzhkin, Andrew Townley +1
Part I shows that quantitative measurements of heat capacity are theoretically possible inside diamond anvil cells via high-frequency Joule heating (100 kHz to 10 MHz), opening up…
Modulation calorimetry in diamond anvil cells I: heat flow models
Zachary M. Geballe, Gilbert W. Collins, Raymond Jeanloz
Numerical simulations of heat transport in diamond anvil cells reveal a possibility for absolute measurements of specific heat via high-frequency modulation calorimetry. Such exper…
Comment on A First-order Phase Transition to Metallic Hydrogen
Alexander F. Goncharov, Zachary M. Geballe
A recent paper by Zaghoo et al. presents optical data at high-pressure and high-temperature and interprets the data as evidence for a first-order phase transition to metallic hydro…