5 papers
Phonon dynamics in Chromium under pressure: absence of phonon criticality at the approach of the quantum critical point
P. Rodière, J. E. Lorenzo, Q. N. Meier +2
Fermi surface nesting is key to understanding the origin of the itinerant antiferromagnetic spin density wave in chromium. This magnetic order is accompanied by a charge-density wa…
Pressure-Driven Structural Transitions without a Displacive Charge-Density Wave in LaSmNiO
J. Huang, Sitaram Ramakrishnan, P. Rodière +7
We investigated the structural properties of bilayer nickelate LaSmNiO as a function of pressure and temperature. At ambient conditions, we show that the material cryst…
Tracing the horizon of tetragonal-to-monoclinic distortion in pressurized trilayer nickelate La4Ni3O10
Sitaram Ramakrishnan, Yingzheng Gao, Valerio Olevano +18
The crux of understanding the superconducting mechanism in pressurized Ruddlesden-Popper nickelates hinges on elucidating their structural phases. Under ambient conditions, the tri…
Evidence of electronic instability driven structural distortion in the nodal line semimetal CoSn
Suman Nandi, Bishal Maity, Shovan Dan +8
Understanding the mechanisms that drive spontaneous rotational symmetry breaking in correlated electron systems is a central challenge in condensed matter physics. Although such sy…
An underdog story: Re-emergence of a polar instability at high pressure in KNbO3
Mohamad Baker Shoker, Sitaram Ramakrishnan, Boris Croes +12
Ferroelectricity in perovskites is known to be suppressed by a moderate hydrostatic pressure. The notion that a polar instability should reappear in a higher pressure regime is wel…