Evidence for pressure induced unconventional quantum criticality in the coupled spin ladder antiferromagnet C₉H₁₈N₂CuBr₄.

ABSTRACT: Quantum phase transitions in quantum matter occur at zero temperature between distinct ground states by tuning a nonthermal control parameter. Often, they can be accurately described within the Landau theory of phase transitions, similarly to conventional thermal phase transitions. However, this picture can break down under certain circumstances. Here, we present a comprehensive study of the effect of hydrostatic pressure on the magnetic structure and spin dynamics of the spin-1/2 ladder compound C₉H₁₈N₂CuBr₄. Single-crystal heat capacity and neutron diffraction measurements reveal that the Néel-ordered phase breaks down beyond a critical pressure of P_c ∼ 1.0 GPa through a continuous quantum phase transition. Estimates of the critical

SUBMITTER: Hong T 

PROVIDER: S-EPMC9163114 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature