2019_EJRNL_PP_YASIR_IQBAL_PP.pdf
Terbatas Ratnasari
» ITB
Terbatas Ratnasari
» ITB
We investigate the quantum Heisenberg model on the pyrochlore lattice for a generic spin S in the
presence of nearest-neighbor J1 and second-nearest-neighbor J2 exchange interactions. By employing the
pseudofermion functional renormalization group method, we find, for S ¼ 1=2 and S ¼ 1, an extended
quantum-spin-liquid phase centered around J2 ¼ 0, which is shown to be robust against the introduction of
breathing anisotropy. The effects of temperature, quantum fluctuations, breathing anisotropies, and a J2
coupling on the nature of the scattering profile, and the pinch points, in particular, are studied. For the
magnetic phases of the J1-J2 model, quantum fluctuations are shown to renormalize phase boundaries
compared to the classical model and to modify the ordering wave vectors of spiral magnetic states, while no
new magnetic orders are stabilized.