Abstract
Abstract Recent studies on the kagome lattice YCu3(OH)6+x X3-x (X = (Cl, Br)) have show promising evidence for the existence of a Dirac quantum spin liquid. We have synthesized a new compound LuCu3(OH)6Br2[Br x (OH)1-x ], which has two types of structures with two different space group, P 3 m1 and R 3. Type-I sample with the space group of P 3 m1 has undistorted Cu2+ kagome planes and orders magnetically below about 1.5 K. Type-II has a larger unit cell with the space group of R 3 and distorted kagome planes. No magnetic ordering is observed, and the low-temperature specific heat behaves like the Dirac quantum spin liquid, including the quadratic temperature dependence at zero field and an additional linear-T term under magnetic fields. By comparing the structures with YCu3(OH)6+x X3-x (X = Cl, Br), we show that the QSL ground state may have a deep connection with the J ⎔ - J - J' Heisenberg model on the kagome lattice.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call