Ultra spin liquid in Lu3Cu2Sb3O14

ByV. R. Shaginyan

Dec 28, 2021 EPL, Europhysics Letters

EPL, 136 (2021) 17003

Ultra spin liquid in Lu₃Cu₂Sb₃O₁₄

V. R. Shaginyan¹^,2^(a), A. Z. Msezane², S. A. Artamonov¹, G. S. Japaridze² and Y. S. Leevik³

¹ Petersburg Nuclear Physics Institute, NRC Kurchatov Institute – Gatchina, 188300, Russia
² Clark Atlanta University – Atlanta, GA 30314, USA
³ National Research University Higher School of Economics – St.Petersburg, 194100, Russia

^(a) vrshag@thd.pnpi.spb.ru (corresponding author)

Received: 21 July 2021
Accepted: 13 September 2021

Abstract

We analyze recent measurements of C/T, specific heat C divided by temperature T, of a recently observed ultra spin liquid. The measurements are carried out in magnetic fields on the triangular lattice compound . We show that the obtained heat capacity formed by the ultra spin liquid as a function of temperature T vs. magnetic field B behaves very similar to the electronic specific heat of the HF metal and the quantum magnet . We demonstrate that the effective mass of spinon exhibits the universal scaling coinciding with scaling observed in heavy-fermion (HF) metals and in . Based on these observations we conclude that a strongly correlated spin liquid determines the thermodynamic properties of the ultra spin liquid of .