NMR study on equilateral triangular lattice antiferromagnet Ba2La2CoTe2O12

TL;DR

This study uses 139La-NMR to investigate the magnetic phase transitions and spin structures of the S=1/2 triangular-lattice antiferromagnet Ba2La2CoTe2O12, revealing detailed insights into its ordered states and critical behaviors.

Contribution

It provides the first detailed NMR analysis of Ba2La2CoTe2O12, elucidating its phase transitions and spin structures under varying magnetic fields.

Findings

Identification of a magnetic transition at TN=3.26 K to a 120-degree spin structure.

Observation of phase transition splitting into TN1 and TN2 under magnetic fields above 3T.

Detection of critical divergence in 1/T1 at TN1 indicating long-range order.

Abstract

We report a 139La-NMR study of Ba2La2CoTe2O12, S = 1/2 equilateral triangular-lattice antiferromagnet with easy-plane anisotropy at low temperatures. This compound undergoes a magnetic phase transition at TN = 3.26 K into an ordered state with the 120 degree spin structure. Under magnetic fields above 3T, TN splits into TN1 and TN2, which correspond to the transitions from the paramagnetic phase to the up-up-down (uud) phase and from the uud phase to the triangular coplanar phase, respectively. The NMR spin-lattice relaxation rate 1/T1 exhibits a critical divergence at TN1, indicating the onset of long-range magnetic order. At TN2, the NMR-linewidth measured at 5.4 T exhibits an anomalous decrease, which we attribute to a change in the spin structure from the uud to the triangular coplanar phase.