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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 16: Crystal Structure Defects / Real Structure / Microstructure I

KFM 16.6: Talk

Wednesday, March 20, 2024, 16:50–17:10, E 124

Evaluation of structural phase transition in spin-1/2 frustrated Dirac-magnon antiferromagnet: Cu₃TeO₆ — •Isha Isha¹, M. Isobe², N. P. Lalla¹, and Arvind Kumar Yogi¹ — ¹UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore-452001, India — ²Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, D-70569 Stuttgart, Germany

We report the structural and physical properties of spin-1/2 (3d⁹ as Cu²⁺) ultra-high quality single-crystals of Cu₃TeO₆. The susceptibility measured over single-crystal is showing quasi-1D behavior as confirmed by using Bonner-Fisher spin-1/2 1D chain model in the temperature range from 20 K to 200 K. From magnetic susceptibility we deduce the nearest neighbor (NN) antiferromagnetic coupling constant J ∼ 113.2 K. We show that this compound made of weakly coupled infinite chains of CuO₆ octahedral. Moreover, we have performed detailed x-ray diffraction technique to elucidate a structural-phase transition and our detailed analysis suggests an isostructural transition, resulting in an unusually temperature dependence of cubic cell parameter and atomic displacement below the second-order phase transition (T_N∼ 61 K) which indicates strong magneto-elastic coupling. Our results reveal yet another interesting facet of the magneto-elastic coupling in the Cu₃TeO₆ spin-web lattice.

Keywords: Structural phase transition; Quantum Materials; X-ray diffraction; Antiferromagnetism; Symmetry-breaking