| Autor: |
Moovendaran K; Institute of Physics, Academia Sinica, Taipei 11529, Taiwan., Kalaivanan R; Institute of Physics, Academia Sinica, Taipei 11529, Taiwan., Muthuselvam IP; Department of Physics (MMV), Banaras Hindu University, Varanasi, Uttar Pradesh 221005, India., Babu KR; Department of Physics, National Taiwan University, Taipei 10617, Taiwan.; Physics Division, National Center for Theoretical Sciences, Hsinchu 30013, Taiwan., Lee S; Department of Physics, Chung-Ang University, Seoul 06974, Republic of Korea., Lee CH; Department of Physics, Chung-Ang University, Seoul 06974, Republic of Korea., Bayikadi KS; Institute of Physics, Academia Sinica, Taipei 11529, Taiwan., Dhenadhayalan N; Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan., Chen WT; Center for Condensed Matter Sciences and Center of Atomic Initiative for New Materials, National Taiwan University, Taipei 10617, Taiwan.; Taiwan Consortium of Emergent Crystalline Materials, Ministry of Science and Technology, Taipei 10622, Taiwan., Wang CW; National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan., Lai YC; National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan., Iizuka Y; Institute of Earth Sciences, Academia Sinica, Nankang, Taipei 11529, Taiwan., Choi KY; Department of Physics, Sungkyunkwan University, Suwon 16419, Republic of Korea., Nalbandyan VB; Chemistry Faculty, Southern Federal University, Rostov-on-Don 344090, Russia., Sankar R; Institute of Physics, Academia Sinica, Taipei 11529, Taiwan. |
| Abstrakt: |
We report the successful growth of high-quality single crystals of Sr 0.94 Mn 0.86 Te 1.14 O 6 (SMTO) using a self-flux method. The structural, electronic, and magnetic properties of SMTO are investigated by neutron powder diffraction (NPD), single-crystal X-ray diffraction (SCXRD), thermodynamic, and nuclear magnetic resonance techniques in conjunction with density functional theory calculations. NPD unambiguously determined octahedral (trigonal antiprismatic) coordination for all cations with the chiral space group P 312 (no. 149), which is further confirmed by SCXRD data. The Mn and Te elements occupy distinct Wyckoff sites, and minor anti-site defects were observed in both sites. X-ray photoelectron spectroscopy reveals the existence of mixed valence states of Mn in SMTO. The magnetic susceptibility and specific heat data evidence a weak antiferromagnetic order at T N = 6.6 K. The estimated Curie-Weiss temperature θ CW = -21 K indicates antiferromagnetic interaction between Mn ions. Furthermore, both the magnetic entropy and the 125 Te nuclear spin-lattice relaxation rate showcase that short-range spin correlations persist well above the Néel temperature. Our work demonstrates that Sr 0.94(2) Mn 0.86(3) Te 1.14(3) O 6 single crystals realize a noncentrosymmetric triangular antiferromagnet. |
