Observation of S  = 1/2 quasi-1D magnetic and magneto-dielectric behavior in a cubic SrCuTe2O6

• Published in: Journal of physics. Condensed matter 2015-10, Vol.27 (42), p.426001-426001
• Main Authors: Koteswararao, B, Panda, S K, Kumar, R, Yoo, Kyongjun, Mahajan, A V, Dasgupta, I, Chen, B H, Kim, Kee Hoon, Chou, F C
• Format: Article
• Language: English
• Subjects: 1/2 uniform chains; frustration; magneto-dielectric behavior; SrCuTe
• ISSN: 0953-8984; 1361-648X
• DOI: 10.1088/0953-8984/27/42/426001

We investigate the magnetic, thermal, and dielectric properties of SrCuTe2O6, which is isostructural to PbCuTe2O6, a recently found, Cu-based 3D frustrated magnet with a corner-sharing triangular spin network having dominant first and second nearest neighbor (nn) couplings (Koteswararao et al 2014 Phys. Rev. B 90 035141). Although SrCuTe2O6 has a structurally similar spin network, the magnetic data exhibit the characteristic features of a typical quasi-1D magnet, which mainly resulted from the magnetically dominant third nn coupling, uniform chains. The magnetic properties of this system are studied via magnetization (M), heat capacity (Cp), dielectric constant (), and measurements along with ab initio band structure calculations. The magnetic susceptibility data show a broad maximum at 32 K and the system orders at low temperatures K and K, respectively. The analysis of the data gives an intra-chain coupling, , to be about     −  42 K with non-negligible frustrated inter-chain couplings ( and ). The hopping parameters obtained from the LDA band structure calculations also suggest the presence of coupled uniform chains. The observation of simultaneous anomalies in at and suggests the presence of a magneto-dielectric effect in SrCuTe2O6. A magnetic phase diagram is also built based on the M, Cp, and results.