title: Observation of S  = 1/2 quasi-1D magnetic and magneto-dielectric behavior in a cubic SrCuTe2O6.
abstract: 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 (C p ), dielectric constant ([Formula: see text]), and measurements along with ab initio band structure calculations. The magnetic susceptibility [Formula: see text] data show a broad maximum at 32 K and the system orders at low temperatures [Formula: see text] K and [Formula: see text] K, respectively. The analysis of the [Formula: see text] data gives an intra-chain coupling, [Formula: see text], to be about  ≈  -  42 K with non-negligible frustrated inter-chain couplings ([Formula: see text] and [Formula: see text]). The hopping parameters obtained from the LDA band structure calculations also suggest the presence of coupled uniform chains. The observation of simultaneous anomalies in [Formula: see text] at [Formula: see text] and [Formula: see text] suggests the presence of a magneto-dielectric effect in SrCuTe2O6. A magnetic phase diagram is also built based on the M, C p , and [Formula: see text] results.
authors.affiliation: School of Physics, University of Hyderabad, Central University PO, Hyderabad 500046, India. CeNSCMR, Department of Physics and Astronomy, and institute of applied physics, Seoul National University, Seoul 151-747, Korea. Center of Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan.
authors.forename: B
authors.initials: B
authors.lastname: Koteswararao
authors.forename: S K
authors.initials: SK
authors.lastname: Panda
authors.forename: R
authors.initials: R
authors.lastname: Kumar
authors.forename: Kyongjun
authors.initials: K
authors.lastname: Yoo
authors.forename: A V
authors.initials: AV
authors.lastname: Mahajan
authors.forename: I
authors.initials: I
authors.lastname: Dasgupta
authors.forename: B H
authors.initials: BH
authors.lastname: Chen
authors.forename: Kee Hoon
authors.initials: KH
authors.lastname: Kim
authors.forename: F C
authors.initials: FC
authors.lastname: Chou