ChemInform Abstract: Structure and Physical Properties of the Layered Pnictide‐Oxides: (SrF)2Ti2Pn2O (Pn: As, Sb) and (SmO)2Ti2Sb2O.

Liu, R. H.; Song, Yian; Li, Q. J.; Ying, J. J.; Yan, Y. J.; Yang, He; Chen, X. H.

doi:10.1002/chin.201032019

Cited by 1 publication

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“…Along this line, materials containing M 2 O square planes, where M stands for 3d-transition elements such as Ti [3][4][5][6][7] , Fe [8][9][10][11][12] , Co 13 , Mn 14 and V 15 , have attracted much interest [16][17][18] . The M 2 O planes, being of an anti-CuO 2 -type (the cations and anions exchange their sites) structure, are sandwiched by X layers, forming a unique structural motif M 2 OX 2 with mixed anions.…”

Section: Introductionmentioning

confidence: 99%

Weak metal-metal transition in the vanadium oxytelluride Rb$_{1-δ}$V$_2$Te$_2$O

Ablimit,

Sun,

Jiang

et al. 2018

Preprint

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We report the synthesis, crystal structure, physical properties, and first-principles calculations of a vanadium-based oxytelluride Rb 1−δ V2Te2O (δ ≈ 0.2). The crystal structure bears two-dimensional V2O square nets sandwiched with tellurium layers, mimicking the structural motifs of cuprate and iron-based superconductors. The material exhibits metallic conductivity with dominant hole-type charge carriers. A weak metal-to-metal transition takes place at ∼100 K, which is conformably characterized by a slight kink/hump in the electrical resistivity, jumps in the Hall and Seebeck coefficients, a minute drop in the magnetic susceptibility, and a small peak in the heat capacity. Neither Bragg-peak splitting nor superlattice reflections can be detected within the resolution of conventional x-ray diffractions. The band-structure calculations show that V-3d orbitals dominate the electronic states at around Fermi energy where a dyz/dxz orbital polarization shows up. There are three Fermi-surface sheets that seem unfavorable for nesting. Our results suggest an orbital or spin-density-wave order for the low-temperature state and, upon suppression of the competing order, emergence of superconductivity could be expected.

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