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6 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2024

Evolution of magnetism in the magnetic topological semimetal NdSb x Te 2–x+δ

Magnetic topological semimetals LnSbTe (Ln = Lanthanide) have attracted intensive attention because of the presence of interplay between magnetism, topological, and electron correlations depending on the choices of magnetic Ln elements. Recently, varying Sb-Te composition has been found to effectively control the electronic and magnetic states in LnSb x Te 2-x . Here, with this motivation, we report the evolution of magnetic properties with Sb-Te substitution in NdSb x Te 2-x+δ , (0 ≤ x ≤ 1). Our work reveals the interesting non-monotonic change in magnetic ordering temperature with varying composition stoichiometry. In addition, reducing the Sb content x drives the reorientation of moments from in-plane (ab-plane) to out-of-plane (c-axis) direction that results in the distinct magnetic structures for two end compounds NdTe 2 (x = 0) and NdSbTe (x = 1). Furthermore, the moment orientation in NdSb x Te 2-x+δ is also found to be strongly tunable upon application of weak magnetic field, leading to rich magnetic phases depending on the composition stoichiometry, temperature, and magnetic field. Such strong tuning of magnetism in this material establishes it as a promising platform for investigating tunable topological states and correlated topological physics.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗
DOE OSTI2020

Materials Data on Sb2Te3 by Materials Project

Sb2Te3 is MAX Phase-derived structured and crystallizes in the trigonal R-3m space group. The structure is two-dimensional and consists of three Sb2Te3 sheets oriented in the (0, 0, 1) direction. Sb3+ is bonded to six Te2- atoms to form a mixture of edge and corner-sharing SbTe6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are three shorter (3.03 Å) and three longer (3.19 Å) Sb–Te bond lengths. There are two inequivalent Te2- sites. In the first Te2- site, Te2- is bonded to six equivalent Sb3+ atoms to form edge-sharing TeSb6 octahedra. In the second Te2- site, Te2- is bonded in a 3-coordinate geometry to three equivalent Sb3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sb8Te3 by Materials Project

Sb8Te3 is Calaverite-like structured and crystallizes in the trigonal R-3m space group. The structure is two-dimensional and consists of twelve stibium metallicum molecules and three Sb4Te3 sheets oriented in the (0, 0, 1) direction. In each Sb4Te3 sheet, there are two inequivalent Sb+0.75+ sites. In the first Sb+0.75+ site, Sb+0.75+ is bonded to six Te2- atoms to form a mixture of edge and corner-sharing SbTe6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are three shorter (3.04 Å) and three longer (3.20 Å) Sb–Te bond lengths. In the second Sb+0.75+ site, Sb+0.75+ is bonded in a 3-coordinate geometry to three equivalent Te2- atoms. All Sb–Te bond lengths are 3.57 Å. There are two inequivalent Te2- sites. In the first Te2- site, Te2- is bonded to six Sb+0.75+ atoms to form a mixture of distorted edge and corner-sharing TeSb6 octahedra. The corner-sharing octahedral tilt angles are 4°. In the second Te2- site, Te2- is bonded to six equivalent Sb+0.75+ atoms to form a mixture of edge and corner-sharing TeSb6 octahedra. The corner-sharing octahedral tilt angles are 4°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sb2Te by Materials Project

Sb2Te is Calaverite-like structured and crystallizes in the trigonal P-3m1 space group. The structure is two-dimensional and consists of two antimony molecules and one Sb4Te3 sheet oriented in the (0, 0, 1) direction. In the Sb4Te3 sheet, there are two inequivalent Sb1+ sites. In the first Sb1+ site, Sb1+ is bonded in a 3-coordinate geometry to three equivalent Te2- atoms. All Sb–Te bond lengths are 3.57 Å. In the second Sb1+ site, Sb1+ is bonded to six Te2- atoms to form a mixture of corner and edge-sharing SbTe6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are three shorter (3.04 Å) and three longer (3.20 Å) Sb–Te bond lengths. There are two inequivalent Te2- sites. In the first Te2- site, Te2- is bonded to six equivalent Sb1+ atoms to form a mixture of corner and edge-sharing TeSb6 octahedra. The corner-sharing octahedral tilt angles are 4°. In the second Te2- site, Te2- is bonded to six Sb1+ atoms to form a mixture of distorted corner and edge-sharing TeSb6 octahedra. The corner-sharing octahedral tilt angles are 4°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SbTe by Materials Project

SbTe crystallizes in the trigonal P-3m1 space group. The structure is two-dimensional and consists of one Sb sheet oriented in the (0, 0, 1) direction and two Sb2Te3 sheets oriented in the (0, 0, 1) direction. In the Sb sheet, Sb is bonded in a 3-coordinate geometry to three equivalent Sb atoms. All Sb–Sb bond lengths are 2.95 Å. In each Sb2Te3 sheet, there are two inequivalent Sb sites. In the first Sb site, Sb is bonded to six Te atoms to form a mixture of edge and corner-sharing SbTe6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are three shorter (3.03 Å) and three longer (3.20 Å) Sb–Te bond lengths. In the second Sb site, Sb is bonded to six Te atoms to form a mixture of edge and corner-sharing SbTe6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are three shorter (3.04 Å) and three longer (3.19 Å) Sb–Te bond lengths. There are three inequivalent Te sites. In the first Te site, Te is bonded in a distorted T-shaped geometry to three equivalent Sb atoms. In the second Te site, Te is bonded to six Sb atoms to form edge-sharing TeSb6 octahedra. In the third Te site, Te is bonded in a 3-coordinate geometry to three equivalent Sb atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sb2Te3 by Materials Project

Sb2Te3 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Sb3+ is bonded in a linear geometry to two Te2- atoms. There are one shorter (2.90 Å) and one longer (3.17 Å) Sb–Te bond lengths. There are two inequivalent Te2- sites. In the first Te2- site, Te2- is bonded to two equivalent Sb3+ and six equivalent Te2- atoms to form a mixture of edge and corner-sharing TeSb2Te6 hexagonal bipyramids. All Te–Te bond lengths are 3.39 Å. In the second Te2- site, Te2- is bonded to one Sb3+ and seven equivalent Te2- atoms to form distorted TeSbTe7 hexagonal bipyramids that share corners with seven TeSb2Te6 hexagonal bipyramids and edges with eighteen equivalent TeSbTe7 hexagonal bipyramids. There are six shorter (3.39 Å) and one longer (3.48 Å) Te–Te bond lengths.

36 MATERIALS SCIENCE↗