La6Pd2+xSb15 (x = 0.28): A rare-earth palladium intermetallic compound with extended pnictogen ribbons
La6Pd2+xSb15 (x = 0.28): A rare-earth palladium intermetallic compound with extended pnictogen ribbons
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DOI：
10.1016/j.jssc.2020.121578
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发表时间：
2020-07
影响因子：
3.3
通讯作者：
Mihai I. Sturza;M. L. Amigó;J. I. Facio;F. Caglieris;S. Aswartham;S. Seiro;C. Hess;J. Brink
中科院分区：
文献类型：
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作者：
Mihai I. Sturza;M. L. Amigó;J. I. Facio;F. Caglieris;S. Aswartham;S. Seiro;C. Hess;J. Brink
镧和钯金属在熔融锑熔剂中反应合成了一种新型金属间三元化合物La6Pd2.28Sb15。该化合物在斜方空间群中结晶，其中a= 4.3082(9) Å,b= 15.399(3) Å 和c= 19.689(4) Å。晶体结构包含沿轴延伸的 Sb 方块和带状三维框架，包括复杂的 Sb-Sb 键合。 La6Pd2.28Sb15 具有抗磁性，磁化率与温度 (T) 的关系微弱。降低温度时，电阻率 (ρ) 降低，表明金属行为，并且在低温下，ρ 与 T 成二次关系。有趣的是，霍尔电阻率和磁阻都呈现出对所施加磁场的非线性依赖性，表明其具有多带行为。这得到了密度泛函电子结构计算的支持，该计算显示了源自锑化物子结构的复杂费米表面，并且包含电子和空穴袋以及开放片。
A new intermetallic ternary compound La6Pd2.28Sb15was synthesized from the reaction of lanthanum and palladium metals in a molten antimony flux. The compound crystallizes in the orthorhombic space groupImmmwitha= 4.3082(9) Å,b= 15.399(3) Å andc= 19.689(4) Å. The crystal structure contains a three-dimensional framework of Sb squares and ribbons that extend along theaaxis, including complex Sb–Sb bonding. La6Pd2.28Sb15is diamagnetic, with a magnetic susceptibility weakly dependent on temperature (T). The resistivity (ρ) decreases when lowering the temperature, indicating metallic behavior, and at low temperatures ρ depends quadratically onT. Interestingly, both the Hall resistivity and magnetoresistance present a nonlinear dependence on the applied magnetic field, suggesting a multiband behavior. This is supported by density-functional electronic structure calculations which show a complex Fermi surface originated in the antimonide substructures and containing both electron and hole pockets as well as open sheets.