Nontrivial Recurrent Intergrowth Structure and Unusual Magnetic Behavior of Intermetallic Compound Fe32+δGe33As2
| Autor: | Roman A. Khalaniya, Andrei V. Shevelkov, Alexander A. Tsirlin, Andrei V. Mironov, Anton Jesche, Valeriy Yu. Verchenko |
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| Rok vydání: | 2016 |
| Předmět: |
Condensed matter physics
Chemistry Transition temperature Intermetallic 02 engineering and technology Electronic structure Atmospheric temperature range 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Magnetic susceptibility 0104 chemical sciences Inorganic Chemistry Paramagnetism Crystallography Electrical resistivity and conductivity Phase (matter) Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Inorganic Chemistry. 55:12953-12961 |
| ISSN: | 1520-510X 0020-1669 |
| DOI: | 10.1021/acs.inorgchem.6b02412 |
| Popis: | A new phase Fe32+δGe33As2 (δ ≤ 0.136) was obtained by two-step synthesis from the elements. Fe32+δGe33As2 crystallizes in its own structure type (space group P6/mmm, Z = 1, a = 11.919(3) A, c = 7.558(4) A) that can be described as a recurrent two-dimensional intergrowth of two intermetallic structure types, MgFe6Ge6 and Co2Al5. Their blocks are represented by infinite columns in the structure. No visible structural changes were observed in the temperature range from 10 to 300 K. At 125 K, Fe32+δGe33As2 undergoes an antiferromagnetic-like transition, while above 150 K it shows a typical Curie–Weiss paramagnetic behavior. Below the transition temperature, a peculiar field-dependent magnetic susceptibility, that shows a significant increase of the susceptibility upon increasing the magnetic field, and a change in transport properties have been observed. Above 140 K, Fe32+δGe33As2 reveals a metallic behavior, in agreement with electronic structure calculation, while below this point the resistivity nonmonoton... |
| Databáze: | OpenAIRE |
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