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‘Magnetic graphene’ switches between insulator and conductor

52 pointsby mangoleafover 6 years ago

3 comments

apoover 6 years ago
Although the term &quot;magnetic graphene&quot; is sometimes used to refer to FePS3, this compound isn&#x27;t graphene - it&#x27;s devoid of carbons.<p>Rather, FePS3, like graphene, has a tendency to form thin sheets. But that&#x27;s where the similarities end.<p>The original paper&#x27;s abstract is more helpful than the article:<p><i>Two-dimensional materials have proven to be a prolific breeding ground of new and unstudied forms of magnetism and unusual metallic states, particularly when tuned between their insulating and metallic phases. Here we present work on a new metal-to-insulator transition system FePS3. This compound is a two-dimensional van der Waals antiferromagnetic Mott insulator. We report the discovery of an insulator-metal transition in FePS3, as evidenced by x-ray diffraction and electrical transport measurements, using high pressure as a tuning parameter. Two structural phase transitions are observed in the x-ray diffraction data as a function of pressure, and resistivity measurements show evidence of the onset of a metallic state at high pressures. We propose models for the two new structures that can successfully explain the x-ray diffraction patterns.</i><p><a href="https:&#x2F;&#x2F;journals.aps.org&#x2F;prl&#x2F;abstract&#x2F;10.1103&#x2F;PhysRevLett.121.266801" rel="nofollow">https:&#x2F;&#x2F;journals.aps.org&#x2F;prl&#x2F;abstract&#x2F;10.1103&#x2F;PhysRevLett.12...</a><p>And this general-audience article is IMO better than the one linked:<p><i>&quot;The discovery of graphene led me to wonder if I could introduce magnetism to 2-D materials similar to graphene,&quot; explains Park. &quot;Physicists have inherited the challenge of studying and explaining the physical properties of the two-dimensional world. In spite of its academic importance and applicability, this field is very much under-explored,&quot; he adds.</i><p><a href="https:&#x2F;&#x2F;phys.org&#x2F;news&#x2F;2018-10-flexy-flat-functional-magnets.html" rel="nofollow">https:&#x2F;&#x2F;phys.org&#x2F;news&#x2F;2018-10-flexy-flat-functional-magnets....</a>
julienfr112over 6 years ago
Graphene can do anything, but leave the lab.
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slyrusover 6 years ago
Is 10 gPa (is that the right capitalization for gigaPascal? Gigapascal? GigaPascal?) anyway? Is that something routinely used in the lab or in production of commercial materials like chips or other electronic equipment?
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