1
|
Park JG, Collins BA, Darago LE, Runčevski T, Ziebel ME, Aubrey ML, Jiang HZH, Velasquez E, Green MA, Goodpaster JD, Long JR. Magnetic ordering through itinerant ferromagnetism in a metal-organic framework. Nat Chem 2021; 13:594-598. [PMID: 33859391 DOI: 10.1038/s41557-021-00666-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 02/18/2021] [Indexed: 11/09/2022]
Abstract
Materials that combine magnetic order with other desirable physical attributes could find transformative applications in spintronics, quantum sensing, low-density magnets and gas separations. Among potential multifunctional magnetic materials, metal-organic frameworks, in particular, bear structures that offer intrinsic porosity, vast chemical and structural programmability, and the tunability of electronic properties. Nevertheless, magnetic order within metal-organic frameworks has generally been limited to low temperatures, owing largely to challenges in creating a strong magnetic exchange. Here we employ the phenomenon of itinerant ferromagnetism to realize magnetic ordering at TC = 225 K in a mixed-valence chromium(II/III) triazolate compound, which represents the highest ferromagnetic ordering temperature yet observed in a metal-organic framework. The itinerant ferromagnetism proceeds through a double-exchange mechanism, which results in a barrierless charge transport below the Curie temperature and a large negative magnetoresistance of 23% at 5 K. These observations suggest applications for double-exchange-based coordination solids in the emergent fields of magnetoelectrics and spintronics.
Collapse
Affiliation(s)
- Jesse G Park
- Department of Chemistry, University of California, Berkeley, CA, USA
| | - Brianna A Collins
- Department of Chemistry, University of Minnesota-Twin Cities, Minneapolis, MN, USA
| | - Lucy E Darago
- Department of Chemistry, University of California, Berkeley, CA, USA
| | - Tomče Runčevski
- Department of Chemistry, Southern Methodist University, TX, USA
| | - Michael E Ziebel
- Department of Chemistry, University of California, Berkeley, CA, USA
| | - Michael L Aubrey
- Department of Chemistry, University of California, Berkeley, CA, USA
| | - Henry Z H Jiang
- Department of Chemistry, University of California, Berkeley, CA, USA.,Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Ever Velasquez
- Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA, USA
| | - Mark A Green
- School of Physical Sciences, University of Kent, Canterbury, UK
| | - Jason D Goodpaster
- Department of Chemistry, University of Minnesota-Twin Cities, Minneapolis, MN, USA
| | - Jeffrey R Long
- Department of Chemistry, University of California, Berkeley, CA, USA. .,Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA. .,Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA, USA.
| |
Collapse
|