Apparent Ferromagnetism in Exfoliated Ultrathin Pyrite Sheets

Autor(es):Mostrar menos -

Puthirath, Anand B. ^[1] ; Balan, Aravind Puthirath ^{[2, 3]} ; Oliveira, Eliezer F. ^{[1, 4, 5]} ; Sreepal, Vishnu ^{[2, 3]} ; Robles Hernandez, Francisco C. ^{[1, 6]} ; Gao, Guanhui ^[1] ; Chakingal, Nithya ^[1] ; Sassi, Lucas M. ^[1] ; Thibeorchews, Prasankumar ^[1] ; Costin, Gelu ^[7] ; Vajtai, Robert ^[1] ; Galvao, Douglas S. ^{[1, 4, 5]} ; Nair, Rahul R. ^{[2, 3]} ; Ajayan, Pulickel M. ^[1]

Afiliação do(s) autor(es)

^[1] Rice Univ, Dept Mat Sci & NanoEngn, Houston, TX 77005 - USA

^[2] Univ Manchester, Dept Chem Engn & Analyt Sci CEAS, Manchester M13 9PL, Lancs - England

^[3] Univ Manchester, Natl Graphene Inst NGI, Manchester M13 9PL, Lancs - England

^[4] Univ Estadual Campinas, UNICAMP, Grp Organ Solids & New Mat, Gleb Wataghin Inst Phys, BR-13083970 Campinas, SP - Brazil

^[5] Univ Estadual Campinas, UNICAMP, Ctr Computat Engn & Sci CCES, BR-13083970 Campinas, SP - Brazil

^[6] Univ Houston, Mech Engn Technol Program, Dept Engn Technol, Coll Technol, Houston, TX 77204 - USA

^[7] Rice Univ, Dept Earth Environm & Planetary Sci, Houston, TX 77005 - USA

• Tipo de documento: Artigo Científico
• Fonte: Journal of Physical Chemistry C; v. 125, n. 34, p. 18927-18935, SEP 2 2021.
• Citações Web of Science: 0

Resumo

There has been no experimental evidence for ferromagnetic ordering in isotropic atomically thin two-dimensional crystals, until a bilayer Cr2Ge2Te6 and a three-atom thick monolayer CrI3 is shown to retain ferromagnetic ordering at finite temperatures. Here, we demonstrate successful isolation of a nonvan der Waals-type ultrathin nanosheet of FeS2 derived from naturally occurring pyrite mineral (FeS2) by means of liquid-phase exfoliation. Structural characterizations imply that (111)-oriented sheets are predominant and are supported theoretically by means of density functional theory surface energy calculations. Spin-polarized density theory calculations further predicted that (111)-oriented three-atom thick pyrite sheets have a stable ferromagnetic ground state different from their diamagnetic bulk counterparts. This theoretical finding is evaluated by experimentally employing low-temperature superconducting quantum interference device measurements, and an anomalous ferromagnetic kind of behavior is observed. (AU)

• Processo FAPESP: 16/18499-0 - Investigação de propriedades estruturais, mecânicas e funcionais de nanoestruturas de carbono
• Beneficiário: Eliezer Fernando de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/08293-7 - CECC - Centro de Engenharia e Ciências Computacionais
• Beneficiário: Munir Salomao Skaf
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 19/07157-9 - Projetando novas estruturas 3d a partir de modelos de zeólitas para aplicações em impressão 3d
• Beneficiário: Eliezer Fernando de Oliveira
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado