Apparent Ferromagnetism in Exfoliated Ultrathin Pyrite Sheets

被引：47

作者：

Puthirath, Anand B. ^{[3
]}

Balan, Aravind Puthirath ^{[1
,2
]}

Oliveira, Eliezer F. ^{[3
,4
,5
]}

Sreepal, Vishnu ^{[1
,2
]}

Robles Hernandez, Francisco C. ^{[3
,6
]}

Gao, Guanhui ^{[3
]}

Chakingal, Nithya ^{[3
]}

Sassi, Lucas M. ^{[3
]}

Thibeorchews, Prasankumar ^{[3
]}

Costin, Gelu ^{[7
]}

Vajtai, Robert ^{[3
]}

Galvao, Douglas S. ^{[3
,4
,5
]}

Nair, Rahul R. ^{[1
,2
]}

Ajayan, Pulickel M. ^{[3
]}

机构：

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

[2] Univ Manchester, Natl Graphene Inst NGI, Manchester M13 9PL, Lancs, England

[3] Rice Univ, Dept Mat Sci & NanoEngn, Houston, TX 77005 USA

[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

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2021年 / 125卷 / 34期

基金：

巴西圣保罗研究基金会; 欧洲研究理事会;

关键词：

FES2; CRYSTAL; SPECTRA; SULFUR; STATES; OXIDE;

D O I：

10.1021/acs.jpcc.1c04977

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：18927 / 18935

页数：9

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