04907nas a2200229 4500008004100000245007800041210007000119260000800189490000600197520417400203100001804377700001904395700002204414700001704436700001704453700001704470700001604487700002104503700002204524700002104546856011004567 2024 eng d00aUnconventional hole doping of S = ½ kagome antiferromagnet CoCu3(OH)6Cl20 aUnconventional hole doping of S ½ kagome antiferromagnet CoCu3OH cSEP0 v33 a

Geometrically perfect S = ½ kagome lattices with frustrated magnetism are typically electrical insulators. Electron or hole doping is predicted to induce an exotic conducting state including superconductivity. Herein, an unconventional strategy of doping an S = ½ kagome lattice CoCu3(OH)6Cl2 is adopted – a structural analogue of a well-known quantum spin liquid (QSL) candidate herbertsmithite (ZnCu3(OH)6Cl2) – by integrating it with reduced graphene oxide (rGO) via in situ redox chemistry. Such an integration drastically enhances the electrical conductivity, resulting in the transformation of an insulator to a semiconductor, corroborating the respective density of states obtained from the density functional theory calculations. Estimation of the magnetic moments, data on the Hall-effect measurements, Bader charge analysis, and photoemission signals, altogether provide a bold signature of remote hole doping in CoCu3(OH)6Cl2 by rGO. The remote doping provides an alternative to the site doping approach to impart exotic electronic properties in spin liquid candidates, specifically, the generation of topological states like Dirac metal is envisioned.

1 aMandal, Rimpa1 aNinawe, Pranay1 aAnanthram, K., S.1 aMhase, Akash1 aGupta, Kriti1 aSaha, Sauvik1 aUgale, Ajay1 aSingh, Kirandeep1 aTarafder, Kartick1 aBallav, Nirmalya uhttps://library.ncl.res.in/content/unconventional-hole-doping-s-%C2%BD-kagome-antiferromagnet-cocu3oh6cl200799nas a2200241 4500008004100000022001400041245008900055210006900144260000900213300001600222490000700238100001700245700002100262700002500283700001600308700001900324700001900343700001700362700001700379700002100396700001900417856012100436 2024 eng d a1477-922600aUnprecedented C-F bond cleavage in perfluoronaphthalene during cobaltocene reduction0 aUnprecedented CF bond cleavage in perfluoronaphthalene during co cNOV  a17789-177930 v531 aKundu, Gargi1 aPramanik, Debjit1 aDash, Soumya, Ranjan1 aKumar, Ravi1 aSangole, Mayur1 aTothadi, Srinu1 aGhosh, Aryya1 aVanka, Kumar1 aSingh, Kirandeep1 aSen, Sakya, S. uhttps://library.ncl.res.in/content/unprecedented-c-f-bond-cleavage-perfluoronaphthalene-during-cobaltocene-reduction01467nas a2200205 4500008004100000022001400041245005900055210005800114260000800172300001100180490000800191520084600199100001901045700001901064700002301083700002101106700002101127700002201148856009101170 2024 eng d a2469-995000aUnveiling different structural orderings in Fe5-xGeTe20 aUnveiling different structural orderings in Fe5xGeTe2 cAUG a0751190 v1103 a

We investigate the metallic van der Waals itinerant ferromagnet Fe5-xGeTe2 5 - x GeTe 2 with atomic scale, spatially resolved low-temperature scanning tunneling microscopy (STM), and spectroscopy (STS). STM images unveil / / a new structural order 2a a x 1a a along with the known order 3a a x 3a a manifesting as nonuniform domains. STS shows spatial and energy resolved local density of states that reveal the crucial influence of Fe(1) site occupancy on the system's electronic interactions. Our magnetization measurements show magnetic anomalies at lower temperatures and identify a Curie temperature (Tc) c ) surpassing room temperature. Collectively, our results elucidate the intricate nature of Fe5-xGeTe2 5 - x GeTe 2 and underscore its potential for tunability of spintronics and high-temperature magnetic applications.

1 aWalve, Vaibhav1 aParakh, Piyush1 aRajput, Umashankar1 aMhase, Akash, S.1 aSingh, Kirandeep1 aDeshpande, Aparna uhttps://library.ncl.res.in/content/unveiling-different-structural-orderings-fe5-xgete2