Matthias Hepting

Scientist | group leader neutron spectroscopy @mpifkf | previously: @Stanford, @SLAClab, @UBC

[Matthias Hepting @MatthiasHepting]

The claim of superconductivity above 300 K in #LK99 has captured the public‘s attention, but turned out as scientifically unfounded. Yet, the discovery of 80 K superconductivity in #La3Ni2O7 evaded public notice. Writing in @NatureNV I elucidate the significance of this finding

[Daniele Preziosi @DanielePreziosi]

My short stay in #HongKong has been full of #nickelates (mainly La327), but also of nice food, people and art. Among the others, happy to have listened at Prof. Zhang’s talk, yes the one of the Zhang-Rice #Singlet #bonding #antibonding in a two-orbitals model for nickelates

[European Synchrotron @esrfsynchrotron]

🔦#SpotlightonScience

Scientists have uncovered a previously unknown crystal structure in a layered nickelate material known for high-temperature superconductivity, using high-pressure X-ray diffraction at ESRF beamline ID27.

Read more 👉https://t.co/qSZ9Jz7GJu

@lightsources

[Max Planck Institute for Solid State Research @mpifkf]

In a collaborative effort, we have discovered a new crystal structure in La₃Ni₂O₇, a material known to exhibit high-temperature superconductivity under high pressure. Read more at: https://t.co/yP6JVJ8LrB

[Physical Review Letters @PhysRevLett]

Volume 133, Issue 14
https://t.co/mk2nZe3K8I
Cover: Atomic-resolution scanning transmission electron microscope images of a La₃Ni₂O₇ single crystal
https://t.co/xB6XQ3tg45

[Physical Review B @PhysRevB]

PRB Editors' Suggestion: Investigation of #SpinExcitations and #ChargeOrder in bulk #crystals of the infinite-layer #nickelate #LaNiO2

S. Hayashida et al.,
Phys. Rev. B 109, 235106

➡️ https://t.co/t8d3CxSmmq
#OpenAccess #EdSugg @APSPhysics @MatthiasHepting @YESuyolcu @mpifkf

[Matthias Hepting @MatthiasHepting]

👉🏼 Open access SharedIt link to my @NatureNV article https://t.co/Gj7JCwllvn

👉🏼 Link to the @Nature article reporting high-temperature superconductivity in La3Ni2O7 https://t.co/FxVz568QMf

👉🏼 Link to our preprint refuting superconductivity in LK99 https://t.co/fJ9dcum7Qa

[Matthias Hepting @MatthiasHepting]

The claim of superconductivity above 300 K in #LK99 has captured the public‘s attention, but turned out as scientifically unfounded. Yet, the discovery of 80 K superconductivity in #La3Ni2O7 evaded public notice. Writing in @NatureNV I elucidate the significance of this finding

[Nature News & Views @NatureNV]

What happens to this nickel-based compound when it’s subjected to a pressure equivalent to the force that 120 elephants would exert on the area of a postage stamp? https://t.co/pWMWlgRras

[Max Planck Institute for Solid State Research @mpifkf]

🚨 Deadline approaching! 🚨 We're accepting applications for PhD students! This competitive doctoral program provides students with an excellent platform for a career in solid state chemistry, condensed matter physics, and materials science. https://t.co/XBr5yPKyW9

[Dan Elton @moreisdifferent]

😍Very impressive work! This is the final nail in the coffin for #LK99 - no point wasting any more time trying to replicate the Korean paper at this point!

"Pure crystals of LK-99, synthesized by a team at the Max Planck Institute for Solid State Research in Stuttgart, Germany"

"Unlike previous synthesis attempts that relied on crucibles, the researchers used a technique called floating zone crystal growth that allowed them to avoid introducing sulfur into the reaction.

The result was a transparent purple crystal. Separated from impurities, LK-99 is not a superconductor, but an insulator with a resistance in the millions of ohms — too high to run a standard conductivity test."
https://t.co/lB0jnavFA2

[Max Planck Institute for Solid State Research @mpifkf]

We've been working on advancing single-crystal synthesis of perovskite rare-earth nickelates, a quantum material known for its exceptional electronic and magnetic properties! Learn more about our work at: https://t.co/juhEzKEU0K

[MadsCWeber @MadsCWeber]

We're reopening our search for a dedicated PhD candidate. If you're passionate about exploring material properties with light, we'd love to hear from you. Details: https://t.co/aiPLA3POb0. Please retweet!
#multiferroics #ferroelectrics #RamanSpectroscopy #PhDposition

[Matthias Hepting @MatthiasHepting]

We investigate the doping dependence of low-energy plasmon excitations in the cuprate superconductor La2-xSrxCuO4 using #RIXS 👉🏼 https://t.co/kw8lqILjQn

@PhysRevB @YESuyolcu @mpifkf
@HZB_BESSY @advancedphoton

[Max Planck Institute for Solid State Research @mpifkf]

Read our recent paper on topotactically induced oxygen vacancy order in nickelate single crystals. @Yu_Mi_Wu @YESuyolcu @MatthiasHepting https://t.co/fmz4PsYYEB

[Y. Eren Suyolcu @YESuyolcu]

Happy to share our recent publication @PhysRevMater!
Congratulations, @Yu_Mi_Wu, for the great work @mpifkf!
Our observations underpin a pyramidal-type brownmillerite-like structure in the nickelates through a topotactic reduction. @MatthiasHepting
https://t.co/QANYIa2G7Z

[MadsCWeber @MadsCWeber]

We have an open PhD position at the IMMM, Le Mans University about “Raman and non-linear laser spectroscopy on multiferroic materials”. If you are curious to discover ferroic properties with light, you should apply OR spread the word. 🔬🧲

[Matthias Hepting @MatthiasHepting]

New paper in @PhysRevMater. We report the first synthesis of millimeter-sized crystals of nickelates with the infinite-layer structure 👉🏼 https://t.co/hvNQSF2AuY

@mpifkf @esrfsynchrotron

[Matthias Hepting @MatthiasHepting]

@pkayamse @hochschuleaalen Congratulations, Pinar!!! 🥳😃👏🏼

[Berthold Jaeck @BertholdJaeck]

My group is looking for two PhD students starting 9/2023 to implement quantum sensing microscopies at milli-Kelvin temperatures and perform electrical transport measurements on our topological thin film materials. Please RT and help spread the word! Link: https://t.co/N2uxBmr6kM