Controlled access to the border of the Mott insulating state by variation of control parameters offers exotic electronic states such as anomalous and possibly high-transition-temperature (Tc) superconductivity. The alkali-doped fullerides show a transition from a Mott insulator to a superconductor for the first time in three-dimensional materials, but the impact of dimensionality and electron correlation on superconducting properties has remained unclear. Here we show that, near the Mott insulating phase, the upper critical field Hc2 of the fulleride superconductors reaches values as high as ∼90 T—the highest among cubic crystals. This is accompanied by a crossover from weak- to strong-coupling superconductivity and appears upon entering the metallic state with the dynamical Jahn–Teller effect as the Mott transition is approached. These results suggest that the cooperative interplay between molecular electronic structure and strong electron correlations plays a key role in realizing robust superconductivity with high-Tc and high-Hc2. Alkali-doped fullerides are superconductors but the impact of dimensionality and electron correlation remains unclear. Here, Kasaharaet al. report an upper critical field about 90 T, suggesting cooperative interplay between molecular electronic structure and strong electron correlations.

/pdf/upper-critical-field-reaches-90-tesla-near-the-mott-4jg0c0lv3q.pdf

Upper critical field reaches 90 tesla near the Mott transition in fulleride superconductors

The upper critical field ${H}_{c2}$ of the layered organic superconductor $\ensuremath{\kappa}\ensuremath{-}(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF}{)}_{2}\mathrm{Cu}[\mathrm{N}(\mathrm{CN}{)}_{2}]\mathrm{Br}$ has been studied with emphasis on the field direction parallel to the conducting plane. Application of hydrostatic pressure changes the shape of the ${H}_{c2}(T)$ diagram, removing a notable curvature observed at ambient pressure in the high-temperature region and giving almost linear dependence. The change is ascribed to the dominance of the orbital pair-breaking effect under pressure as opposed to the Pauli paramagnetic limiting of ${H}_{c2}$ at ambient pressure. An abrupt change by pressure of the slope of the ${H}_{c2}(T)$ curve in a temperature range near ${T}_{c}$ is ascribed to the phase change in the material due to the ordering of the ethylene fragments of the BEDT-TTF molecules.

/pdf/magnetic-field-and-temperature-phase-diagram-of-the-2e8c58zyuk.pdf

Magnetic field and temperature phase diagram of the pressurized organic superconductor κ-(BEDT-TTF) 2 Cu[N(CN) 2 ]Br in the field parallel to the conducting plane

We report magnetoresistance measurements of layered superconductor $\mathrm{Zr}\mathrm{N}{\mathrm{Cl}}_{07}$ at high magnetic fields $(H)$ as high as $27\phantom{\rule{03em}{0ex}}\mathrm{T}$ and temperatures $(T)$ as low as $05\phantom{\rule{03em}{0ex}}\mathrm{K}$ The $T$ dependence of the upper critical field ${H}_{c2}(T)$ for $H\ensuremath{\Vert}c$ and $H\ensuremath{\perp}c$ was obtained ${H}_{c2}(T)$ starts to increase with a gentle slope near ${T}_{c}(0)$ followed by a steep slope with decreasing $T$, implying the dimensional crossover of the interplane coherence length from three dimensional to two dimensional (2D) The ${H}_{c2}(T)$ is found to be anisotropic for the field direction, where the slope of ${H}_{c2}^{\ensuremath{'}}=(d{H}_{c2}∕dT)$ near $H\ensuremath{\approx}1\phantom{\rule{03em}{0ex}}\mathrm{T}$ can be estimated as ${H}_{c2}^{\ensuremath{'}\ensuremath{\perp}}\ensuremath{\approx}\ensuremath{-}221\phantom{\rule{03em}{0ex}}\mathrm{kOe}∕\mathrm{K}$ and ${H}_{c2}^{\ensuremath{'}\ensuremath{\Vert}}\ensuremath{\approx}\ensuremath{-}49\phantom{\rule{03em}{0ex}}\mathrm{kOe}∕\mathrm{K}$ for $H\ensuremath{\Vert}c$ and $H\ensuremath{\perp}c$, respectively The obtained anisotropy parameter $\ensuremath{\gamma}\ensuremath{\approx}45$ gives evidence for the 2D characteristic of the superconducting state in $\mathrm{Zr}\mathrm{N}{\mathrm{Cl}}_{07}$

/pdf/upper-critical-field-in-the-electron-doped-layered-a52jg9aj8g.pdf

Upper critical field in the electron-doped layered superconductor ZrNCl-0.7 : Magnetoresistance studies

The upper critical field H c2 of the layered superconductor κ-(BEDT-TTF) 2 Cu[N(CN) 2 ]Cl under the pressure of 1–2 kbar has been studied under the magnetic field applied parallel to the superconducting plane. The H c2 changes with temperature almost linearly and exceeds the BCS Pauli paramagnetic limit near 0 K. By taking into account the sharp local minimum of the resistance in the parallel orientation of the magnetic field to the layer, the H c2 is discussed in relation to the inhomogeneous order-parameter state. The coherence lengths are determined as 20±3 and 0.8±0.2 nm parallel and perpendicular to the layer from the temperature dependence of H c2 near T c , while the corresponding lengths are 13±1 and 1.3±0.1 nm from H c2 at 0 K, respectively, for the crystal under the pressure of 1.9 kbar. The origin of the difference is discussed.

Upper Critical Field of κ-(BEDT-TTF)2Cu[N(CN)2]Cl under Magnetic Fields Parallel to the Superconducting Plane

Upper critical field of κ-(BEDT-TTF)2X (X=Cu[N(CN)2]Br, Cu(NCS)2) in magnetic fields parallel to the layer ☆

The upper critical field Hc2 of κ-(ET)2Cu[N(CN)2]Br under magnetic fields parallel to the superconducting layer has been determined based on the temperature dependence of the out-of-plane resistance The Hc2 exceeds the Pauli paramagnetic limit value based upon a weak coupling BCS model and tends to increase further toward lower temperatures

Upper critical field of κ-(ET)2Cu[N(CN)2]Br under parallel magnetic fields

Upper critical fields of pressurized organic superconductors κ-(BEDT-TTF)2X in the magnetic fields parallel to the layer

Handle everyday research tasks with reliable, citation-backed results

Your personal Research Agent to handle research tasks with citation-backed results

Popular Tasks used by Researchers

How can I help with your research?

Meet SciSpace

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

S. Kamiya

Author Tools

Chat about Author

Papers

Magnetic field and temperature phase diagram of the pressurized organic superconductor κ-(BEDT-TTF) 2 Cu[N(CN) 2 ]Br in the field parallel to the conducting plane

Upper critical field of κ-(ET)2Cu[N(CN)2]Br under parallel magnetic fields

Upper critical fields of pressurized organic superconductors κ-(BEDT-TTF)2X in the magnetic fields parallel to the layer