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Title: Magnet Lab Highlight: Upper critical field reaches 90 tesla near the Mott transition in fulleride superconductors

Abstract

The alkali-doped fullerides provide the first example of a transition from a three-dimensional Mott insulator to a superconductor, enabling the effects of both dimensionality and electron correlation on superconductivity to be explored. Chemically the alkali species tunes the superconductivity in the vicinity of the the Mott transition via sample volume. Measuring the relationship between the superconducting transition temperature and upper critical field reveals a crossover from weak- to strong-coupling associated with the dynamical Jahn–Teller effect as the Mott transition is approached. The use of pulsed magnets is required because the upper critical field is enhanced in the vicinity of the Mott insulating phase, reaching 90 T for RbxCs3-xC60 — the highest among cubic crystals. This required close collaboration between Prof Kasahara’s group and the Mag Lab to design rf-measurements compatible with sample encapsulation in an inert atmosphere. The concomitant increase of pairing strength with lattice volume near the Mott transition suggest that the cooperative interplay between molecular electronic structure and strong electron correlations plays a key role in realizing robust superconductivity (with high-T C and high-H C2).

Authors:
 [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1361489
Report Number(s):
LA-UR-17-24526
DOE Contract Number:
AC52-06NA25396
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; High Magnetic Field Science; Superconductor

Citation Formats

Mcdonald, Ross David. Magnet Lab Highlight: Upper critical field reaches 90 tesla near the Mott transition in fulleride superconductors. United States: N. p., 2017. Web. doi:10.2172/1361489.
Mcdonald, Ross David. Magnet Lab Highlight: Upper critical field reaches 90 tesla near the Mott transition in fulleride superconductors. United States. doi:10.2172/1361489.
Mcdonald, Ross David. 2017. "Magnet Lab Highlight: Upper critical field reaches 90 tesla near the Mott transition in fulleride superconductors". United States. doi:10.2172/1361489. https://www.osti.gov/servlets/purl/1361489.
@article{osti_1361489,
title = {Magnet Lab Highlight: Upper critical field reaches 90 tesla near the Mott transition in fulleride superconductors},
author = {Mcdonald, Ross David},
abstractNote = {The alkali-doped fullerides provide the first example of a transition from a three-dimensional Mott insulator to a superconductor, enabling the effects of both dimensionality and electron correlation on superconductivity to be explored. Chemically the alkali species tunes the superconductivity in the vicinity of the the Mott transition via sample volume. Measuring the relationship between the superconducting transition temperature and upper critical field reveals a crossover from weak- to strong-coupling associated with the dynamical Jahn–Teller effect as the Mott transition is approached. The use of pulsed magnets is required because the upper critical field is enhanced in the vicinity of the Mott insulating phase, reaching 90 T for RbxCs3-xC60 — the highest among cubic crystals. This required close collaboration between Prof Kasahara’s group and the Mag Lab to design rf-measurements compatible with sample encapsulation in an inert atmosphere. The concomitant increase of pairing strength with lattice volume near the Mott transition 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).},
doi = {10.2172/1361489},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month = 6
}

Technical Report:

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