Abstract
A doped quantum spin-liquid candidate transitions from one regime of superconductor electron pairing to another as pressure increases, thus widening the potential hosts of unconventional superconductivity.
Highlights
Strong interactions between itinerant electrons in solids cause peculiar correlations or organizations among the electrons beyond the Fermi-liquid (FL) framework [1]
The present study experimentally explores the nature of the pairing condensate in a doped spin liquid candidate material and under varying pressure, which changes the electron-electron Coulombic interactions across the Mott critical value in the system
Superconductivity is of the Bose-Einstein condensation (BEC) type, as the size of Cooper pairs is as small as their mean distance, or equivalently, the interaction energy is comparable to the Fermi energy
Summary
Strong interactions between itinerant electrons in solids cause peculiar correlations or organizations among the electrons beyond the Fermi-liquid (FL) framework [1]. According to the transport study [37,40], the metallic state at low pressures is a non-Fermi liquid (NFL), and the doped holes, not particles of the entire band, carry mobile charges. Superconductivity in such a doped QSL candidate [24,37], possibly appearing in place of the low-temperature instability of the QSL [41], is of profound interest [15,16,17,18,19,20,21,22,23].
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