Reduced superfluid density in a doped spin liquid candidate

Autor:	Wakamatsu, K., Ueno, Y., Miyagawa, K., Taniguchi, H., Kanoda, K.
Rok vydání:	2022
Předmět:	Condensed Matter - Superconductivity Condensed Matter - Strongly Correlated Electrons
Druh dokumentu:	Working Paper
Popis:	A quantum spin liquid (QSL) would be an exotic stage for superconductivity. A promising candidate for a doped QSL is the organic triangular-lattice system, kappa-(BEDT-TTF)4Hg2:89Br8, which hosts a non-Fermi liquid and magnetism of a QSL nature and shows superconductivity upon cooling. Here, we report that its superfluid density is anomalously reduced, indicating the existence of substantial incoherent spectral weight and weak superconducting phase stiffness. Moreover, the ratio of the superconducting transition temperature to the nominal Fermi temperature is as large as 0.1, orders of magnitude beyond typical BCS values. These observations in a system free from competing orders that complicate the similar issue in underdoped cuprates give a clue to the enigmatic missing superfluid density in doped Mott insulators. Comment: 4 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2205.03682 Zobrazit plný text záznamu View this record from Arxiv