Superconductivity and Normal-State Properties of Kagome Metal RbV<sub>3</sub>Sb<sub>5</sub> Single Crystals
Qiangwei Yin, Zhijun Tu, Chunsheng Gong, Yang Fu, Shaohua Yan, Hechang Lei
Abstract
We report the discovery of superconductivity and detailed normal-state physical properties of RbV 3 Sb 5 single crystals with V kagome lattice. RbV 3 Sb 5 single crystals show a superconducting transition at T c ∼ 0.92 K. Meanwhile, resistivity, magnetization and heat capacity measurements indicate that it exhibits anomalies of properties at T * ∼ 102–103 K, possibly related to the formation of charge ordering state. When T is lower than T * , the Hall coefficient R H undergoes a drastic change and sign reversal from negative to positive, which can be partially explained by the enhanced mobility of hole-type carriers. In addition, the results of quantum oscillations show that there are some very small Fermi surfaces with low effective mass, consistent with the existence of multiple highly dispersive Dirac band near the Fermi energy level.