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Type-I superconductivity in KBi2 single crystals

We report the detailed transport, magnetic, thermodynamic properties and theoretical calculation of KBi2 single crystals in superconducting and normal states. KBi2 shows metallic behavior at normal state and enters superconducting state below Tc = 3.573 K. Moreover, KBi2 exhibits low critical fields in all of measurements, field-induced crossover from second to first-order phase transition in specific heat measurement, typical magnetization isotherms of type-I superconductors, and small Ginzburg-Landau parameter kappaGL = 0.611. These results clearly indicate that KB2 is a type-I superconductor with thermodynamic critical field Hc = 234.3(3) Oe.

preprint2015arXivOpen access
Shanshan SunKai LiuHechang Lei
cond-mat.supr-concond-mat.mtrl-sci
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Shanshan SunKai LiuHechang Lei

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