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beta-Bi2Pd compound has been proposed as another example of a multi-gapsuperconductor [Y. Imai et al., J. Phys. Soc. Jap. 81, 113708 (2012)]. Here, wereport on measurements of several important physical quantities capable to showa presence of multiple energy gaps on our superconducting single crystals ofbeta-Bi2Pd with the critical temperature Tc close to 5 K. The calorimetricstudy via a sensitive ac technique shows a sharp anomaly at the superconductingtransition, however only a single energy gap is detected. Also othercharacteristics inferred from calorimetric measurements as the field dependenceof the Sommerfeld coefficient and the temperature and angular dependence of theupper critical magnetic field point unequivocally to standard single s-wave gapsuperconductivity. The Hall-probe magnetometry provides the same result fromthe analysis of the temperature dependence of the lower critical field. Asingle-gapped BCS density of states is detected by the scanning tunnelingspectroscopy measurements. Then, the bulk as well as the surface sensitiveprobes evidence a standard conventional superconductivity in this system wherethe topologically protected surface states have been recently detected by ARPES[M. Sakano et al., Nature Comm. 6, 8595 (2015)] .

Single gap superconductivity in beta-Bi2Pd