While workplace learning includes formal and informal learning, the rela-

Purpose The purpose of this paper is to advance our understanding of how psychological capital (PsyCap) influences job performance. The authors do so through adopting a moderated mediation framework. Specifically, the authors investigate the mediation role of informal learning in the PsyCap–job performance relationship and the moderating role of person–environment fit, i.e. the extent to which individual and organizational characteristics are compatible, in influencing the mediation. Design/methodology/approach The final sample consisted of 221 employees and their supervisors in South Korea. Findings The authors found that PsyCap had an indirect effect on job performance through informal learning. Moreover, the indirect effect of PsyCap on job performance through informal learning became stronger with low levels of person–organization (PO) and person–job (PJ) fit. Research limitations/implications The authors cannot completely rule out the effects of common method bias due to the cross-sectional research design. Practical implications The results reinforce the need for managers to understand employees’ level of PsyCap and take actions to enhance it because PsyCap can affect the extent to which individuals engage in informal learning, which in turn influences their job performance. Originality/value This paper adds to our understanding of the mechanisms and boundary conditions responsible for the PsyCap–job performance relationship. The authors found that informal learning operates as a mediator and both PO and PJ fit moderate the PsyCap–job performance relationship.

PurposeThis study aims to investigate the relationship between shared leadership and team performance at the team level. Drawing on conservation of resources (COR) theory, the authors examine whether shared leadership is associated with team performance through team positive psychological capital (PsyCap). This study further examines whether task-oriented and relationship-oriented shared leadership affect team performance differently.Design/methodology/approachMulti-source survey data were obtained from 92 team leaders and 319 employees. An aggregation approach was used to analyze the data at the team level.FindingsA high level of shared leadership positively influences team performance through the mediation of team PsyCap. Moreover, relationship-oriented shared leadership is positively associated with team performance through team PsyCap, while task-oriented shared leadership is negatively associated with team performance without the mediating effect of team PsyCap.Practical implicationsBy focusing on the negative effects of task-oriented shared leadership and the positive effects of relationship-oriented shared leadership and team PsyCap on team performance, this study suggests new ways to manage team performance effectively and extends shared leadership literature.Originality/valueThis study applied COR theory to analyze the effect of shared leadership mediated by team PsyCap on team performance. It contributes to shared leadership literature by shedding light on the negative effects of task-oriented shared leadership and on the positive aspects of relationship-oriented shared leadership.

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Using a combination of muon-spin relaxation (μSR), inelastic neutron scattering (INS), and nuclear magnetic resonance (NMR), we investigated the novel iron-based superconductor with a triclinic crystal structure (CaFe 1−x Pt x As) 10 Pt 3 As 8 (T c = 13 K), containing platinum-arsenide intermediary layers. The temperature dependence of the superfluid density obtained from the μSR relaxation-rate measurements indicates the presence of two superconducting gaps, 1 2 . According to our INS measurements, commensurate spin fluctuations are centered at the (π, 0) wave vector, like in most other iron arsenides. Their intensity remains unchanged across T c , indicating the absence of a spin resonance typical for many Fe-based superconductors. Instead, we observed a peak in the spin-excitation spectrum around ω 0 = 7 meV at the same wave vector, which persists above T c and is characterized by the ratio ω 0 /k B T c ≈ 6.2, which is significantly higher than typical values for the magnetic resonant modes in iron pnictides (∼ 4.3). The temperature dependence of magnetic intensity at 7 meV revealed an anomaly around T * = 45 K related to the disappearance of this new mode. A suppression of the spin-lattice relaxation rate, 1/T 1 T , observed by NMR immediately below T * without any notable subsequent anomaly at T c , indicates that T * could mark the onset of a pseudogap in (CaFe 1−x Pt x As) 10 Pt 3 As 8 , which is likely associated with the emergence of preformed Cooper pairs.