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Coupling spins of molecular magnets to two-dimensional (2D) materials provides a framework to manipulate the magneto-conductance of 2D materials. However, with most molecules, the spin coupling is usually weak and devices fabricated from these require operation at low temperatures, which prevents practical applications. Here, we demonstrate field-effect transistors based on the coupling of a magnetic molecule quinoidal dithienyl perylenequinodimethane (QDTP) to 2D materials. Uniquely, QDTP switches from a spin-singlet state at low temperature to a spin-triplet state above 370 K, and the spin transition can be electrically transduced by both graphene and molybdenum disulphide. Graphene-QDTP shows hole-doping and a large positive magnetoresistance ( ~ 50%), while molybdenum disulphide-QDTP demonstrates electron-doping and a switch to large negative magnetoresistance ( ~ 100%) above the magnetic transition. Our work shows the promise of spin detection at high temperature by coupling 2D materials and molecular magnets. Engineering a coupling between magnetic molecules and conducting materials at room temperature could help the development of spintronic devices. Loh et al . show that the spin state of QDTP molecules deposited on graphene and MoS 2 couples to their electronic structure, affecting magnetotransport.

PurposeThis paper studies the impact of different chief executive officer (CEO) succession strategies on consumer evaluation of family firms. CEO succession is critical for family firms as improper succession planning has been shown to be the primary reason for high mortality rates of such firms. Furthermore, the choice of CEO (internal vs external) by family firms can send different signals to stakeholders and thereby impact their appraisal of such firms.Design/methodology/approachIn this paper, the authors use an experiment-based approach to test how the type of CEO succession (internal vs external) influences the consumer's evaluation of family firms.FindingsThe authors find that appointing an internal CEO leads to higher perception of firm capability, trust towards the firm and more favorable consumer attitudes. All these factors, in turn, lead to higher purchase intentions. External CEOs in family firms do not seem to have any de facto advantage regarding perceptions of higher capability.Originality/valueThus, the authors contribute to the literature of family firms by showing how family firm's strategic decisions during succession can affect consumer behavior.

In view of tuning different transitions, Co and V are substituted in Mn-rich Ni-Mn-Ga alloy. Ni 41 Co 9 Mn 30 V 2 Ga 18 sample undergoes a coupled magnetostructural transition above room temperature with a low thermal and magnetic hysteresis and high sensitivity of martensite transition temperature (8 K/T) with the field. ∆ S M is found to be a maximum of −2.33 J/kg-K for 3 T field change with a large RCP of 158 J/kg. The presence of intermartensite transition along with the magnetostructural transition widens the range of working temperature.

Many physical properties behave differently in disorder systems from the order one. The effects of atomic disorder on the magnetic properties have been explored on Co2TiSi and Co2TiAl full Heusler alloys. Co2TiSi crystallizes in an ordered L21 crystal symmetry, and Co2TiAl mainly possesses a B2 structure. The B2 disorder affects not only the magnetic ordering but also the saturation magnetization, causing the deviation from the Slater-Pauling prediction for Co2TiAl. The critical exponents of the magnetic phase transition have been analyzed by employing different techniques like, the Arrott plot, Kouvel–Fisher plot, critical isotherm analysis, scaling magnetic behavior, and magnetocaloric analysis as well. The calculated critical exponents are close to the mean field theory which implies long-range ferromagnetic ordering in Co2TiSi. However, the exchange interaction in Co2TiAl deviates from the long-range mean field theory. This may be due to the magnetic contribution of the B2-disordered phase. In addition to the magnetic ordering, the magnetocaloric analysis provides the applicability of Co2TiSi alloy as a low-cost, hysteresis-free magnetic refrigerant with a large working temperature near room temperature.

This dissertation contains three essays on the theme of industry-level innovation and different aspects of innovation. The essays contribute to the literatures of institutional theory, categories, commercialization, evaluation, responsible innovation, and governance of innovation. Over the past few decades, the world has observed a wave of commercialization which has changed the way many actions are performed. One of the key features has been that of the state relinquishing its control over many activities that are now performed in the market. This wave of commercialization has given rise to some unique and innovative forms of organization within existing industries. Some of the outcomes of these innovative forms of organizations are the emergence of new categories, hybridization of existing categories, tensions between various stakeholders because of the hybridizations, emergence of new performance evaluation systems, and new questions being raised on ethical and moral grounds concerning the application of such innovations. In this dissertation I have attempted to address some of these aforementioned aspects of industry-level innovation.

Synchronization measures between Electro-encephalograph (EEG) signals from different regions of the brain are often employed to characterize the interaction of brain areas during mental and physical activity. The present work examines the variation of alertness of human subjects due to fatigue in a simulated driving task induced by loss of sleep using a Horizontal Visibility Graph (HVG)-based EEG synchronization measure. A brain network is formed at each stage of the experiment using synchronization values and network parameter values from various brain regions are compared to study the variation in connectivity between brain regions along successive stages of the experiment.

We apply periodic control to realize a quantum thermal transistor, which we term as the Floquet Quantum thermal Transistor. Periodic modulation allows us to control the heat flows and achieve large amplification factors even for fixed bath temperatures. Importantly, this transistor effect persists in the cut-off region, where traditional quantum thermal transistors operating in absence of periodic modulation, fail to act as viable heat modulation devices.

Two-dimensional (2D) van der Waals (vdW) materials with lower symmetry (triclinic, monoclinic or orthorhombic) exhibit intrinsic anisotropic in-plane structure desirable for future optoelectronic surface operating devices. Herein, we report one such material, 2D \\(p\\)-type semiconductor germanium sulfide (GeS), a group IV monochalcogenide with puckered orthorhombic morphology, in which in-plane optical and transport properties can be correlated with its electronic structure. We systematically investigate the electronic band structure of the bulk GeS with micro-focused angle-resolved photoemission spectroscopy (\\(\\mu\\)-ARPES) and correspond the charge transport properties using the field-effect transistor (FET) device architecture, and optical anisotropy \\(via\\) angle-resolved polarization dependent Raman spectroscopy (ARPRS) on a micron-sized rectangle-shaped exfoliated bulk flake. The experimental valence band dispersion along the two high symmetry directions indicate highly anisotropic in-plane behavior of the charge carrier that agrees well with the density functional theory (DFT) calculations. In addition, we demonstrate the variation of the in-plane hole mobility (ratio \\(\\sim\\) 3.4) from the electrical conductivity with gate-sweep in a GeS-on-SiO\\(_2\\) FET. Moreover, we use the angle-resolved fluctuation of the Raman intensity of the characteristic phonon modes to precisely determine the armchair and zigzag edges of the particular flake. The unique structural motif of GeS with correlated electronic and optical properties are of great interest both for the physical understanding of the all-optical switch and their applications in memory devices.

We investigate thickness-dependent transformation from a paramagnetic to ferromagnetic phase in Cr\\(_{2}\\)Ge\\(_{2}\\)Te\\(_{6}\\) (CGT) in bulk and few-layer flake forms. 2D Ising-like critical transition in bulk CGT occurs at \\(T_{c}\\) = 67 K with out-of-plane magnetic anisotropy. Few-layer CGT on hBN/SiO\\(_{2}\\)/Si substrate displays the same \\(T_{c}\\) but also exhibits a new critical transition at \\(T^{\\prime}_c\\) = 14.2 K. Here, critical scaling analysis reveals the critical exponents differ significantly from those in bulk and do not align with the known universality classes. Our Density Functional Theory (DFT) and classical calculations indicate competition between magnetocrystalline and dipolar anisotropy emerges with reduced dimensions. The observed behavior is due to minor structural distortions in low dimensional CGT, which modify the balance between spin-orbit coupling, exchange interactions and dipolar anisotropy. This triggers a critical crossover at \\(T^{\\prime}_c\\). Our study shows the emergence of a complex interplay of short- and long-range interactions below \\(T^{\\prime}_c\\) as CGT approaches the 2D limit.