4,811 research outputs found
Exchange bias-like magnetic properties in Sr2LuRuO6
Exchange bias properties are observed in a double perovskite compound,
Sr2LuRuO6. The observed exchange bias properties have been analyzed on the
basis of some of the available theoretical models. Detailed magnetization
measurements show that the exchange bias properties are associated with the
Dzyaloshinsky-Moria (D-M) interaction among the antiferromagnetically ordered
Ru moments (TN~32K). In addition to the usual canting of the antiferromagnetic
moments, D-M interaction in this compound also causes a magnetization reversal
at T~26K, which seems to trigger the exchange bias properties. Heat capacity
measurements confirm the two magnetic anomalies.Comment: 5 Pages, 6 Figure
Incentives, Reputation and the Allocation of Authority
We address the question how much authority a principal should delegate to a manager with conflicting interests and uncertain ability in a context in which the manager has both compensationbased and reputational incentives. The optimal level of authority balances the value of the manager’s decision-making expertise against the cost of ensuring that the manager uses his discretion productively. Reputational incentives reduce the necessary monetary incentives to discourage purely opportunistic behavior, but may cause the manager to pursue conservative courses of action to preserve his reputation. This undermines the benefits of delegating control, leading to decreased managerial authority and stronger monetary incentives. When the principal can commit to long-term contracts, she eliminates this conservative bias by rewarding a successful manager with greater future compensation and authority than would be optimal in a static setting. Early in the relationship the principal may delegate additional authority in order to screen for managers of high ability
Relative volume of separable bipartite states
Every choice of an orthonormal frame in the d-dimensional Hilbert space of a
system corresponds to one set of all mutually commuting density matrices or,
equivalently, a classical statistical state space of the system; the quantum
state space itself can thus be profitably viewed as an SU(d) orbit of classical
state spaces, one for each orthonormal frame. We exploit this connection to
study the relative volume of separable states of a bipartite quantum system.
While the two-qubit case is studied in considerable analytic detail, for higher
dimensional systems we fall back on Monte Carlo. Several new insights seem to
emerge from our study.Comment: Essentially the published versio
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