The quantum critical point in CeRhIn_5: a resistivity study

The pressure--temperature phase diagram of CeRhIn_5 has been studied under high magnetic field by resistivity measurements. Clear signatures of a quantum critical point has been found at a critical pressure of p_c = 2.5 GPa. The field induced magnetic state in the superconducting state is stable up to the highest field. At p_c the antiferromagnetic ground-state under high magnetic field collapses very rapidly. Clear signatures of p_c are the strong enhancement of the resistivity in the normal state and of the inelastic scattering term. No clear T2 temperature dependence could be found for pressures above T_c. From the analysis of the upper critical field within a strong coupling model we present the pressure dependence of the coupling parameter lambda and the gyromagnetic ratio g. No signatures of a spatially modulated order parameter could be evidenced. A detailed comparison with the magnetic field--temperature phase diagram of CeCoIn_5 is given. The comparison between CeRhIn_5 and CeCoIn_5 points out the importance to take into account the field dependence of the effective mass in the calculation of the superconducting upper critical field H_c2. It suggests also that when the magnetic critical field H_(0) becomes lower than H_c2 (0)$, the persistence of a superconducting pseudo-gap may stick the antiferromagnetism to H_c2 (0).Comment: 15 pages, 20 figures, to be published in J. Phys. Soc. Jp

Home oxygen management of neonatal chronic lung disease in Western Australia

Objective: To describe the course and management of infants with neonatal chronic lung disease who were discharged home on low-flow supplemental oxygen

Neuroendocrine influences in psychoimmunology and neoplasia: A review

Much recent work has focused on the interrelationships among environmental. psychological and physiological phenomena involved in immune-related disorders. with special emphasis being given to neoplastic processes. The present review looks first at the physiological pathways involved in the body's assorted and alternating responses to stressful environmental and psychological conditions and the immune system sequelae following each of two distinct psychophysiological coping responses-active coping and passive coping/helplessness reaction. Psychoimmunological findings about stressful life events. bereavement and mental depression as stressors the integrated with current psychoneuroimmunological postulates. A framework is outlined that may have utility for understanding the relationship among chronic psychological emotional stress in its many forms, accompanying neurohormonal changes. and increased susceptibility to immune-mediated neoplastic growth. Finally, the recently evolved concepts of hyper-adaptosis and cancrophilia are employed to further integrate theoretical pathways with clinical findings in the hopes of presenting a fertile base on which others may plan and conduct empirical research and intervention strategies