The temperature and field dependencies of magnetization of NdFeAsO0.94F0.06 bulk sample are shown to exhibit the Curie-Weiss behaviour, both in the superconducting and normal states. To address the origin of the strong paramagnetic signal, particularly to reveal contributions from antiferromagnetic second phases in sintered NdFeAsO0.94F0.06, the magnetic response of Nd2O3 was measured and compa...

Bulk magnetization measurements (5-320 K; 0-8T) reveal that below room temperature Mn0.9Ti0.1CoGe exhibits two magnetic phase transitions at ~178 K and ~280 K. Neutron diffraction measurements (3-350K) confirm that the transition at ~178K is due to the structural change from the low-temperature orthorhombic TiNiSi-type structure to the higher temperature hexagonal Ni2In-type structure while the...

The magnetic susceptibility of adrenal iron-sulfur protein (adrenodoxin) in the oxidized and reduced states was measured over the temperature range 4”-260°K. The oxidized protein was diamagnetic in the entire temperature range, and the reduced protein exhibited a paramagnetism without any deviation from Curie’s law (S = l/2). None of the theoretical curves based on exchange interaction energy b...

We establish a mapping of a general spin-fermion system in one dimension into a classical generalized Coulomb gas. This mapping allows a renormalization-group treatment of the anisotropic Kondo chain both at and away from half-filling. We find that the phase diagram contains regions of paramagnetism, partial, and full ferromagnetic order. We also use the method to analyze the phases of the Isin...

We demonstrate the existence of a simple physical picture of superconductivity for extremely overdoped CuO2 planes. It possesses all characteristic features of HTS, such as a high superconducting transition temperature, the dx2−y2 symmetry of order parameter, and the coexistence of a single electron Fermi surface and a pseudogap in the normal state. Values of pseudogap are calculated for differ...

....................................................................................................................................... ix Chapter 1: Introduction ........................................................................................................ 1 1.1 General Introduction ........................................................................................... 1 1.2 Moti...

Measurements of the perpendicular upper critical magnetic field H c2⊥ (T) are reported for several Nb/CuMn multilayers. It is found that, despite the magnetic nature of the samples, the data for samples with low Mn percentage in the CuMn layers are simply described by the Werthamer-Helfand-Honenberg theory for conventional type-II superconductors, neglecting both Pauli spin paramagnetism and sp...

We investigate the 2D ferromagnetic Kondo lattice model for manganites with classical corespins at Hund’s rule coupling JH = 6, with antiferromagnetic superexchange 0.03 ≤ J ′ ≤ 0.05. We employ canonical and grand canonical unbiased Monte Carlo simulations and find paramagnetism, weak ferromagnetism and the Flux phase, depending on doping and on J . The observed single particle spectrum in the ...

New techniques for imaging of brain function are described, which utilize magnetic resonance imaging. Echo-planar imaging (EPI), the preferred method, is introduced and technical issues are discussed. Two recent approaches for measurement of blood flow are explained: contrast agent bolus tracking and black blood perfusion. An intrinsic contrast technique, which utilizes the paramagnetism of deo...