Magnetic phase transitions in Eu( Co1−xNix)2−yAs2 single crystals

Magnetic and structural transitions in La0.4Na0.6Fe2As2 single crystals

La0.4Na0.6Fe2As2 single crystals have been grown out of an NaAs flux in an alumina crucible and characterized by measuring magnetic susceptibility, electrical resistivity, specific heat, as well as single-crystal x-ray and neutron diffraction. La0.4Na0.6Fe2As2 single crystals show a structural phase transition from a high-temperature tetragonal phase to a low-temperature orthorhombic phase at T...

Phase transitions in liquid crystals

Phase Transitions and Critical Phenomena.phase Transitions in Liquid Crystals

The present text is the transcription of an introductory lecture discussing two phase transitions : nematic-isotropic and smectic A-nematic. The emphasis is on simple qualitative features, including Landau ~heories, coherence lengths and scaling properties.

Ultrafast Single Shot X-Ray Imaging of Magnetic Phase Transitions

We propose an experiment that makes full use of the unique capabilities offered by LCLS to image the critical fluctuations in a ferromagnetic film in the vicinity of its Curie temperature. The high intensity, femtosecond time structure, and coherence of the LCLS x-ray pulses will enable us to record ultrafast consecutive images of critical fluctuations using a newly developed lensless imaging t...

Anisotropic magnetic order of the Eu sublattice in single crystals of

We present a combination of magnetization and magnetic torque experiments to investigate the magnetic orders in undoped EuFe2As2 and Co-doped EuFe1.8Co0.2As2 single crystals. Although at low temperatures typical results for an antiferromagnetic (AFM) state in EuFe2As2 were found, our data strongly indicate the occurrence of a canted antiferromagnetic (C-AFM) order of the Eu2+ moments between 17...