摘要:

Pioneering work in the field of ultracold neutron (UCN) research at Dubna and Garching has generated an ever growing interest in strong UCN sources over the past 2decades. UCNs became a useful tool in a variety of applications; these include optical experiments, (neutron microscope, wave optics), the measurement of the neutron lifetime by bottle experiments, the search of an electric dipole moment of the neutron, and applications in highest resolution diffractometry and spectroscopy.

ISSN:1044-8632    

DOI:10.1080/10448639008210197

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

Neutron powder diffraction has proved to be important for understanding the structures of the new oxide supercon- ductors because of the lack of single crystals, and because of the need to locate oxygen atoms in the presence of heavy metal atoms such as barium and bismuth.

ISSN:1044-8632    

DOI:10.1080/10448639008210198

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

All of the copper oxide superconductors contain CuO2layers which, when insulating, exhibit strong, two-dimensional (2D) antiferromagnetic correlations due to the unusually large superexchange interaction between nearest-neighbor Cu2+atoms. Magnetic correlations survive, although with a reduced correlation length, even when the layers are doped with holes. A short review of neutron scattering studies of magnetic correlations and excitations in the layered cuprates is presented.

ISSN:1044-8632    

DOI:10.1080/10448639008210199

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor