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http://hdl.handle.net/11375/9409
Title: | Neutron Scattering Studies of La2_xBaxCuO4 |
Authors: | Van, Gastel J. Gregory |
Advisor: | Gaulin, B. D. |
Department: | Physics |
Keywords: | Physics;Physics |
Publication Date: | Sep-2009 |
Abstract: | <p>Elastic neutron scattering studies have been performed on high quality single crystal samples of lightly doped La<sub>2_x</sub>Ba<sub>x</sub>CuO<sub>4</sub> with concent rations of x=0, 0.006, 0.0125 and 0.025. These samples display x dependent magnetic structures with transition temperatures which closely follow the usual phase diagram for this material. A low temperature, 2D antiferromagnetic transition has been observed in samples with hole concent ration near the 'spin-glass' transition at x~0.02. In data collected on the N5 triple axis spectrometer at Chalk River, the sample with x=0.0125 demonstrates the onset of 3D antiferromagnetism with T<sub>N</sub> ~ 151K, followed by attenuation of the scattering intensity of the (1/2,1/2,0) magnetic Bragg peak below T=21K, indicating the onset of 2D magnetic ordering. This result is similar to that obtained by Matsuda et al. in lightly doped La<sub>2_x</sub>Sr<sub>x</sub>CuO<sub>4</sub>.[1] This result is confirmed by direct observations of 2D 'rods ' of magnetic scattering in time-of-flight measurements performed on the Disk Chopper Spectrometer at NIST.</p> |
URI: | http://hdl.handle.net/11375/9409 |
Identifier: | opendissertations/4535 5554 2047615 |
Appears in Collections: | Open Access Dissertations and Theses |
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fulltext.pdf | 24.71 MB | Adobe PDF | View/Open |
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