Low temperature phase transitions and magnetic structure of PrB6 |
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Authors: | CM McCarthy CW Tompson RJ Graves HW White Z Fisk HR Ott |
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Institution: | Physics Department, University of Missouri, Columbia, Missouri 65211, USA;Institute for Pure and Applied Physical Sciences University of California, San Diego, La Jolla, California 92093, USA;Laboratorium für Festkörperphysik Eidgenössische Technische Hochschule, Zürich, Switzerland |
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Abstract: | Specific heat, thermal expansion and electrical resistivity measurements on PrB6 single crystals show that there are two low temperature phase transitions at 6.9 K and 4.2 K, respectively, the latter temperature varying somewhat among different crystals. Neutron diffraction measurements were made on both single and polycrystalline samples of PrB6. The neutron data indicate a spontaneous incommensurate magnetic ordering at 6.9 K with Q = (0.23, 0.23, 0.5) 2π/ao. At 4.2 K a commensurate magnetic phase is seen with Q = (0.25, 0.25, 0.5) 2π/ao coexisting with the incommensurate phase At 1.74 K, only the commensurate phase remains. A model is proposed for the commensurate antiferromagnetic structure and a profile analysis based on that model yields a magnetic moment of 1.77 Bohr magnetons per praseodymium ion at 1.74 K. |
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