caa a22 4500 467884625 CHVBK 20180406152730.0 cr unu---uuuuu 170328e20060201xx s 000 0 eng 10.1007/s10948-005-0101-3 doi (NATIONALLICENCE)springer-10.1007/s10948-005-0101-3 X-Ray Diffraction Study of Correlated Electron System at Low Temperatures [Elektronische Daten] [Haruhiko Suzuki, Yun Xue, Akiko Hosomichi, Shumsun Naher, Fumiaki Hata, Hiroshi Kaneko] By using an ultra-low temperature X-ray diffractometer, we studied low temperature phase transitions of several materials. These phase transitions are classified into a ferro quadrupole ordered phase, that is, Jahn-Teller distortion (TmVO $$_4$$ , ZnCr $$_2$$ O $$_4$$ ), an antiferro quadrupole ordered phase (CeB $$_6$$ , PrPb $$_3$$ ), and a superconducrivity (MgB $$_2$$ ). We also investigated unknown phases, such as the low temperature phase in PrPtBi and the 4th phase in Ce $$_{0.7}$$ La $$_{0.3}$$ B $$_6$$ . Our low temperature X-ray measurement gives rise to a fruitful information about the phase transition. Not only a whole profile of the reflection peaks, which can be analyzed by the Rietveld method, we also made the precise measurement of the temperature dependence of the integrated intensity of the reflection peak, the full width at half maximum, and the lattice spacing for some fixed reflections. The temperature dependence of the integrated intensity (I.I.) can be expressed by the Debye-Waller expression. At low temperatures, the change of the phonon frequency can be obtained from the I.I. through the Debye-Waller factor. In MgB $$_2$$ we observed the hardening of the phonon and the softening of phonon above and below the superconducting transition temperature, respsctively. This result suggests the relevant mechanisim of superconductivity in MgB $$_2$$ is the electron-phonon interaction. From the precise measurement of the lattice constant, we found the negative thermal expansion at low temperatures in many correlated electron system. This negative thermal expansion can be explained by the Fermi liquid theory by Misawa. Springer Science+Business Media, Inc., 2006 low temperature X-ray diffraction nationallicence negative thermal expansion nationallicence MgB2 nationallicence Debye-Waller factor nationallicence Suzuki Haruhiko Department of Physics, Kanazawa University, Kakuma-machi, 920-1192, Kanazawa, Japan aut Xue Yun Department of Physics, Kanazawa University, Kakuma-machi, 920-1192, Kanazawa, Japan aut Hosomichi Akiko Department of Physics, Kanazawa University, Kakuma-machi, 920-1192, Kanazawa, Japan aut Naher Shumsun Department of Physics, Kanazawa University, Kakuma-machi, 920-1192, Kanazawa, Japan aut Hata Fumiaki Department of Physics, Kanazawa University, Kakuma-machi, 920-1192, Kanazawa, Japan aut Kaneko Hiroshi Department of Physics, Kanazawa University, Kakuma-machi, 920-1192, Kanazawa, Japan aut Journal of Superconductivity and Novel Magnetism Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 19/1-2(2006-02-01), 89-94 1557-1939 19:1-2<89 2006 19 10948 https://doi.org/10.1007/s10948-005-0101-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-005-0101-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Suzuki Haruhiko Department of Physics, Kanazawa University, Kakuma-machi, 920-1192, Kanazawa, Japan aut NATIONALLICENCE 700 1- Xue Yun Department of Physics, Kanazawa University, Kakuma-machi, 920-1192, Kanazawa, Japan aut NATIONALLICENCE 700 1- Hosomichi Akiko Department of Physics, Kanazawa University, Kakuma-machi, 920-1192, Kanazawa, Japan aut NATIONALLICENCE 700 1- Naher Shumsun Department of Physics, Kanazawa University, Kakuma-machi, 920-1192, Kanazawa, Japan aut NATIONALLICENCE 700 1- Hata Fumiaki Department of Physics, Kanazawa University, Kakuma-machi, 920-1192, Kanazawa, Japan aut NATIONALLICENCE 700 1- Kaneko Hiroshi Department of Physics, Kanazawa University, Kakuma-machi, 920-1192, Kanazawa, Japan aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 19/1-2(2006-02-01), 89-94 1557-1939 19:1-2<89 2006 19 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer