Structural Order Parameter in the Pyrochlore Superconductor Cd_2Re_2O_7 (Condensed Matter: Structure, Mechanical and Thermal Properties)

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概要

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• It is shown that both structural phase transitions in Cd_2Re_20_7, which occur at T_<s1>=200K and T_<s2>=120K, are due to an instability of the Re tetrahedral network with respect to the same doubly degenerate long-wavelength phonon mode. The primary structural order parameter transforms according to the irreducible representation E_u of the point group O_h. We argue that the transition at T_<s1> may be of the second order, in accordance with experimental data. We obtain the phase diagram in the space of phenomenological parameters and propose a thermodynamic path that Cd_2Re_2O_7 follows upon cooling. Couplings of the itinerant electronic system and localized spin states in pyrochlores and spinels to atomic displacements are discussed.

• 社団法人日本物理学会の論文
• 2003-07-15

著者

• Sergienko Ivan

  Department Of Physics And Physical Oceanography Memorial University Of Newfoundland

• CURNOE Stephanie

  Department of Physics and Physical Oceanography, Memorial University of Newfoundland

• Curnoe S

  Department Of Physics And Physical Oceanography Memorial University Of Newfoundland

• Curnoe Stephanie

  Department Of Physics And Physical Oceanography Memorial University Of Newfoundland

関連論文

• Structural Order Parameter in the Pyrochlore Superconductor Cd_2Re_2O_7 (Condensed Matter: Structure, Mechanical and Thermal Properties)
• Structural Order Parameter in the Pyrochlore Superconductor Cd_2Re_2O_7
• Landau Theory of Domain Patterns in Ferroelastics

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