Structural Order Parameter in the Pyrochlore Superconductor Cd2Re2O7

Details Structural Order Parameter in the Pyrochlore Superconductor Cd2Re2O7 Structural Order Parameter in the Pyrochlore Superconductor Cd2Re2O7

2003-01-03

arxiv.org/abs/cond-mat/0301029v2

J. Phys. Soc. Jpn. 72, 1607 (2003), Letter.

Physics

Condensed Matter

Superconductivity

5 pages. Submitted to J. Phys. Soc. Jpn. Best quality figures are available at http://www.physics.mun.ca/~isergien/pubs.html

Scientific paper

10.1143/JPSJ.72.1607

It is shown that both structural phase transitions in Cd2Re2O7, which occur at T_{s1}=200 K and T_{s2}=120 K, 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 second order, in accordance with experimental data. We obtain the phase diagram in the space of phenomenological parameters and propose a thermodynamic path that Cd2Re2O7 follows upon cooling. Couplings of the itinerant electronic system and localized spin states in pyrochlores and spinels to atomic displacements are discussed.

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