Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-08-24
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures
Scientific paper
10.1088/0953-8984/14/5/102
Experimental investigation of the resistivity $\rho$, susceptibility $\chi$, specific heat C$_p$, and Hall coefficient R$_H$ of the pyrochlore Cd$_2$Re$_2$O$_7$ reveals the presence of a continuous phase transition of uncertain origin with critical temperature T* = 200 K. Electron and X-ray diffraction measurements indicate that a commensurate structural transformation accompanies the changes in the electronic properties, implying that lattice as well as electronic degrees of freedom are involved in the transition. Remarkable scaling relationships between $\rho$, $\chi$, and C$_p$ are observed, indicating that fluctuations are crucial in the transition regime. Scenarios involving both spin and ionic density fluctuations are considered in the evaluation of the data. Although the observed structural transition suggests that ionic density fluctuations are likely to be important, a scaling relationship between $\rho$ and $\chi$ over a wide temperature range suggests that spin fluctuations may be playing a role as well.
Chisholm Matthew F.
He Jingsong
Jin Rongying
Mandrus David
Sales Brian C.
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