Low-temperature structural change and magnetic anomaly in superconducting Cd2Re2O7
Hironori Sakai, Harukazu Kato, Shinsaku Kambe, Russell E. Walstedt, Hiroyuki Ohno, Masaki Kato, Kazuyoshi Yoshimura, Hirofumi Matsuhata
DOI 10.1103/PhysRevB.66.100509 · Physical Review B
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Abstract
The structural phase transition at T*∼200K in the superconducting pyrochlore oxide Cd2Re2O7 has been investigated using x-ray and electron diffraction experiments and 111Cd-NMR (nuclear-magnetic-resonance) measurements. The susceptibility for Cd2Re2O7 in the high-temperature region (T≫T*) obeys a Curie-Weiss law with a large and negative Weiss temperature, which indicates that this system possesses a localized-moment nature with antiferromagnetic interactions, leading to geometrical frustration. X-ray and electron-diffraction measurements suggest the tetramerization of Re below T*, which induces a nanosized stripe structure. From 111Cd-NMR experiments, a large orbital susceptibility is identified by means of a K−χ plot. Both the spin susceptibility and (T1T)−1 are found to decrease sharply below T*, signaling a decrease in density of states, which is apparently caused by a developing partial energy gap at the Fermi surface.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Cd2Re2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.1 | Pressure not reported | unknown |
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