Phys. Rev. B 62, 8725–8730 (2000)

Temperature and pressure effects on the crystal structure of Sr₃Ru₂O₇: Evidence for electronically driven structural responses

Abstract

References

Citing Articles (21)

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H. Shaked^*, J. D. Jorgensen, and S. Short
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439

O. Chmaissem
Department of Physics, Northern Illinois University, Dekalb, Illinois 60115
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439

S.-I. Ikeda^†
Department of Physics, Kyoto University, Kyoto 606-8502, Japan

Y. Maeno
Department of Physics, Kyoto University, Kyoto 606-8502, Japan
Core Research for Evolutionary Science, Japan Science and Technology Corporation, Kawaguchi, Saitama 332-0012, Japan

Received 4 May 2000; published in the issue dated 1 October 2000

The crystal structure of the ruthenate Sr₃Ru₂O₇ as a function of temperature (5–305 K) and pressure (ambient -0.62 GPa) was studied by neutron diffraction. Upon cooling, the lattice parameter c and the rotation angle of the oxygen octahedra φ increase for 305K>T>50K, and decrease for 20K>T>5K. As pressure is applied at room temperature, the outer apical Ru-O bond expands. This remarkable behavior is discussed in terms of modification of the occupation of energy levels of the Ru⁴⁺ ion in the crystalline electric field of the oxygen octahedron and a crossover to Fermi-liquid behavior at low temperature. The very anisotropic thermal expansion leads, in sintered powder samples, to a high degree of strain, which is relieved somewhat with each cooling cycle.

URL:

http://link.aps.org/doi/10.1103/PhysRevB.62.8725

DOI:

10.1103/PhysRevB.62.8725

PACS:

61.12.-q, 64.70.Kb

^*Permanent address: Department of Physics, Ben-Gurion University of the Negev, P.O.B. 653, Beer Sheva 84190, Israel.

^†Permanent address: Physical Science Division, Electrotechnical Laboratory, Umezono 1-1-4, Tsukuba 305-8568, Japan.

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Phys. Rev. B 62, 8725–8730 (2000)

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Temperature and pressure effects on the crystal structure of Sr₃Ru₂O₇: Evidence for electronically driven structural responses