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Title: Spin-charge-lattice coupling near the metal-insulator transition in Ca{sub 3}Ru{sub 2}O{sub 7}

Abstract

We report x-ray scattering studies of the c-axis lattice parameter in Ca{sub 3}Ru{sub 2}O{sub 7} as a function of temperature and magnetic field. These structural studies complement published transport and magnetization data, and therefore elucidate the spin-charge-lattice coupling near the metal-insulator transition. Strong anisotropy of the structural change for field applied along orthogonal in-plane directions is observed. Competition between a spin-polarized phase that does not couple to the lattice and an antiferromagnetic metallic phase that does gives rise to a rich behavior for B parallel b.

Authors:
; ; ; ; ; ;  [1];  [2];  [2];  [3];  [3]
  1. National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)
  2. (Germany)
  3. (Japan)
Publication Date:
OSTI Identifier:
20951512
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 75; Journal Issue: 21; Other Information: DOI: 10.1103/PhysRevB.75.212403; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; ANTIFERROMAGNETIC MATERIALS; ANTIFERROMAGNETISM; CALCIUM COMPOUNDS; COMPETITION; COUPLING; LATTICE PARAMETERS; MAGNETIC FIELDS; RUTHENIUM COMPOUNDS; SPIN; SPIN ORIENTATION; TEMPERATURE DEPENDENCE; X-RAY DIFFRACTION

Citation Formats

Nelson, C. S., Mo, H., Bohnenbuck, B., Strempfer, J., Kikugawa, N., Ikeda, S. I., Yoshida, Y., Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Hamburger Synchrotronstrahlungslabor HASYLAB at Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22603 Hamburg, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, and National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568. Spin-charge-lattice coupling near the metal-insulator transition in Ca{sub 3}Ru{sub 2}O{sub 7}. United States: N. p., 2007. Web. doi:10.1103/PHYSREVB.75.212403.
Nelson, C. S., Mo, H., Bohnenbuck, B., Strempfer, J., Kikugawa, N., Ikeda, S. I., Yoshida, Y., Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Hamburger Synchrotronstrahlungslabor HASYLAB at Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22603 Hamburg, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, & National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568. Spin-charge-lattice coupling near the metal-insulator transition in Ca{sub 3}Ru{sub 2}O{sub 7}. United States. doi:10.1103/PHYSREVB.75.212403.
Nelson, C. S., Mo, H., Bohnenbuck, B., Strempfer, J., Kikugawa, N., Ikeda, S. I., Yoshida, Y., Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Hamburger Synchrotronstrahlungslabor HASYLAB at Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22603 Hamburg, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, and National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568. Fri . "Spin-charge-lattice coupling near the metal-insulator transition in Ca{sub 3}Ru{sub 2}O{sub 7}". United States. doi:10.1103/PHYSREVB.75.212403.
@article{osti_20951512,
title = {Spin-charge-lattice coupling near the metal-insulator transition in Ca{sub 3}Ru{sub 2}O{sub 7}},
author = {Nelson, C. S. and Mo, H. and Bohnenbuck, B. and Strempfer, J. and Kikugawa, N. and Ikeda, S. I. and Yoshida, Y. and Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse 1, D-70569 Stuttgart and Hamburger Synchrotronstrahlungslabor HASYLAB at Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22603 Hamburg and National Institute for Materials Science, Tsukuba, Ibaraki 305-0047 and National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568},
abstractNote = {We report x-ray scattering studies of the c-axis lattice parameter in Ca{sub 3}Ru{sub 2}O{sub 7} as a function of temperature and magnetic field. These structural studies complement published transport and magnetization data, and therefore elucidate the spin-charge-lattice coupling near the metal-insulator transition. Strong anisotropy of the structural change for field applied along orthogonal in-plane directions is observed. Competition between a spin-polarized phase that does not couple to the lattice and an antiferromagnetic metallic phase that does gives rise to a rich behavior for B parallel b.},
doi = {10.1103/PHYSREVB.75.212403},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 21,
volume = 75,
place = {United States},
year = {Fri Jun 01 00:00:00 EDT 2007},
month = {Fri Jun 01 00:00:00 EDT 2007}
}
  • We report a Raman-scattering study of the relationship among the charge, spin, and lattice dynamics of Ca{sub 3}Ru{sub 2}O{sub 7}. The metal-insulator (MI) transition (T{sub MI}{approximately}48 K) in this compound manifests itself as a rapid suppression of low-frequency electronic scattering intensity, reflecting the opening of a charge gap, {Delta}{sub c}{approximately}760 cm{sup {minus}1}, and a concomitant softening and broadening of the 438 cm{sup {minus}1} out-of-phase oxygen phonon mode. Furthermore, the transition to antiferromagnetic order below T{sub N}{approximately}56 K is associated with the development of a B{sub 1g} resonance peak near 58 cm{sup {minus}1}. We identify this feature as a two-magnon process,more » based upon which we estimate an in-plane antiferromagnetic exchange coupling of J{sub {parallel}}{approximately}8.7 cm{sup {minus}1} in Ca{sub 3}Ru{sub 2}O{sub 7}. {copyright} {ital 1999} {ital The American Physical Society}« less
  • Single crystal Ca{sub 3}Ru{sub 2}O{sub 7} shows a metallic antiferromagnetic phase intermediate between a first-order metal to nonmetal transition at T{sub M}=48K and the antiferromagnetic ordering (N{acute e}el) temperature, T{sub N}=56K. The metallic antiferromagnetic phase is predicted within various Mott-Hubbard models. Magnetization and electrical resistivity reveal strongly anisotropic metamagnetism in the nonmetallic antiferromagnetic phase. The charge and spin excitations are strongly coupled: The H-T phase diagrams determined by magnetization and magnetoresistivity are indistinguishable and reveal a multicritical point. The heat capacity of Ca{sub 3}Ru{sub 2}O{sub 7} suggests it is a highly correlated electron system. {copyright} {ital 1997} {ital The Americanmore » Physical Society}« less
  • Correlation between structure and transport properties are investigated in high-quality single-crystals of Ca{sub 2}Ru{sub 1-x}Cr{sub x}O{sub 4} with 0<x<0.14 using single crystal X-ray diffraction and by electronic studies. The parent compound was known to exhibit an intriguing first-order structurally driven metal-insulator (MI) transition at 357 K. Upon chromium doping on the ruthenium site, the metal-insulator transition temperature (T{sub MI}) was drastically reduced, and is related to the competition between structural changes that occur upon Cr doping and with decreasing temperature. A strong suppression of structural distortions with increasing Cr substitution was identified. No clear T{sub MI} can be observed whenmore » x>13.5% and the system behaves as an insulator. Such a large, sharp metal-insulator transition and tuneable transition temperature may have potential applications in electronic devices. -- Graphical abstract: The metal-insulator transition temperature (T{sub MI}) was drastically reduced by Cr doping, and is closely related to the distortion of structure. Display Omitted Research highlights: {yields} The metal-insulator transition temperature (T{sub MI}) was drastically reduced by doping Cr into Ca{sub 2}RuO{sub 4} single crystal. {yields} Detailed single crystal structural analysis provided important insight into this structurally-driven metal-insulator transition. {yields} Negative Volume Thermal Expansion (NVTE) was observed with increasing temperature.« less