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Title: Effect of Pressure and Chemical Substitutions on the Charge-Density-Wave in LaAgSb2

Abstract

We present data on the crystal structure and evolution of the electrical resistivity in lightly doped La{sub 1-x}R{sub x}AgSb{sub 2} (R=Gd, Y, Ce, and Nd) at ambient pressure and in LaAgSb{sub 2} under hydrostatic pressure. The upper charge density wave transition is suppressed by both doping and pressure with substitution-related disorder being the dominant mechanism for this suppression in the former case and the anisotropic pressure dependence of the unit cell dimensions (as seen in the c/a ratio) prevailing in the latter case.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
914041
Report Number(s):
BNL-78609-2007-JA
Journal ID: ISSN 0163-1829; PRBMDO; TRN: US200804%%308
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys. Rev. B; Journal Volume: 73
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CRYSTAL STRUCTURE; ELECTRIC CONDUCTIVITY; LANTHANUM ALLOYS; SILVER ALLOYS; ANTIMONY ALLOYS; DOPED MATERIALS; GADOLINIUM; YTTRIUM; CERIUM; NEODYMIUM; PRESSURE DEPENDENCE; CHARGE DENSITY; national synchrotron light source

Citation Formats

Budko,S., Weiner, T., Ribeiro, R., Canfield, P., Lee, Y., Vogt, T., and Lacerda. Effect of Pressure and Chemical Substitutions on the Charge-Density-Wave in LaAgSb2. United States: N. p., 2006. Web. doi:10.1103/PhysRevB.73.184111.
Budko,S., Weiner, T., Ribeiro, R., Canfield, P., Lee, Y., Vogt, T., & Lacerda. Effect of Pressure and Chemical Substitutions on the Charge-Density-Wave in LaAgSb2. United States. doi:10.1103/PhysRevB.73.184111.
Budko,S., Weiner, T., Ribeiro, R., Canfield, P., Lee, Y., Vogt, T., and Lacerda. Sun . "Effect of Pressure and Chemical Substitutions on the Charge-Density-Wave in LaAgSb2". United States. doi:10.1103/PhysRevB.73.184111.
@article{osti_914041,
title = {Effect of Pressure and Chemical Substitutions on the Charge-Density-Wave in LaAgSb2},
author = {Budko,S. and Weiner, T. and Ribeiro, R. and Canfield, P. and Lee, Y. and Vogt, T. and Lacerda},
abstractNote = {We present data on the crystal structure and evolution of the electrical resistivity in lightly doped La{sub 1-x}R{sub x}AgSb{sub 2} (R=Gd, Y, Ce, and Nd) at ambient pressure and in LaAgSb{sub 2} under hydrostatic pressure. The upper charge density wave transition is suppressed by both doping and pressure with substitution-related disorder being the dominant mechanism for this suppression in the former case and the anisotropic pressure dependence of the unit cell dimensions (as seen in the c/a ratio) prevailing in the latter case.},
doi = {10.1103/PhysRevB.73.184111},
journal = {Phys. Rev. B},
number = ,
volume = 73,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}
  • No abstract prepared.
  • The charge density wave transition is investigated in the bilayer family of rare-earth tritelluride RTe{sub 3} compounds (R=Sm, Gd, Tb, Dy, Ho, Er, and Tm) via high-resolution x-ray diffraction and electrical resistivity. The transition temperature increases monotonically with increasing lattice parameter from 244(3) K for TmTe{sub 3} to 416(3) K for SmTe{sub 3}. The heaviest members of the series, R=Dy, Ho, Er, and Tm, are observed to have a second transition at a lower temperature, which marks the onset of an additional charge density wave with wave vector almost equal in magnitude to the first, but oriented in the perpendicularmore » direction.« less
  • The hydrostatic pressure dependence of the charge-density-wave onset temperature T/sub 0/ in 2H-NbSe/sub 2/ was measured up to 20 kbar. dT/sub 0//dP was found to be - (3.3 +- 0.2) x 10/sup -4/ K bar/sup -1/. An examination of existing high pressure data concerning structural instabilities and superconductivity in both layered and isotropic compounds is made. (AIP)
  • The influence of an oscillatory chemical potential {tilde {mu}} within the gap equation of a commensurate charge-density wave (CDW) is shown to lead to a new type of quantum oscillatory effect in the susceptibility of the nested one-dimensional sheets, with frequency exactly double that of the two-dimensional pocket from which oscillations in {tilde {mu}} originate. On approaching the Pauli paramagnetic limit, {tilde {mu}} further leads to a cascade of multiple first-order phase transitions between CDW and normal metallic phases. These ideas are applied to {alpha}-(BEDT{minus}TTF){sub 2}MHg(SCN){sub 4} charge-transfer salts. {copyright} {ital 1999} {ital The American Physical Society}
  • We report the pressure dependence up to 95 kbar of Raman-active stretching modes in the quasi-one-dimensional [ital MX] chain solid Pt[sub 2]Br[sub 6](NH[sub 3])[sub 4]. The data indicate that a predicted pressure-induced insulator-to-metal transition does not occur, but are consistent with the solid undergoing either a three-dimensional structural distortion or a transition from a charge-density wave to another broken-symmetry ground state. We show that such a transition can be well modeled within a Peierls-Hubbard Hamiltonian.