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

Abstract

No abstract prepared.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA
Sponsoring Org.:
USDOE Office of Science and Technology (OST) - (EM-50)
OSTI Identifier:
888514
Report Number(s):
IS-J 7112
TRN: US200618%%129
DOE Contract Number:
W-7405-Eng-82
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review B; Journal Volume: 73; Journal Issue: 18
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; PRESSURE DEPENDENCE; MATERIAL SUBSTITUTION; LANTHANUM ALLOYS; SILVER ALLOYS; ANTIMONY ALLOYS; CHARGE DENSITY

Citation Formats

S.L. Bud'ko, T.A. Wiener, R.A. Ribeiro, P.C. Canfield, Y. Lee, T. Vogt, and A.H. Lacerda. Effect of Pressure and Chemical Substitutions on the Charge-Density-Wave in LaAgSb2. United States: N. p., 2006. Web.
S.L. Bud'ko, T.A. Wiener, R.A. Ribeiro, P.C. Canfield, Y. Lee, T. Vogt, & A.H. Lacerda. Effect of Pressure and Chemical Substitutions on the Charge-Density-Wave in LaAgSb2. United States.
S.L. Bud'ko, T.A. Wiener, R.A. Ribeiro, P.C. Canfield, Y. Lee, T. Vogt, and A.H. Lacerda. Wed . "Effect of Pressure and Chemical Substitutions on the Charge-Density-Wave in LaAgSb2". United States. doi:.
@article{osti_888514,
title = {Effect of Pressure and Chemical Substitutions on the Charge-Density-Wave in LaAgSb2},
author = {S.L. Bud'ko and T.A. Wiener and R.A. Ribeiro and P.C. Canfield and Y. Lee and T. Vogt and A.H. Lacerda},
abstractNote = {No abstract prepared.},
doi = {},
journal = {Physical Review B},
number = 18,
volume = 73,
place = {United States},
year = {Wed May 10 00:00:00 EDT 2006},
month = {Wed May 10 00:00:00 EDT 2006}
}
  • 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.
  • 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.