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Title: Spin dynamics in pure and Zn-doped CuGeO{sub 3} by muon spin relaxation: Spin-Peierls and spin-glass transitions

Abstract

Zero and longitudinal muon spin relaxation has been used to characterize the spin dynamics of local magnetic moments in the quasi-one-dimensional {ital S}=1/2 cuprates CuGeO{sub 3} and Cu{sub 0.96}Zn{sub 0.04}GeO{sub 3}. Frozen moments are not observed in CuGeO{sub 3}, only a slowing down of the fluctuating rate of Cu moments was seen below 14 K. Magnetic measurements in the slightly doped sample confirm the suppression of the spin-singlet transition, and the appearance of hysteresis between the zero-field-cooled and field-cooled branches of the magnetic susceptibility below {ital T}{approx}4.5 K, both absent in the pure compound. The depolarization of muons gives evidence of the appearance of randomly frozen Cu moments in the doped compound below {ital T}{sub {ital g}}{approx}4.5 K. The dynamic relaxation rate {lambda}{sub {ital d}} is appreciably higher around {ital T}{sub {ital g}} than below 4 K, and the correlation time {tau}{sub {ital c}} of the magnetic fluctuations of 3{ital d} Cu moments in Cu{sub 0.96}Zn{sub 0.04}GeO{sub 3} is estimated to be {tau}{sub {ital c}}{approx}10{sup {minus}8} s at 5 K.

Authors:
; ;  [1]
  1. Institut de Ciencia de Materials de Barcelona, Consejo Superior de Investigaciones Cientificas, Campus Universidad Autonoma, ES-08193 Bellaterra (Spain)
Publication Date:
OSTI Identifier:
90498
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 52; Journal Issue: 6; Other Information: PBD: 1 Aug 1995
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; GERMANATES; SPIN GLASS STATE; MUON SPIN RELAXATION; CUPRATES; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0000-0013 K; TEMPERATURE RANGE 0013-0065 K; SPIN ORIENTATION; ZINC ADDITIONS; FLUCTUATIONS; HYSTERESIS; MAGNETIC SUSCEPTIBILITY; TEMPERATURE RANGE 0273-0400 K; TEMPERATURE RANGE 0065-0273 K; CRITICAL TEMPERATURE; SUBSTOICHIOMETRY

Citation Formats

Garcia-Munoz, J L, Suaaidi, M, and Martinez, B. Spin dynamics in pure and Zn-doped CuGeO{sub 3} by muon spin relaxation: Spin-Peierls and spin-glass transitions. United States: N. p., 1995. Web. doi:10.1103/PhysRevB.52.4288.
Garcia-Munoz, J L, Suaaidi, M, & Martinez, B. Spin dynamics in pure and Zn-doped CuGeO{sub 3} by muon spin relaxation: Spin-Peierls and spin-glass transitions. United States. doi:10.1103/PhysRevB.52.4288.
Garcia-Munoz, J L, Suaaidi, M, and Martinez, B. Tue . "Spin dynamics in pure and Zn-doped CuGeO{sub 3} by muon spin relaxation: Spin-Peierls and spin-glass transitions". United States. doi:10.1103/PhysRevB.52.4288.
@article{osti_90498,
title = {Spin dynamics in pure and Zn-doped CuGeO{sub 3} by muon spin relaxation: Spin-Peierls and spin-glass transitions},
author = {Garcia-Munoz, J L and Suaaidi, M and Martinez, B},
abstractNote = {Zero and longitudinal muon spin relaxation has been used to characterize the spin dynamics of local magnetic moments in the quasi-one-dimensional {ital S}=1/2 cuprates CuGeO{sub 3} and Cu{sub 0.96}Zn{sub 0.04}GeO{sub 3}. Frozen moments are not observed in CuGeO{sub 3}, only a slowing down of the fluctuating rate of Cu moments was seen below 14 K. Magnetic measurements in the slightly doped sample confirm the suppression of the spin-singlet transition, and the appearance of hysteresis between the zero-field-cooled and field-cooled branches of the magnetic susceptibility below {ital T}{approx}4.5 K, both absent in the pure compound. The depolarization of muons gives evidence of the appearance of randomly frozen Cu moments in the doped compound below {ital T}{sub {ital g}}{approx}4.5 K. The dynamic relaxation rate {lambda}{sub {ital d}} is appreciably higher around {ital T}{sub {ital g}} than below 4 K, and the correlation time {tau}{sub {ital c}} of the magnetic fluctuations of 3{ital d} Cu moments in Cu{sub 0.96}Zn{sub 0.04}GeO{sub 3} is estimated to be {tau}{sub {ital c}}{approx}10{sup {minus}8} s at 5 K.},
doi = {10.1103/PhysRevB.52.4288},
journal = {Physical Review, B: Condensed Matter},
number = 6,
volume = 52,
place = {United States},
year = {1995},
month = {8}
}