Published February 2000 | Version v1
Journal article Metadata-only

Electron paramagnetic resonance with geff ≅ 4.2 in YBa2Cu3O6.35. Model of chain copper-oxygen fragments

Creators

  • 1. Kazanskij Gosudarstvennyj Univ., Kazan' (Russian Federation)
  • 2. Kazanskij Fiziko-Tekhnicheskij Inst., Kazan' (Russian Federation)
  • 3. Experimentalphysik V, EKM, Inst. fuer Physik, Univ. Augsburg, Augsburg (Germany)
  • 4. Physik-Inst. der Univ. Zuerich, Zuerich (Switzerland)
  • 5. Lab. for Neutron Scattering, ETH Zuerich, Paul Sherrer Inst., Villigen (Switzerland)

Description

One carried out systematic measurements of EPR spectra with g ≅ 4.2 in YBa2Cu3O6+y compounds under y various doping indices. Temperature dependences of spectra intensity show that the ground states of the centres are singlet while Ms = ± 1 excited state energy values correspond to 8-11 K. In the general case the intensity of EPR spectra varies in time and depends on the production process of specimens. Chain fragments of variable valence copper ions are considered to be the most probable models of the studied paramagnetic centres. Paper describes the generalities of the energy structure of such centres

Abstract (Russian)

Проведены систематические измерения спектров ЭПР с g ≅ 4,2 в соединениях YBa2Cu3O6+y при различных индексах допирования y. Температурные зависимости интенсивности спектров показывают, что основные состояния центров синглетны, а энергии возбужденных состояний Ms = ± 1 соответствуют 8-11 К. В общем случае интенсивность спектров ЭПР меняется со временем и зависит от технологии приготовления образцов. Наиболее вероятными моделями исследованных парамагнитных центров считаются цепочечные фрагменты ионов меди переменной валентности. Описаны общие закономерности энергетической структуры таких центров

Additional details

Additional titles

Original title (Russian)
Электронный парамагнитный резонанс с г

Publishing Information

Journal Title
Zhurnal Ehksperimental'noj i Teoreticheskoj Fiziki
Journal Volume
117
Journal Issue
2
Journal Page Range
p. 411-419
ISSN
0044-4510
CODEN
ZETFA7

INIS

Country of Publication
Russian Federation
Country of Input or Organization
Russian Federation
INIS RN
33019075
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Descriptors DEI
BARIUM COMPOUNDS; CONCENTRATION RATIO; CUPRATES; ELECTRON SPIN RESONANCE; ENERGY LEVELS; EXCITED STATES; GYROMAGNETIC RATIO; HIGH-TC SUPERCONDUCTORS; HUBBARD MODEL; MAGNETIC FIELDS; PARAMAGNETISM; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0013-0065 K; YTTRIUM COMPOUNDS
Descriptors DEC
ALKALINE EARTH METAL COMPOUNDS; COPPER COMPOUNDS; CRYSTAL MODELS; ENERGY LEVELS; MAGNETIC RESONANCE; MAGNETISM; MATHEMATICAL MODELS; OXYGEN COMPOUNDS; RESONANCE; SUPERCONDUCTORS; TEMPERATURE RANGE; TRANSITION ELEMENT COMPOUNDS; TYPE-II SUPERCONDUCTORS

Optional Information

Notes
43 refs., 4 figs.