Наведено основні законодавчі акти з регулювання освітніх відносин,
зокрема, у сфері вищої, загальної середньої, професійно-технічної,
позашкільної освіти тощо.
Розраховано на студентів, які здобувають повну вищу освіту за
спеціальностями "Правознавство", "Педагогіка вищої школи", науково-
педагогічних і педагогічних працівників

H. Capellmann

K-U. Neumann

K. R.A. Ziebeck

R. K. Kremer

T. J. Smith

The European Physical Journal B

Ukrainian

A polarised neutron scattering investigation has been carried out on a powder sample 
of CuGeO3 within the temperature range of 1.5 K to 600 K. The magnetic scattering 
has been separated from all other contributions by using polarised neutrons and 
polarisation analysis and placed onto an absolute scale. At low temperatures the long 
wavelength components of the paramagnetic response are suppressed consistent 
with the formation of Cu dimers in which the magnetic moments are correlated 
antiferromagnetically. This form of the scattering persists to temperatures well above 
the dimerisation temperature $T_{\rm sp} \sim14$ K. However as the temperature is raised the 
intensity of the long wavelength spin fluctuations increases and above ~150 K they 
are the dominant feature in the wave vector dependence of the response. At all 
temperatures the observed scattering extrapolates smoothly to the Q=0 value given 
by the uniform susceptibility. Consequently the thermal variation of the uniform 
susceptibility arises from the evolution of the long wavelength magnetic fluctuations. 
At large wave vectors the energy dependence of the scattering revealed that the 
response occurs below 16 meV in agreement with the reported maximum magnetic 
excitation energy at the zone boundary in the ground state. However the total 
magnetic scattering is significantly less than that expected for a local moment system 
suggesting that the spectrum of thermal and quantum fluctuations overlap

EDP Sciences OAI-PMH repository (1.2.0)

A quantitative determination of magnetic fluctuations in CuGeO

Кірін, Р. С.

Кострюков, С. В.

Андрєєва, Д. Є.

eLibrary National Mining University

Освітнє законодавство. Основні законодавчі акти

A polarised neutron scattering investigation has been carried out on a powder sample of CuGeO3
within the temperature range of 1.5 K to 600 K. The magnetic scattering has been separated from all other
contributions by using polarised neutrons and polarisation analysis and placed onto an absolute scale. At
low temperatures the long wavelength components of the paramagnetic response are suppressed consistent
with the formation of Cu dimers in which the magnetic moments are correlated antiferromagnetically.
This form of the scattering persists to temperatures well above the dimerisation temperature Tsp   14 K.
However as the temperature is raised the intensity of the long wavelength spin fluctuations increases
and above  150 K they are the dominant feature in the wave vector dependence of the response. At all
temperatures the observed scattering extrapolates smoothly to the Q = 0 value given by the uniform
susceptibility. Consequently the thermal variation of the uniform susceptibility arises from the evolution of
the long wavelength magnetic fluctuations. At large wave vectors the energy dependence of the scattering
revealed that the response occurs below 16 meV in agreement with the reported maximum magnetic
excitation energy at the zone boundary in the ground state. However the total magnetic scattering is
signi cantly less than that expected for a local moment system suggesting that the spectrum of thermal
and quantum fluctuations overlap

T.J. Smith (7173203)

H. Capellmann (7173206)

R.K. Kremer (7173209)

Klaus-Ulrich Neumann (7165319)

K.R.A. Ziebeck (7173212)

Loughborough University Institutional Repository

A quantitative determination of magnetic fluctuations in CuGeO3

Smith, T. J.

Capellmann, Herbert

Kremer, R. K.

Neumann, K. U.

Ziebeck, K. R.

RWTH Publications

Publikationsserver der RWTH Aachen University

http://ir.nmu.org.ua//bitstream/123456789/3488/1/CD255.pdf

Освітнє законодавство. Основні законодавчі акти

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EDP Sciences OAI-PMH repository (1.2.0)

eLibrary National Mining University

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