English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The results of high-frequency (60–315 GHz) electron spin resonance (ESR) studies of CuGeO3 single crystals containing 0.9% Mn impurity are reported. The quantitative ESR line shape analysis shows that the low-temperature (T < 40 K) magnetic susceptibility of Cu2+ chains diverges as χ ∼ 1/T  α  with the critical exponent α = 0.81±0.03 and therefore indicates the onset of a quantum critical (QC) regime. A scenario in which the disorder caused by the Mn impurity in quantum spin chains of CuGeO3 may lead to the coexistence of the quantum critical regime and the spin-Peierls dimerization is discussed. For the quantitative description of the temperature dependences of the line width and g-factor, a model assuming a crossover from the high-temperature semiclassical Nagata and Tazuke limit to the low-temperature quantum case described by Oshikawa and Affleck’s theory is suggested.

ESR probing of quantum critical phenomena in doped S = 1/2 AF quantum spin chain