de.mpg.escidoc.pubman.appbase.FacesBean
English
 
Help Guide Disclaimer Contact us Login
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Thermodynamic properties of the spin-Peierls transition in CuGeO3

MPS-Authors
There are no MPG-Authors available
Locator
There are no locators available
Fulltext (public)
There are no public fulltexts available
Supplementary Material (public)
There is no public supplementary material available
Citation

Weiden, M., Köhler, J., Sparn, G., Köppen, M., Lang, M., Geibel, C., et al. (1995). Thermodynamic properties of the spin-Peierls transition in CuGeO3. Zeitschrift für Physik B, 98(2), 167-169. doi:10.1007/BF01324522.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-E574-B
Abstract
We present an investigation of the spin-Peierls transition at T(sp) = 14.5 K in polycrystalline CuGeO(3) through specific-heat and thermal-expansion measurements. Clear second-order phase-transition anomalies are found in both properties at T(SP), although only a small entropy of S approximate to 0.1 Rln2 is released at the transition. Most of the entropy is released at T(SP) < T < 150 K, where the temperature dependence of the magnetic contribution to the specific heat as well as the thermal expansion exhibit extrema at T* approximate to 40 K. These are caused by one-dimensional antiferromagnetic fluctuations along the Cu chains, possibly accompanied by structural fluctuations. Using Ehrenfest's relation, a hydrostatic pressure coefficient (partial derivative T(SP)/partial derivative)(p))(p) --> O approximate to (0.45 +/- 0.06) K/kbar is derived.