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Thermodynamic properties of the spin-Peierls transition in CuGeO3 (1995)

Weiden, M. ; Köhler, J. ; Sparn, G. ; [et al.]

Springer

The European physical journal 98 (1995), S. 167-169

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ISSN: 1434-6036

Keywords: 65.50 + m ; 75.10.Jm ; 75.50.Ee

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract We present an investigation of the spin-Peierls transition atT SP=14.5 K in polycrystalline CuGeO3 through specific-heat and thermal-expansion measurements. Clear second-order phase-transition anomalies are found in both properties atT SP, although only a small entropy of S≈0.1 Rℓn2 is released at the transition. Most of the entropy is released atT SP〈T〈150 K, where the temperature dependence of the magnetic contribution to the specific heat as well as the thermal expansion exhibit extrema atT *≈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 (∂T SP/∂p)p→0 ≈ (0.45±0.06) K/kbar is derived.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01324522

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Experimentelle Untersuchung des statistischen Größeneinflusses im Dauerschwingversuch an ungekerbten Stahlproben (1975)

Heckel, K. ; Köhler, J. ; München, Tu

Weinheim : Wiley-Blackwell

Materialwissenschaft und Werkstofftechnik 6 (1975), S. 52-54

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ISSN: 0933-5137

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Description / Table of Contents: Experimental Investigation of the Statistical Size-Effect in Fatigue Tests with Unnotched Specimens.In constant-load-fatigue-tests with unnotched specimens of different lengths, the statistical effect of specimen's size in probability of lifetime to fracture was determined.

Notes: Im einstufigen Dauerschwingversuch an ungekerbten Proben mit unterschiedlichen Meßlängen konnte der statistische Einfluß der Probengröße auf deren Bruchwahrscheinlichkeit experimentell nachgewiesen werden.

Additional Material: 3 Ill.