Results for low temperature specific heat for single crystals of ladder/chain materials Sr14-xCaxCu24O41 (x= 0, 8, 10, 11.5) in magnetic field up to ∼ 15 T are reported. A sharp peak of the specific heat of a single crystal Sr2.5Ca11.5Cu24O41, was found at ≃ 2.3 K, clearly indicating the onset of a long range order. In measurements of the specific heat in magnetic fields the transition temperature, TN, was found to shift to lower temperatures with increasing magnetic field, indicating that the ordering is antiferromagnetic, which has been confirmed by neutron scattering measurements. With decreasing x TN rapidly shifts to lower temperatures. For x=10 TN decreases to ≃ 1 K and for x= 0 no anomaly indicating the transition was found down to ∼ 0.6K.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Materials Science(all)
- Condensed Matter Physics