Peculiarities of electronic heat capacity of thulium cuprates in pseudogap state

Details Peculiarities of electronic heat capacity of thulium cuprates in pseudogap state Peculiarities of electronic heat capacity of thulium cuprates in pseudogap state

2002-03-12

arxiv.org/abs/cond-mat/0203243v1

Physics

Condensed Matter

Superconductivity

12 pages, 3 Postscript figures

Scientific paper

10.1063/1.1511712

Precise calorimetric measurements have been carried out in the 7 - 300 K temperature range on two ceramic samples of thulium 123 cuprates TmBa2Cu3O6.92 and TmBa2Cu3O6.70. The temperature dependence of the heat capacity was analyzed in the region where the pseudogap state (PGS) takes place. The lattice contribution was subtracted from the experimental data. The PGS component has been obtained by comparing electronic heat capacities of two investigated samples because the PGS contribution for the 6.92 sample is negligible. The anomalous behavior of the electronic heat capacity near the temperature boundary of PGS was found. It is supposed that this anomaly is due to peculiarities in N(E) function where N is the density of electronic states and E is the energy of carriers of charge.

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