Low Temperature Specific Heat of (La1-xSrx)2NiO4+δ

Masatsune Kato, Yoshiteru Maeno, Toshizo Fujita

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10 Citations (Scopus)


We studied the low temperature specific heat C of nonsuperconducting oxides (La1_xSrx)2NiO4+δ in a wide range of x up to 0.65, along with the lattice parameters at room temperature, electrical resistivity ρ and magnetic susceptibility χ. We observed the qualitative change in both ρ and χ at x=0.20 ∼ 0.25 corresponding to that in c/a, which is ascribed to the transition from the high-spin to low-spin state of Ni ions. The anomalous hump in C below 10 K was observed. It disappears gradually above x∼0.20 and coincides with the transition of the spin states. However, this hump is well described by a modified Schottky-type contribution and possibly originates from the presence of the two-level system due to a glassy magnetic state.

Original languageEnglish
Pages (from-to)1994-2001
Number of pages8
JournalJournal of the Physical Society of Japan
Issue number6
Publication statusPublished - 1991 Jan


  • glassy magnetic state
  • low temperature specific heat
  • nonsuperconducting Ni oxides
  • transition from the high-spin to low-spin state


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