Charge Modulation in La1.67Sr0.33NiO4: A Bulk Thermodynamic Study

A. P. Ramirez, P. L. Gammel, S. W. Cheong, D. J. Bishop, P. Chandra

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Abstract

We present ultrasonic (ν) and specific heat (cp) measurements performed on La1.67Sr0.33NiO4 to confirm and characterize the nature of the thermodynamic transition observed at Tc = 240K in this material. The behavior of ν(T ∼ Tc) suggests that this transition is not due to the long-range ordering of the uncompensated nickel spins. The possibility of independent hole-spin behavior is consistent with the observed entropy and measured anomalies in the resistivity, susceptibility, and ultrasound. A comparison of ν(T) and cp(T) suggests that the sound couples primarily to the order parameter energy.

Original languageEnglish (US)
Pages (from-to)447-450
Number of pages4
JournalPhysical review letters
Volume76
Issue number3
DOIs
StatePublished - 1996
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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