Impurity effects on a 2-leg spin ladder compound SrCu2O3

M. Takano, M. Azuma, Y. Fujishiro, Minoru Nohara, H. Takagi, M. Fujiwara, H. Yasuoka, S. Ohsugi, Y. Kitaoka, R. S. Eccleston

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Abstract

Measurements of magnetic susceptibility, specific heat and inelastic neutron scattering were performed on a Zn-substituted spin-1/2 Heisenberg 2-leg ladder compound Sr(Cu1-xZnx)2O3 (x ≤ 0.08) to investigate nonmagnetic impurity effects on the quantum spin system with a large spin gap of about ∼ 400 K. A clear anomaly attributed to the onset of antiferromagnetic ordering was observed both in the magnetic susceptibility and specific heat data even at only 1 % of Zn. The Néel temperature showed a systematic Zn-concentration dependence with a broad maximum at around 4 % substitution (TNmax ∼ 8K). A finite amount of T-linear term with a coefficient of γ ∼ 3.5 mJ/K2 was observed in the specific heat above TN for x = 0.02 and 0.04, suggesting the existence of a finite density of states at E = 0 in the spin excitation spectrum as supported by the inelastic neutron scattering measurement.

Original languageEnglish
Pages (from-to)149-152
Number of pages4
JournalPhysica C: Superconductivity and its Applications
Volume282-287
Issue numberPART 1
Publication statusPublished - Aug 1997
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Takano, M., Azuma, M., Fujishiro, Y., Nohara, M., Takagi, H., Fujiwara, M., Yasuoka, H., Ohsugi, S., Kitaoka, Y., & Eccleston, R. S. (1997). Impurity effects on a 2-leg spin ladder compound SrCu2O3. Physica C: Superconductivity and its Applications, 282-287(PART 1), 149-152.