Antiferromagnetic Ordering in the Spin Singlet State of the Ladder/Chain Material: Sr2.5Ca11.5Cu24O41

Takashi Nagata, Hirokazu Fujino, Jun Akimitsu, Masakazu Nishi, Kazuhisa Kakurai, Susumu Katano, Masahiko Hiroi, Masafumi Sera, Norio Kobayashi

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Abstract

We report on specific heat and neutron scattering measurements performed for Sri14-xCaxCu24O41 single crystals. The specific heat data of Sr2.5Ca11.5Cu24O41 showed a sharp phase transition at TN≈2.1K, indicating the possible onset of a long-range order. Specific heat measurements under magnetic fields also revealed that this phase transition is not due to charge ordering or structural phase transition but to magnetic ordering. In the neutron scattering experiments, we observed several Bragg peaks, corresponding to the magnetic ordering observed in the specific heat measurements. Furthermore, we confirmed from polarized neutron scattering measurements that these Bragg peaks are undoubtedly magnetic in origin. Considering both the nuclear magnetic resonance and neutron scattering data, a possible magnetic structure on the chain and ladder sites has been proposed. In this system, the singlet state and antiferromagnetic order induced by appropriate hole-doping coexist at ambient pressure and the dissolved hole pairs move under high pressure, leading to the occurrence of superconductivity.

Original languageEnglish
Pages (from-to)2206-2209
Number of pages4
JournalJournal of the Physical Society of Japan
Volume68
Issue number7
Publication statusPublished - Jul 1999
Externally publishedYes

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Keywords

  • Antiferromagnetic
  • Ladder
  • Spin-gap

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Nagata, T., Fujino, H., Akimitsu, J., Nishi, M., Kakurai, K., Katano, S., Hiroi, M., Sera, M., & Kobayashi, N. (1999). Antiferromagnetic Ordering in the Spin Singlet State of the Ladder/Chain Material: Sr2.5Ca11.5Cu24O41. Journal of the Physical Society of Japan, 68(7), 2206-2209.