Search for magnetic order in undoped and doped spin-gap systems by μSR

K. Kojima, A. Keren, L. P. Le, M. Larkin, G. M. Luke, B. Nachumi, W. D. Wu, Y. J. Uemura, M. Azuma, M. Takano, K. Kiyono, S. Miyasaka, N. Motoyama, H. Takagi, S. Uchida, M. Hase, Y. Sasago, K. Uchinokura, M. Matsuda, K. KatsumataA. Revcolevschi, R. Cava

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Abstract

We introduce our μSR investigations of spin-gap systems, such as, (1) a 2-leg spin-ladder material SrCu2O3, (2) a Haldane material (S = 1 spin-chain) Y2BaNiO5, (3) a spin-Peierls material CuGeO3, (4) a spin-chain&ladder material Sr6Ca8Cu24O41. All of these antiferromagnetic spin systems are characterized by a spin-gap between the singlet groundstate and the triplet first excited states. In the above-mentioned materials, we confirmed the absence of magnetic order down to milli-Kelvin regime, supporting the non-magnetic feature of the ground-state. If a spin-gap system is doped with charges and/or vacancies at the spin site, unpaired spins are induced out of the singlet ground-state. In some materials, doping completely destroys the singlet ground-state and induces a bulk magnetic order. We report μSR investigations of doped materials as well, which clarifies the existence/absence of a magnetic order upon doping.

Original languageEnglish (US)
Pages (from-to)37-42
Number of pages6
JournalHyperfine Interactions
Volume104
Issue number1-4
StatePublished - 1997

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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    Kojima, K., Keren, A., Le, L. P., Larkin, M., Luke, G. M., Nachumi, B., Wu, W. D., Uemura, Y. J., Azuma, M., Takano, M., Kiyono, K., Miyasaka, S., Motoyama, N., Takagi, H., Uchida, S., Hase, M., Sasago, Y., Uchinokura, K., Matsuda, M., ... Cava, R. (1997). Search for magnetic order in undoped and doped spin-gap systems by μSR. Hyperfine Interactions, 104(1-4), 37-42.