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Field-induced quantum criticality and universal temperature dependence of the magnetization of a spin-1/2 heisenberg chain.
Kono, Y; Sakakibara, T; Aoyama, C P; Hotta, C; Turnbull, M M; Landee, C P; Takano, Y.
Afiliación
  • Kono Y; Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan.
  • Sakakibara T; Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan.
  • Aoyama CP; Department of Physics, University of Florida, Gainesville, Florida 32611-8440, USA.
  • Hotta C; Department of Basic Science, University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan.
  • Turnbull MM; Carlson School of Chemistry and Department of Physics, Clark University, Worcester, Massachusetts 01610-1477, USA.
  • Landee CP; Carlson School of Chemistry and Department of Physics, Clark University, Worcester, Massachusetts 01610-1477, USA.
  • Takano Y; Department of Physics, University of Florida, Gainesville, Florida 32611-8440, USA.
Phys Rev Lett ; 114(3): 037202, 2015 Jan 23.
Article en En | MEDLINE | ID: mdl-25659018
High-precision dc magnetization measurements have been made on Cu(C4H4N2) (NO3)2 in magnetic fields up to 14.7 T, slightly above the saturation field Hs=13.97 T, in the temperature range from 0.08 to 15 K. The magnetization curve and differential susceptibility at the lowest temperature show excellent agreement with exact theoretical results for the spin-1/2 Heisenberg antiferromagnet in one dimension. A broad peak is observed in magnetization measured as a function of temperature, signaling a crossover to a low-temperature Tomonaga-Luttinger-liquid regime. With an increasing field, the peak moves gradually to lower temperatures, compressing the regime, and, at Hs, the magnetization exhibits a strong upturn. This quantum critical behavior of the magnetization and that of the specific heat withstand quantitative tests against theory, demonstrating that the material is a practically perfect one-dimensional spin-1/2 Heisenberg antiferromagnet.
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Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2015 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Estados Unidos
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PubMed Links

Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2015 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Estados Unidos