High-field magnetization processes of quantum double spin chain systems KCuCl 3 , TlCuCl 3 and NH 4 CuCl 3

H. Tanaka, W. Shiramura, T. Takatsu, Budhy Kurniawan R., M. Takahashi, K. Kamishima, K. Takizawa, H. Mitamura, T. Goto

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20 Citations (Scopus)

Abstract

High-field magnetization processes of S = 1/2 double spin chain systems KCuCl 3 , TlCuCl 3 and NH 4 CuCl 3 have been measured up to 39 T at helium temperatures using single crystals. A transition from a singlet ground state with an excitation gap to a gapless magnetic state occurs at H c ∼ 20 and 6 T for KCuCl 3 and TlCuCl 3 , respectively. The excitation gap δ is evaluated as Δ/k B = 31.1 K for KCuCl 3 and 7.5 K for TlCuCl 3 . Although the antiferromagnetic interactions in TlCuCl 3 are stronger than those in KCuCl 3 , which can be seen from the slope of the magnetization curves above H c , the excitation gap in TlCuCl 3 is about a quarter of that of KCuCl 3 . In contrast to KCuCl 3 and TlCuCl 3 , NH 4 CuCl 3 has a gapless magnetic ground state. It is found that NH 4 CuCl 3 undergoes five phase transitions in high magnetic fields. Two wide plateaus are observed at a quarter and three quarters of the saturation magnetization.

Original languageEnglish
Pages (from-to)230-233
Number of pages4
JournalPhysica B: Condensed Matter
Volume246-247
DOIs
Publication statusPublished - 29 May 1998

Keywords

  • Double spin chain
  • Excitation gap
  • High field
  • KCuCl
  • Magnetization process
  • NH CuCl
  • Plateau
  • Quantized magnetization
  • Singlet ground state
  • TlCuCl

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