Field and Impurity Induced Ordering in Interacting Dimer Systems(Impurity and Pressure Effects, Field-Induced Phase Transitions and Dynamics in Quantum Spin Systems)

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概要

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• We study the interplay of doping and an external magnetic field H on dimerized antiferromagnetic S=1/2 systems with a finite spin gap Δ. We show that for sufficiently small three-dimensional coupling J' the long-range antiferromagnetic order known to result from doping with nonmagnetic impurities is destroyed by a weak magnetic field H>H_<c1>. The lower critical field H_<c1> is proportional to the impurity concentration, above H_<c1> the system remains in the disordered (plateau) phase up to the much higher upper critical field H_<c2>≃Δ. We discuss the phase diagram in the (H, J') and (H, T) planes and suggest that the reentrant behavior can be experimentally observed in KCuCl_3. It is argued that similar phenomena can arise in other weakly coupled quasi-one-dimensional gapped systems.

• 理論物理学刊行会の論文
• 2005-10-31

著者

• Mikeska Hans

  Institut Fur Theoretische Physik Universitat Hannover

• Mikeska Hans-jurgen

  Institut Fur Theoretische Physik Universitat Hannover

• KOLEZHUK Alexei

  Institut fur Theoretische Physik, Universitat Hannover

• Kolezhuk Alexei

  Institut Fur Theoretische Physik Universitat Hannover

• MIKESKA Hans

  Institut fur Theoretische Physik, Universitat Hannover

関連論文

• Ground-State Phase Diagram of the Spin-1/2-1/2-1-1 Chain : Condensed Matter: Electronic Properties, etc.
• Field and Impurity Induced Ordering in Interacting Dimer Systems(Impurity and Pressure Effects, Field-Induced Phase Transitions and Dynamics in Quantum Spin Systems)
• Response Functions of Gapped Spin Systems in High Magnetic Field
• Large-S Approach to Chiral Phases in Frustrated Spin Chains

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