Novel Spin-Gap Behavior in Layered S=1/2 Quantum Spin System TiOCl

T. Imai; F. C. Chou

Novel Spin-Gap Behavior in Layered S=1/2 Quantum Spin System TiOCl

Strongly Correlated Electrons 2007-05-23 v1

Authors: T. Imai , F. C. Chou

Abstract

We have investigated the spin fluctuations and their interplay with lattice instabilities in a layered S=1/2 quantum spin system TiOCl. Our Ti and Cl NMR data demonstrate a pseudo spin-gap behavior below T*=135 K, followed by successive phase transitions at T_c1=94K and T_c2=66K into the singlet ground state with an unusually large energy gap E_g=430K. The broad distribution of the local electric field gradient in the intermediate phase between T_c1 and T_c2 suggests unconventional spin and lattice (probably orbital) states with an emerging spin-gap.

Keywords

quantum spin liquids spin ladders spin excitations in condensed matter

Cite

@article{arxiv.cond-mat/0301425,
  title  = {Novel Spin-Gap Behavior in Layered S=1/2 Quantum Spin System TiOCl},
  author = {T. Imai and F. C. Chou},
  journal= {arXiv preprint arXiv:cond-mat/0301425},
  year   = {2007}
}

Comments

4 pages and 3 figures

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