Novel Spin-Gap Behavior in Layered S=1/2 Quantum Spin System TiOCl
Imai, T. · Chou, F. C.
Original · EN
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 Tc1=94K and Tc2=66K into the singlet ground state with an unusually large energy gap Eg=430K. The broad distribution of the local electric field gradient in the intermediate phase between Tc1 and Tc2 suggests unconventional spin and lattice (probably orbital) states with an emerging spin-gap.
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