||Direct three-dimensional ordering of quasi-one-dimensional quantum dimer system near critical fields
Matsushita, Taku ,
Hori, Nobuyoshi ,
Takata, Seiya ,
Wada, Nobuo ,
Amaya, NaokiHosokoshi, Yuko
020408R , 2017-01-12 , American Physical Society
Dimensionalities of XXZ spin orderings or degenerate hard-core bosons in a quasi-one-dimensional (1D) dimer system are examined by the ac susceptibility and specific heat of antiferromagnetic bond-alternating chains in pentafluorophenyl nitronyl nitroxide (F5PNN). At intermediate fields in the gapless region, the 1D short-range order (SRO) corresponding to the Tomonaga-Luttinger liquid and three-dimensional (3D) long-range order (LRO BEC) at lower temperatures are separately observed, as expected from the small interchain interaction. In contrast, a definite region around the critical field was established where 3D LRO occurs without the development of 1D SRO at higher temperatures.