TY - JOUR

T1 - Thermodynamic property of the Δ-chain

AU - Nakamura, Tota

AU - Saika, Yohei

PY - 1995/3

Y1 - 1995/3

N2 - A one-dimensional fully frustrated quantum spin system called the Δ-chain is investigated, particularly with respect to the low-temperature structure of the specific heat, by quantum Monte Carlo simulations using the restructuring method. Sizes of the systems we considered are N=32, 48 and 64. The simulation results together with the diagonalization results for N=10 and 16 show that the size dependence of the data is very weak, and thus the second peak of the specific heat stably exists at T<0.1, which corresponds to less than half the spin gap. Locality of excitations is seen in the Monte Carlo snapshot. We consider that the low-temperature properties of this system are governed by the local elementary excitations which generate the Schottky-type specific heat peak in the background of the ordinary thermal specific heat.

AB - A one-dimensional fully frustrated quantum spin system called the Δ-chain is investigated, particularly with respect to the low-temperature structure of the specific heat, by quantum Monte Carlo simulations using the restructuring method. Sizes of the systems we considered are N=32, 48 and 64. The simulation results together with the diagonalization results for N=10 and 16 show that the size dependence of the data is very weak, and thus the second peak of the specific heat stably exists at T<0.1, which corresponds to less than half the spin gap. Locality of excitations is seen in the Monte Carlo snapshot. We consider that the low-temperature properties of this system are governed by the local elementary excitations which generate the Schottky-type specific heat peak in the background of the ordinary thermal specific heat.

KW - Double peak of specific heat

KW - Frustrated quantum spin system

KW - Quantum Monte Carlo method

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U2 - 10.1143/JPSJ.64.695

DO - 10.1143/JPSJ.64.695

M3 - Article

AN - SCOPUS:21844488892

SN - 0031-9015

VL - 64

SP - 695

EP - 698

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

IS - 3

ER -