検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年

Tomonaga-Luttinger liquid in a quasi-one-dimensional $$S$$ = 1 antiferromagnet observed by specific heat measurements

比熱測定による$$S$$=1の準一次元反強磁性鎖における朝永・ラッティンジャー流体的振る舞い

萩原 政幸*; 辻井 宏之*; Rotundu, C. R.*; Andraka, B.*; 高野 安正*; 立岩 尚之; 小林 達生*; 鈴木 隆史*; 菅 誠一郎*

Hagiwara, Masayuki*; Tsujii, Hiroyuki*; Rotundu, C. R.*; Andraka, B.*; Takano, Yasumasa*; Tateiwa, Naoyuki; Kobayashi, Tatsuo*; Suzuki, Takafumi*; Suga, Seiichiro*

準一次元系磁性物質Ni(C$$_9$$H$$_{24}$$N$$_4$$)(NO$$_2$$)(ClO$$_4$$)(NTENP)の磁場中比熱測定を行った。スピン鎖に並行に磁場を加えると、臨界磁場$$H_c$$以上でスピンギャップが消滅し、磁気秩序転移温度より高温では比熱$$C_{rm mag}$$が温度$$T$$に依存する振る舞いを示すことが明らかとなった。本研究から明らかとなった、朝永-ラッティンジャー流体的振る舞いについて理論モデルを用いて解析する。

Specific-heat experiments on single crystals of the $$S$$ = 1 quasi-one-dimensional bond-alternating antiferromagnet Ni(C$$_9$$H$$_{24}$$N$$_4$$)(NO$$_2$$)(ClO$$_4$$) (NTENP) have been performed in magnetic fields applied both parallel and perpendicular to the spin chains. We have found for the parallel field configuration that the magnetic specific heat ($$C_{rm mag}$$) is proportional to temperature ($$T$$) above a critical field $$H_c$$, at which the energy gap vanishes, in a temperature region above that of the long-range ordered state. The ratio $$C_{rm mag}$$ = $$T$$ increases as the magnetic field approaches $$H_c$$ from above. The data are in good quantitative agreement with the prediction of the $$c$$=1 conformal field theory in conjunction with the velocity of the excitations calculated by a numerical diagonalization, providing conclusive evidence for a Tomonaga-Luttinger liquid.

Access

:

- Accesses

InCites™

:

パーセンタイル:32.71

分野:Physics, Multidisciplinary

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.