Finite-size effects on the static properties of a single-chain magnet

被引：75

作者：

Bogani, L

Sessoli, R

Pini, MG

Rettori, A

Novak, MA

Rosa, P

Massi, M

Fedi, ME

Giuntini, L

Caneschi, A

Gatteschi, D

机构：

[1] Univ Florence, Dipartimento Chim, I-50019 Sesto Fiorentino, Italy

[2] Univ Florence, INSTM, I-50019 Sesto Fiorentino, Italy

[3] CNR, Ist Sistemi Complessi, Sez Firenze, I-50019 Sesto Fiorentino, FI, Italy

[4] Univ Florence, Dipartimento Fis, I-50019 Sesto Fiorentino, Italy

[5] Univ Florence, Udr INFM, I-50019 Sesto Fiorentino, Italy

[6] Univ Fed Rio de Janeiro, Inst Fis, BR-21945970 Rio De Janeiro, Brazil

来源：

PHYSICAL REVIEW B | 2005年 / 72卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.72.064406

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the role of defects in the "single-chain magnet" CoPhOMe by inserting a controlled number of diamagnetic impurities. The samples are analyzed with unprecedented accuracy with the particle induced x-ray emission technique, and with ac and dc magnetic measurements. In an external applied field the system shows an unexpected behavior, giving rise to a double peak in the susceptibility. The static thermodynamic properties of the randomly diluted Ising chain with alternating g values are then exactly obtained via a transfer matrix approach. These results are compared to the experimental behavior of CoPhOMe, showing qualitative agreement.

引用

页数：10

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