Long-distance super-exchange and quantum magnetic relaxation in a hybrid metal-organic framework

doi:10.1088/1674-1056/25/1/017601

Abstract

The hybrid metal-organic framework [(CH₃)₂NH₂]Fe(HCOO)₃ with a perovskite-like structure exhibits a variety of unusual magnetic behaviors at low temperatures. While the long-distance super-exchange through the Fe-O-CH-O-Fe exchange path leads to a canted antiferromagnetic ordering at T_N ～ 19 K, a second transition of magnetic blocking develops at T_B ～ 9 K. The stair-shaped magnetization hysteresis loops below T_B resemble the behaviors of resonant quantum tunneling of magnetization in single-molecular quantum magnets. Moreover, the magnetic relaxation also exhibits several features of resonant quantum relaxation, such as the exponential law with a single characteristic relaxation time, and the nonmonotonic dependence of relaxation rate on the applied magnetic field with a much faster relaxation around the resonant fields. The origin of quantum tunneling behaviors in the [(CH₃)₂NH₂]Fe(HCOO)₃ metal-organic framework is discussed in terms of magnetic phase separation due to the modification of hydrogen bonding on the long-distance super-exchange interaction.

Keywords: metal-organic frameworks resonant quantum relaxation long-distance super-exchange interaction hydrogen bonds

Received: 27 August 2015
Revised: 19 October 2015
Accepted manuscript online:

PACS:	76.20.+q	(General theory of resonances and relaxations)
	75.30.Et	(Exchange and superexchange interactions)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 11227405, 51371192, and 51371193) and the Chinese Academy of Sciences (Grant No. XDB07030200).

Corresponding Authors: Young Sun
E-mail: youngsun@iphy.ac.cn

Cite this article:

Ying Tian(田英), Shipeng Shen(申世鹏), Junzhuang Cong(丛君状), Liqin Yan(闫丽琴), Yisheng Chai(柴一晟), Young Sun(孙阳) Long-distance super-exchange and quantum magnetic relaxation in a hybrid metal-organic framework 2016 Chin. Phys. B 25 017601

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Long-distance super-exchange and quantum magnetic relaxation in a hybrid metal-organic framework

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