Field tuning of thermally activated magnetic quantum tunnelling in Mn-12-Ac molecules

被引：265

作者：

Hernandez, JM

Zhang, XX

Luis, F

Bartolome, J

Tejada, J

Ziolo, R

机构：

[1] UNIV ZARAGOZA,CSIC,INST CIENCIA MAT ARAGON,E-50009 ZARAGOZA,SPAIN

[2] XEROX CORP,WILSON CTR RES & TECHNOL,WEBSTER,NY 14580

来源：

EUROPHYSICS LETTERS | 1996年 / 35卷 / 04期

关键词：

D O I：

10.1209/epl/i1996-00570-7

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Zero-field-cooled magnetization, magnetic relaxation, and a.c. susceptibility measurements have been performed on a Mn-12-Ac oriented powdered sample as a function of temperature, field, and orientation. Magnetization jumps and susceptibility peaks have been observed about magnetic-field values B-n = nB(1), where B-1 approximate to 5 kG. These anomalies are due to the existence of relaxation rate maxima near B-n. From these experimental results we infer the existence of resonant spin tunnelling between degenerate excited levels of opposite spin orientation.

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页码：301 / 306

页数：6

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