量子隧道
凝聚态物理
磁化
物理
放松(心理学)
自旋(空气动力学)
磁场
领域(数学)
磁滞
分子磁体
磁强计
量子
材料科学
量子力学
热力学
纯数学
社会心理学
数学
心理学
作者
Jonathan R. Friedman,M. P. Sarachik,J. Tejada,Ronald F. Ziolo
标识
DOI:10.1103/physrevlett.76.3830
摘要
We report the observation of steps at regular intervals of magnetic field in the hysteresis loop of a macroscopic sample of oriented M${\mathrm{n}}_{12}$${\mathrm{O}}_{12}$(C${\mathrm{H}}_{3}$COO${)}_{16}$(${\mathrm{H}}_{2}$O${)}_{4}$ crystals. The magnetic relaxation rate increases substantially when the field is tuned to a step. We propose that these effects are manifestations of thermally assisted, field-tuned resonant tunneling between quantum spin states, and attribute the observation of quantum-mechanical phenomena on a macroscopic scale to tunneling in a large (Avogadro's) number of magnetically identical molecules.
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