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Physica B Condensed Matter

Quantum phase transitions in frustrated ferro- and ferrimagnets

Johannes Richter, Ulrich Schollwöck, Nedko B. Ivanov

Published Jun 1, 2000• 5 citations
Publisher
DOI
10.1016/s0921-4526(99)00783-8

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Significant decrease of spontaneous magnetization in frustrated one-dimensional ferro- and ferrimagnets due to nonmagnetic impurities is predicted. Using the density-matrix renormalization group method and the exact diagonalization method, we confirm that the total spin can vanish due to a single impurity in finite chains. Introducing the picture of magnetic domain inversion, we numerically investigate the impurity-density dependence of magnetization. In particular, we show that even with an infinitesimal density of impurities, the magnetization in the ground state is reduced by about 40% from that of the corresponding pure system. Conditions for the materials which may show this anomalous impurity effect are formulated.