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Weak ferromagnetism in κ-(ET)2Cu[N(CN)2]Cl

✍ Scribed by U. Welp; S. Fleshler; W.K. Kwok; G.W. Crabtree; K.D. Carlson; H.H. Wang; U. Geiser; J.M. Williams; V.M. Hitsman

Book ID
103939033
Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
214 KB
Volume
186-188
Category
Article
ISSN
0921-4526

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✦ Synopsis

We present magnetization measurements at ambient pressure on K-(ET)2Cu[N(CN)2]CI, an organic salt that is superconducting under pressure (T c = 12.8 K at 0.3 kbar). An antiferromagnetic transition near 45 K and, for the first time in this class of materials, a transition near 22 K to a state displaying weak ferromagnetic hysteresis with a saturation moment of 8 x 10-4/~/formula are observed. This low-temperature state is characterized by a sequence of first-order magnetization jumps.

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A reversible symmetry-lowering structural phase transition is observed by X-ray diffraction techniques from single crystals of I¢-(ET)2Cu[N(CN)2]C1 (ET, or BEDT-TTF, is bis(ethylenedithio)tetrathiafulvalene, C~oHsSs) under applied pressure. At room temperature, by use of a diamond anvil cell, a tran