Pressure evolution of the EFG and magnetic hyperfine field in the layered antiferromagnet FeI2 |
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Authors: | G R Hearne M P Pasternak R D Taylor |
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Institution: | (1) School of Physics and Astronomy, Tel-Aviv University, Ramat-Aviv, 69978 Tel-Aviv, Israel;(2) Physics Division, Los Alamos National Laboratory, 87545 New Mexico, USA |
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Abstract: | When FeI2 is subjected to pressures of up to 20 GPa, a change of approximately 20% occurs in the unit cell volume.57Fe Mössbauer spectroscopy (MS) in a diamondanvil cell has been used to monitor the pressure evolution of the hyperfine interaction parameters of this layered antiferromagnetic insulator. The pressure dependence of the quadrupole splittingQS at 296 K exhibits a maximum at 12 GPa and the saturation magnetic hyperfine fieldH
0 increases from 7.4 T at ambient pressure to 12 T at 18 GPa. A qualitative analysis identifies the pressure evolution ofQS with changes in the trigonal component of the crystal field splitting. The pressure variation ofH
0 is attributed to an increase in the average value of the 3d charge density distribution. |
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