TY - JOUR
T1 - Magnetic neutron diffraction under pressures up to 43 GPa. Study of the EuX and GdX compounds
AU - Goncharenko, I. N.
AU - Mirebeau, I.
AU - Ochiai, A.
N1 - Funding Information:
We thank P. Böni (PSI, Willengen) for providing the Ni–Ti supermirrors for the focusing systems. We thank A. Gabriel for the developments of the new delay-line multidetector. We acknowledge the help of P. Molina (LLB, now Ecole Centrale de Nantes) in the construction of the focusing systems and of other equipment used in high pressure neutron studies. We thank I.V. Naumov (RRC Kurchatov Institute) for his work on construction of the high pressure cells. We appreciate the help of A.V. Irodova in the characterization of the Eu-chalcogenides at ambient pressure. We acknowledge the contribution of J.-M. Mignot to the development of the high pressure project. The project was actively supported by the directors of the LLB (Ch. De Novion) and Kurchatov Institute (A.Yu. Rumyantsev). The work was supported in part by the Russian Foundation for Basic Research Grant No. 97-02-17672 and No. 00-15-96712.
PY - 2000
Y1 - 2000
N2 - We present some recent results on magnetic neutron studies at pressures above 40 GPa. We used diamond and sapphire anvil pressure cells for low temperature neutron studies and a powder diffractometer specialized for high pressure studies. Focusing systems and low background conditions allowed us to study samples with volumes as small as 0.001 mm3 in a diamond anvil cell at a pressure of 50 GPa. This technical progress allowed us to obtain new results in studies of "textbook" magnetic insulators EuX (X = S, Se, Te) and GdX (X = As, Sb, Bi). We found new magnetic phases. In the Eu-chalcogenides we observed a strong anion-dependent increase of the ferromagnetic exchange with decreasing lattice constant. In contrast, in the GdX compounds the antiferromagnetic order remains stable up to a pressure of 43 GPa. We show the importance of our results to understand the origin of indirect exchange interactions in magnetic semiconductors with well localized magnetic shells.
AB - We present some recent results on magnetic neutron studies at pressures above 40 GPa. We used diamond and sapphire anvil pressure cells for low temperature neutron studies and a powder diffractometer specialized for high pressure studies. Focusing systems and low background conditions allowed us to study samples with volumes as small as 0.001 mm3 in a diamond anvil cell at a pressure of 50 GPa. This technical progress allowed us to obtain new results in studies of "textbook" magnetic insulators EuX (X = S, Se, Te) and GdX (X = As, Sb, Bi). We found new magnetic phases. In the Eu-chalcogenides we observed a strong anion-dependent increase of the ferromagnetic exchange with decreasing lattice constant. In contrast, in the GdX compounds the antiferromagnetic order remains stable up to a pressure of 43 GPa. We show the importance of our results to understand the origin of indirect exchange interactions in magnetic semiconductors with well localized magnetic shells.
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U2 - 10.1023/A:1012639817199
DO - 10.1023/A:1012639817199
M3 - Article
AN - SCOPUS:0034453070
SN - 0304-3843
VL - 128
SP - 225
EP - 244
JO - Hyperfine Interaction
JF - Hyperfine Interaction
IS - 1-3
ER -