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Author  |
Sereni, J.G.; Schmerber, G.; Berisso, M.G.; Chevalier, B.; Kappler, J.P. |
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Title |
Tricritical point and suppression of the Shastry-Sutherland phase in Ce2(Pd1−xNix)2Sn |
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Journal Article |
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Year |
2012 |
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Physical Review B – Condensed Matter and Materials Physics |
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Phys. Rev. B |
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85 |
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13 |
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134404 |
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Abstract |
Structural, magnetization, and heat capacity measurements were performed on Ce2(Pd1−xNix)2Sn compounds covering the full range of the Mo2FeB2 structure stability (0⩽x⩽0.25). In this system, the two transitions observed in Ce2Pd2Sn (antiferromagnetic TN=4.8 K and ferromagnetic TC=2.1 K) converge into a tricritical point at Tcr≈3.4 K for xcr≈0.3, where the intermediate antiferromagnetic (AF) phase is suppressed. The decrease of the TN(x) phase boundary is due to an incipient Kondo screening of the Ce-4f moments. This effect and the increase of local atomic disorder affect the formation of Ce-magnetic dimers on which the Shastry-Sutherland lattice (SSL) builds up. On the contrary, the TC(x) transition to the ferromagnetic ground state increases as a consequence of the weakening of the intermediate phase. Applied magnetic fields also suppress the AF-SSL phase as it was already observed in the stoichiometric compound. |
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American Physical Society |
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Call Number |
BT @ berisso @ 10.1103/PhysRevB.85.134404 |
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639 |
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