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arXiv 1902.04540cond-mat.str-el
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磁阻挫Ce $_2$ Pd $_2$ Sn $_{1-y}$ In $_y$合金中电子浓度降低驱动的Shastry-Sutherland相抑制

Suppression of Shastry-Sutherland phase driven by electronic concentration reduction in magnetically frustrated Ce$_2$Pd$_2$Sn$_{1-y}$In$_y$ alloys

J. G. Sereni, J. Roberts, F. Gastaldo, M. Giovannini

摘要:

在具有Mo $_2$ B $_2$ Fe和U $_2$ Pt $_2$ Sn各向异性结构的稀土金属间化合物中,观察到Shastry-Sutherland晶格作为替代基态,其中磁阻挫是有利的。在Ce $_2$ Pd $_2$ Sn的情况下,它表明,这样的相可以被抑制的应用程序的磁场,并在这项工作中,其稳定性作为一个函数的电子浓度通过掺杂的Sn(4+)晶格与In(3+)原子进行了研究。磁性和比热测量表明,在50%左右的取代度下,Shastry Sutherland晶格在临界点处消失。该结果证实了该相对电子密度的强烈依赖性,因为最近对富Pd固溶体Ce $_{2+ε}$ Pd $_{2-ε}$ In $_{1-x}$ Sn $_x$(具有$ε< 0$)的研究表明,在中间Sn/In浓度下,原子无序支配相图,抑制磁阻挫效应。在这项工作中研究的合金中,$ε>0$字符稳定铁磁基态沿浓度,允许Shastry Sutherland晶格形成的Sn丰富的一面。

英文摘要:

Shastry-Sutherland lattice was observed as alternative ground state in Rare Earth intermetallic with Mo$_2$B$_2$Fe and U$_2$Pt$_2$Sn anisotropic structures where magnetic frustration is favored. In the case of Ce$_2$Pd$_2$Sn, it was shown that such phase can be suppressed by the application of magnetic field and, in this work, its stability is studied as a function of the electronic concentration by doping the Sn(4+) lattice with In(3+) atoms. Magnetic and specific heat measurements show that around 50\% substitution the Shastry Sutherland lattice vanishes in a critical point. This result confirms the strong dependence of that phase on the electron density because a recent investigation on the Pd rich solid solution Ce$_{2+ε}$Pd$_{2-ε}$In$_{1-x}$Sn$_x$ (with $ε< 0$) demonstrates that atomic disorder dominates the phase diagram at intermediate Sn/In concentration inhibiting magnetic frustration effects. In the alloys investigated in this work, the $ε>0$ character stabilizes the ferromagnetic ground state all along the concentration, allowing the Shastry Sutherland lattice formation on the Sn rich side.

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