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首页> 外文期刊>Physical review >Contrasting effect of La substitution on the magnetic moment direction in the Kondo semiconductors CeT_2 Al_(10) (T=Ru,Os)
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Contrasting effect of La substitution on the magnetic moment direction in the Kondo semiconductors CeT_2 Al_(10) (T=Ru,Os)

机译：La替代对近藤半导体CeT_2 Al_（10）（T = Ru，Os）中磁矩方向的影响

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摘要

The opening of a spin gap in the orthorhombic compounds CeT_2Al_(10) (T = Ru and Os) is followed by antiferromagnetic ordering at T_N = 27 and 28.5 K, respectively, with a small ordered moment (0.29-0.34μ_B) along the c axis, which is not an easy axis of the crystal field (CEF). In order to investigate how the moment direction and the spin gap energy change with La doping in Ce_(1-x)La_xT_2Al_(10) (T = Ru and Os) and also to understand the microscopic nature of the magnetic ground state, we here report on magnetic, transport, and thermal properties, neutron diffraction (ND), and inelastic neutron scattering (INS) investigations on these compounds. Our INS study reveals the persistence of spin gaps of 7 and 10 meV in the 10% La-doped T = Ru and Os compounds, respectively. More interestingly our ND study shows a very small ordered moment of 0.18 μ_B along the b axis in Ce_(0.9)La_(0.1)Ru_2Al_(10), however a moment of 0.23 μ_B still along the c axis in Ce_(0.9)La_(0.1)Os_2Al_(10). This contrasting behavior can be explained by a different degree of hybridization in CeRu_2Al_(10) and CeOs_2Al_(10), being stronger in the latter than in the former. Muon spin rotation (μ_(SR)) studies on Ce_(1-x)La_xRu_2Al_(10) (x = 0, 0.3, 0.5, and 0.7), reveal the presence of coherent frequency oscillations indicating a long-range magnetically ordered ground state for x = 0 to 0.5, but an almost temperature independent Kubo-Toyabe response between 45 Mk and 4 K for x = 0.7. We compare the results of the present investigations with those reported on the electron and hole doping in CeT_2Al_(10).
机译：在正交晶体化合物CeT_2Al_（10）（T = Ru和Os）中自旋间隙的打开之后，分别在T_N = 27和28.5 K处进行反铁磁有序化，沿c沿较小的有序矩（0.29-0.34μ_B）轴，这不是晶体场（CEF）的易轴。为了研究在Ce_（1-x）La_xT_2Al_（10）（T = Ru和Os）中La掺杂时矩方向和自旋隙能量如何变化，并了解磁基态的微观性质，我们在这里报告了这些化合物的磁，输运和热性能，中子衍射（ND）和非弹性中子散射（INS）研究。我们的INS研究揭示了在10％La掺杂的T = Ru和Os化合物中，自旋间隙的持久性分别为7和10 meV。更有趣的是，我们的ND研究显示Ce_（0.9）La_（0.1）Ru_2Al_（10）中沿b轴的有序矩非常小，为0.18μ_B，而Ce_（0.9）La_（c）沿c轴的矩为0.23μB。 0.1）Os_2Al_（10）。这种对比行为可以通过CeRu_2Al_（10）和CeOs_2Al_（10）中不同程度的杂交来解释，后者比前者更强。 Ce_（1-x）La_xRu_2Al_（10）（x = 0、0.3、0.5和0.7）的μ自旋旋转（μ_（SR））研究表明存在相干频率振荡，表明长程磁有序基态x = 0至0.5时，但x = 0.7时，在45 Mk和4 K之间几乎与温度无关的Kubo-Toyabe响应。我们将本研究的结果与关于CeT_2Al_（10）中的电子和空穴掺杂的报道进行比较。

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  • 来源
    《Physical review》 |2015年第9期|094425.1-094425.10|共10页
  • 作者

    D. T. Adroja; A. D. Hillier; C. Ritter; A. Bhattacharyya; D. D. Khalyavin; A. M. Strydom; P. Peratheepan; B. Fak; M. M. Koza; J. Kawabata; Y. Yamada; Y. Okada; Y. Muro; T. Takabatake; J. W. Taylor;

  • 作者单位

    ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, United Kingdom,Highly Correlated Matter Research Group, Physics Department, University of Johannesburg, Auckland Park 2006, South Africa;

    ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, United Kingdom;

    Institut Laue-Langevin, BP 156, 6 Rue Jules Horowitz 38042, Grenoble Cedex, France;

    ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, United Kingdom,Highly Correlated Matter Research Group, Physics Department, University of Johannesburg, Auckland Park 2006, South Africa;

    ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, United Kingdom;

    Highly Correlated Matter Research Group, Physics Department, University of Johannesburg, Auckland Park 2006, South Africa,Institute for Solid State Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10/138, 1040 Vienna, Austria;

    Highly Correlated Matter Research Group, Physics Department, University of Johannesburg, Auckland Park 2006, South Africa,Department of Physics, Eastern University, Vantharumoolai, Chenkalady 30350, Sri Lanka;

    Institut Laue-Langevin, BP 156, 6 Rue Jules Horowitz 38042, Grenoble Cedex, France;

    Institut Laue-Langevin, BP 156, 6 Rue Jules Horowitz 38042, Grenoble Cedex, France;

    Department of Quantum Matter, ADSM and IAMR, Hiroshima University, Higashi-Hiroshima 739-8530, Japan;

    Department of Quantum Matter, ADSM and IAMR, Hiroshima University, Higashi-Hiroshima 739-8530, Japan;

    Department of Quantum Matter, ADSM and IAMR, Hiroshima University, Higashi-Hiroshima 739-8530, Japan;

    Faculty of Engineering, Toyama Prefectural University, Toyama 939-8530, Japan;

    Department of Quantum Matter, ADSM and IAMR, Hiroshima University, Higashi-Hiroshima 739-8530, Japan;

    ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, United Kingdom;

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  • 正文语种 eng
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  • 关键词

    strongly correlated electron systems; heavy fermions; valence fluctuation, kondo lattice, and heavy-fermion phenomena; local moment in compounds and alloys; kondo effect, valence fluctuations, heavy fermions; inelastic neutron scattering;

    机译：强相关电子系统;重费米子价态波动;近藤晶格和重费米子现象;化合物和合金中的局部力矩;近藤效应;化合价涨落;费米重子;非弹性中子散射;

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