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首页> 外文期刊>Physical review >Magnetic properties of pseudomorphic epitaxial films of Pr_(0.7)Ca_(0.3)MnO_3 under different biaxial tensile stresses
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Magnetic properties of pseudomorphic epitaxial films of Pr_(0.7)Ca_(0.3)MnO_3 under different biaxial tensile stresses

机译：不同双轴拉伸应力下Pr_（0.7）Ca_（0.3）MnO_3的拟晶外延膜的磁性

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摘要

In order to analyze the effect of strain on the magnetic properties of narrow-band manganites, temperature -and field-dependent susceptibilities of about 8.5-nm-thick epitaxial Pr_(0.7)Ca_(0.3)MnO_3 films, respectively, grown on (001) and (110) SrTiO_3 substrates, have been compared. For ultrathin samples grown on (001) SrTiO_3, a bulklike cluster-glass magnetic behavior is found, indicative of the possible coexistence of antiferromagnetic and ferromagnetic phases. On the contrary, ultrathin films grown on (110) substrates show a robust ferromag-netism with a strong spontaneous magnetization of about 3.4μ_B/Mn atom along the easy axis. On the base of high-resolution reciprocal space mapping analyses performed by x-ray diffraction, the different behaviors are discussed in terms of the crystallographic constraints imposed by the epitaxy of Pr_(0.7)Ca_(0.3)MnO_3 on SrTiO_3. We suggest that for growth on (110) SrTiO3, the tensile strain on the film c axis, lying within the substrate plane, favors the ferromagnetic phase, possibly by allowing a mixed occupancy and hybridization of both in-plane and out-of-plane e_g orbitals. Our data allow to shed some physics of inhomogeneous states in manganites and on the nature of their ferromagnetic insulating state.
机译：为了分析应变对窄带锰矿磁性能的影响，分别在（001）上生长了约8.5 nm厚的外延Pr_（0.7）Ca_（0.3）MnO_3薄膜的温度和磁场相关磁化率。 ）和（110）SrTiO_3衬底已进行了比较。对于在（001）SrTiO_3上生长的超薄样品，发现了块状簇玻璃磁行为，表明可能存在反铁磁相和铁磁相。相反，在（110）衬底上生长的超薄膜显示出强的铁磁性，并沿易轴具有约3.4μB/ Mn原子的强自发磁化强度。在通过x射线衍射进行的高分辨率互易空间映射分析的基础上，根据Pr_（0.7）Ca_（0.3）MnO_3对SrTiO_3的外延施加的晶体学约束，讨论了不同的行为。我们建议，对于在（110）SrTiO3上生长，在膜c轴上位于衬底平面内的拉伸应变有利于铁磁相，这可能是通过允许平面内和平面外的混合占据和杂交来实现的e_g轨道。我们的数据可以揭示锰矿中非均匀状态的某些物理性质及其铁磁绝缘状态的性质。

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  • 来源
    《Physical review》 |2010年第1期|P.014415.1-014415.9|共9页
  • 作者

    A. Geddo Lehmann; F. Congiu; N. Lampis; F. Miletto Granozio; P. Perna; M. Radovic; U. Scotti di Uccio;

  • 作者单位

    Dipartimento di Fisica e CNISM, Universita di Cagliari, S.P. Monserrato-Sestu, km 0.700, 1-09042 Monserrato, Cagliari, Italy;

    Dipartimento di Fisica e CNISM, Universita di Cagliari, S.P. Monserrato-Sestu, km 0.700, 1-09042 Monserrato, Cagliari, Italy;

    Dipartimento di Fisica e CNISM, Universita di Cagliari, S.P. Monserrato-Sestu, km 0.700, 1-09042 Monserrato, Cagliari, Italy;

    CNR-SPIN e Dip. Scienze Fisiche, Universita di Napoli Federico II, Complesso Monte S. Angelo, Via Cinthia, 1-80126 Napoli, Italy;

    CNR-SPIN e Dip. Scienze Fisiche, Universita di Napoli Federico II, Complesso Monte S. Angelo, Via Cinthia, 1-80126 Napoli, Italy;

    CNR-SPIN e Dip. Scienze Fisiche, Universita di Napoli Federico II, Complesso Monte S. Angelo, Via Cinthia, 1-80126 Napoli, Italy;

    CNR-SPIN e Dip. Scienze Fisiche, Universita di Napoli Federico II, Complesso Monte S. Angelo, Via Cinthia, 1-80126 Napoli, Italy;

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  • 关键词

    magnetic properties of monolayers and thin films; narrow-band systems; intermediate-valence solids;

    机译：单层和薄膜的磁性;窄带系统;中价固体;

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