Weak ferromagnetism of La 1.99 Sr 0.01 Cu O 4 thin films: Evidence for the removal of corrugation in the Cu O 2 plane by epitaxial strain
Weak ferromagnetism of La 1.99 Sr 0.01 Cu O 4 thin films: Evidence for the removal of corrugation in the Cu O 2 plane by epitaxial strain
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La 1.99 Sr 0.01 Cu O 4 薄膜的弱铁磁性：通过外延应变消除 Cu O 2 平面波纹的证据
DOI：
10.1103/physrevb.70.174520
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发表时间：
2004
影响因子：
3.7
通讯作者：
I. Tsukada
中科院分区：
文献类型：
--
作者：
I. Tsukada
采用磁阻法研究了La_{1.99}Sr_{0.01}CuO_4外延薄膜的弱铁磁性。虽然在YAlO_3（001）上生长的薄膜中明显观察到与弱铁磁转变相关的阶梯状负磁电阻，但在SrTiO_3（100）和（LaAlO_3）_{0.3}(SrAl_{0.5}Ta_{0.5}O_3)_{0.7}（100）上生长的薄膜中明显抑制了负磁电阻，而在LaSrAlO_4（001）上生长的薄膜中几乎消失。阶梯形磁阻的强烈抑制表明，在四边形衬底上生长的薄膜中，特别是在LaSrAlO_4（001）上生长的CuO_2平面比在块状晶体中生长的薄膜波纹要小得多。
The weak ferromagnetism of La_{1.99}Sr_{0.01}CuO_4 epitaxial thin films is investigated using magnetoresistance measurement. While a steplike negative magnetoresistance associated with the weak ferromagnetic transition is clearly observed in the films grown on YAlO_3(001), it is notably suppressed in the films grown on SrTiO_3(100) and (LaAlO_3)_{0.3}(SrAl_{0.5}Ta_{0.5}O_3)_{0.7}(100), and almost disappears in films grown on LaSrAlO_4(001). The strong suppression of the steplike magnetoresistance provides evidence that the CuO_2 planes are much less corrugated in thin films grown on tetragonal substrates, particularly on LaSrAlO_4(001), than in bulk crystals.