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Enhanced two-dimensional behavior of metastable T^{′}-La_{2}CuO_{4}, the parent compound of electron-doped cuprate superconductors

Hord, R. and Luetkens, H. and Pascua, G. and Buckow, A. and Hofmann, K. and Krockenberger, Y. and Kurian, J. and Maeter, H. and Klauss, H.-H. and Pomjakushin, V. and Suter, A. and Albert, B. and Alff, L. (2010):
Enhanced two-dimensional behavior of metastable T^{′}-La_{2}CuO_{4}, the parent compound of electron-doped cuprate superconductors.
In: Physical Review B, APS, pp. 180508-1-180508-4, 82, (18), ISSN 1098-0121,
[Online-Edition: http://dx.doi.org/10.1103/PhysRevB.82.180508],
[Article]

Abstract

We synthesized crystalline bulk samples of lanthanum cuprate in the metastable T′ phase using cesium hydroxide flux. Its crystal structure was determined as space group I4/mmm, no. 139, a=401.02 pm, c=1252.66 pm. Muon spin rotation reveals a gradual slowing down of magnetic fluctuations below TN1≈200 K, and static magnetic order below TN2=115 K, in sharp contrast to La2CuO4 in the T structure where TN1≈TN2≈300 K. Our result shows that the strikingly different magnetic behavior of the two parent compounds has its origin in the two crystal structure modifications. In addition, we find that T′-La2CuO4 has strongly reduced magnetic interactions compared to the other T′ materials Nd2CuO4 and Pr2CuO4, where Nd3+ and Pr3+ are magnetic ions in contrast to the nonmagnetic La3+.

Item Type: Article
Erschienen: 2010
Creators: Hord, R. and Luetkens, H. and Pascua, G. and Buckow, A. and Hofmann, K. and Krockenberger, Y. and Kurian, J. and Maeter, H. and Klauss, H.-H. and Pomjakushin, V. and Suter, A. and Albert, B. and Alff, L.
Title: Enhanced two-dimensional behavior of metastable T^{′}-La_{2}CuO_{4}, the parent compound of electron-doped cuprate superconductors
Language: English
Abstract:

We synthesized crystalline bulk samples of lanthanum cuprate in the metastable T′ phase using cesium hydroxide flux. Its crystal structure was determined as space group I4/mmm, no. 139, a=401.02 pm, c=1252.66 pm. Muon spin rotation reveals a gradual slowing down of magnetic fluctuations below TN1≈200 K, and static magnetic order below TN2=115 K, in sharp contrast to La2CuO4 in the T structure where TN1≈TN2≈300 K. Our result shows that the strikingly different magnetic behavior of the two parent compounds has its origin in the two crystal structure modifications. In addition, we find that T′-La2CuO4 has strongly reduced magnetic interactions compared to the other T′ materials Nd2CuO4 and Pr2CuO4, where Nd3+ and Pr3+ are magnetic ions in contrast to the nonmagnetic La3+.

Journal or Publication Title: Physical Review B
Volume: 82
Number: 18
Publisher: APS
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Advanced Thin Film Technology
07 Department of Chemistry > Fachgebiet Anorganische Chemie
07 Department of Chemistry
Date Deposited: 29 Mar 2012 11:34
Official URL: http://dx.doi.org/10.1103/PhysRevB.82.180508
Identification Number: doi:10.1103/PhysRevB.82.180508
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