Magnetic properties and orbital anisotropy driven by Mn2+ in nonstoichiometric LaxMnO3-delta thin films

@article{ ISI:000287653900009,
Author = {Galdi, A. and Aruta, C. and Orgiani, P. and Brookes, N. B. and
   Ghiringhelli, G. and Moretti Sala, M. and Mangalam, R. V. K. and
   Prellier, W. and Lueders, U. and Maritato, L.},
Title = {{Magnetic properties and orbital anisotropy driven by Mn2+ in
   nonstoichiometric LaxMnO3-delta thin films}},
Journal = {{PHYSICAL REVIEW B}},
Year = {{2011}},
Volume = {{83}},
Number = {{6}},
Month = {{FEB 23}},
Abstract = {{Magnetic measurements by complementary techniques have shown that the
   substitution of Mn2+ in the A site strongly influences the electronic
   and magnetic properties of nonstoichiometric LaxMnO3-delta thin films (x
   = 0.66 -> 1.07). We have studied a series of samples deposited on SrTiO3
   (100) substrates by molecular beam epitaxy. SQUID magnetometer has been
   used to measure the dependence of magnetization on temperature and
   applied magnetic field between 400 K and 10 K. Mn L-2,L-3 x-ray
   absorption spectra (XAS) have revealed the presence of Mn2+ in the
   samples with smaller x, which are ferromagnetic. The dependence of XAS
   on linear polarization (linear dichroism) has revealed the magnetic
   anisotropy and the orbital preferential occupation as a function of x.
   Magnetic hysteresis loops and magnetic circular dichroism have allowed
   us to determine the ferromagnetic easy axis and the presence of a second
   coercive field in some of the samples. O K edge XAS has provided an
   insight into the band hybridization as a function of the La/Mn ratio and
   Mn2+ content. The experimental results reveal the double role of
   divalent Mn in these films. For x << 1 the Mn2+ ions at the A site
   stabilize to a robust ferromagnetic phase (T-C similar or equal to 350
   K) and influence the orbital occupation of Mn3+ at the B site in the
   residual antiferromagnetic phase. These results indicate that
   substitution of La3+ with a magnetic divalent ion (Mn2+) gives rise to
   structural distortions overcoming the uniaxial strain induced by the
   substrate and to an unexpectedly strong superexchange interaction
   between A and B sites.}},
Publisher = {{AMER PHYSICAL SOC}},
Address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
Type = {{Article}},
Language = {{English}},
Affiliation = {{Galdi, A (Corresponding Author), CNR, SPIN, Via Ponte don Melillo, I-84084 Fisciano, SA, Italy.
   Galdi, A.; Orgiani, P.; Maritato, L., CNR, SPIN, I-84084 Fisciano, SA, Italy.
   Galdi, A., Univ Salerno, Dipartimento Fis ER Caianiello, I-84084 Fisciano, SA, Italy.
   Aruta, C., CNR, SPIN, I-80126 Naples, Italy.
   Orgiani, P.; Maritato, L., Univ Salerno, Dipartimento Matemat & Informat, I-84084 Fisciano, SA, Italy.
   Brookes, N. B., European Synchrotron Radiat Facil, F-38043 Grenoble, France.
   CNR, SPIN, I-20133 Milan, Italy.
   Ghiringhelli, G.; Moretti Sala, M., Politecn Milan, Dipartimento Fis, I-20133 Milan, Italy.
   Moretti Sala, M., CNR, IOM, I-20133 Milan, Italy.
   Mangalam, R. V. K.; Prellier, W.; Lueders, U., ENSICAEN, CNRS, Lab CRISMAT, UMR 6508, F-14050 Caen, France.}},
DOI = {{10.1103/PhysRevB.83.064418}},
Article-Number = {{064418}},
ISSN = {{2469-9950}},
EISSN = {{2469-9969}},
Keywords-Plus = {{RAY-ABSORPTION-SPECTROSCOPY; MANGANESE OXIDES; PHASE-DIAGRAM;
   MANGANITES; DICHROISM; MAGNETORESISTANCE; ORDER}},
Research-Areas = {{Materials Science; Physics}},
Web-of-Science-Categories  = {{Materials Science, Multidisciplinary; Physics, Applied; Physics,
   Condensed Matter}},
Author-Email = {{alice.galdi@sa.infn.it}},
ResearcherID-Numbers = {{Prellier, W/AAB-3819-2019
   Orgiani, Pasquale/AAC-8703-2019
   Moretti, Marco/AAF-9255-2019
   Murugavel, Pattukannu/AAC-5400-2020
   Brookes, Nicholas B/C-6718-2019
   Galdi, Alice/J-5072-2012
   Aruta, Carmela/L-2957-2015
   Ghiringhelli, Giacomo/D-1159-2014
   Orgiani, Pasquale/E-7146-2013
   Sala, Marco Moretti/H-1034-2014
   }},
ORCID-Numbers = {{Prellier, W/0000-0002-1492-2837
   Orgiani, Pasquale/0000-0002-1082-9651
   Moretti, Marco/0000-0002-9744-9976
   Murugavel, Pattukannu/0000-0002-4074-9118
   Brookes, Nicholas B/0000-0002-1342-9530
   Galdi, Alice/0000-0003-2863-5393
   Aruta, Carmela/0000-0002-6917-6667
   Ghiringhelli, Giacomo/0000-0003-0867-7748
   Orgiani, Pasquale/0000-0002-1082-9651
   Sala, Marco Moretti/0000-0002-9744-9976
   Mangalam, Vengadesh Kumara/0000-0003-0625-5576
   Luders, Ulrike/0000-0002-5766-8031}},
Funding-Acknowledgement = {{CEFIPRA/IFPCAR {[}3908-1]}},
Funding-Text = {{The authors wish to thank R. Ciancio for the experimental collaboration
   on the EDS measurements. WP, UL and VKM acknowledge the CEFIPRA/IFPCAR
   project (3908-1).}},
Number-of-Cited-References = {{45}},
Times-Cited = {{17}},
Usage-Count-Last-180-days = {{2}},
Usage-Count-Since-2013 = {{29}},
Journal-ISO = {{Phys. Rev. B}},
Doc-Delivery-Number = {{725OC}},
Unique-ID = {{ISI:000287653900009}},
DA = {{2020-12-22}},
}