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X-ray absorption study of the ferromagnetic Cu moment at the YBa_(2)Cu_(3)O_(7)/La_(2/3)Ca_(1/3)MnO_(3) interface and variation of its exchange interaction with the Mn moment

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Varela del Arco, María and otros, ... (2016) X-ray absorption study of the ferromagnetic Cu moment at the YBa_(2)Cu_(3)O_(7)/La_(2/3)Ca_(1/3)MnO_(3) interface and variation of its exchange interaction with the Mn moment. Physical review B, 93 (20). ISSN 2469-9950

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Official URL: http://dx.doi.org/10.1103/PhysRevB.93.205131


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Abstract

With x-ray absorption spectroscopy and polarized neutron reflectometry we studied how the magnetic proximity effect at the interface between the cuprate high-TC superconductor YBa_(2)Cu_(3)O_(7) (YBCO) and the ferromagnet La_(2/3)Ca_(1/3)MnO_(3) (LCMO) is related to the electronic and magnetic properties of the LCMO layers. In particular, we explored how the magnitude of the ferromagnetic Cu moment on the YBCO side depends on the strength of the antiferromagnetic (AF) exchange coupling with the Mn moment on the LCMO side. We found that the Cu moment remains sizable if the AF coupling with the Mn moments is strongly reduced or even entirely suppressed. The ferromagnetic order of the Cu moments thus seems to be intrinsic to the interfacial CuO_(2) planes and related to a weakly ferromagnetic intraplanar exchange interaction. The latter is discussed in terms of the partial occupation of the Cu 3d_(3z^(2)−r^(2)) orbitals, which occurs in the context of the so-called orbital reconstruction of the interfacial Cu ions.


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© 2016 American Physical Society. Artículo firmado por 17 autores. The work at UniFr was supported by the Schweizer Nationalfonds (SNF) through Grants No. 200020-153660 and No. CRSII2-154410/1. The work at Muni was supported by the projects CEITEC(CZ.1.05/1.1.00/02.0068) and MUNI/A/1496/2014. The XAS measurements were performed at the EPFL/PSI XTreme beamline of the Swiss Light Source at the Paul Scherrer Institut, Villigen, Switzerland. The neutron experiment was done at the NREX instrument operated by the Max-Planck Society at the Heinz MaierLeibnitz Zentrum (MLZ), Garching, Germany, and was supported by the European Commission under the 7th Framework Programme through the “Research Infrastructures” action of the Capacities Programme, NMI3-II, Grant No. 283883.

Uncontrolled Keywords:Circular-dichroism; Superconducting oxides; Transition; Magnetization; Reflectivity; Films.
Subjects:Sciences > Physics > Electricity
Sciences > Physics > Electronics
ID Code:38448
Deposited On:11 Jul 2016 08:26
Last Modified:10 Dec 2018 14:57

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