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Title: Magnetism at the interface between ferromagnetic and superconducting oxides.

Abstract

No abstract prepared.

Authors:
; ; ; ; ; ; ; ; ; ; ; ;  [1]; ; ;
  1. (APS)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
914770
Report Number(s):
ANL/XFD/JA-55173
TRN: US200812%%57
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nat. Phys.; Journal Volume: 2; Journal Issue: Apr. 2006
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; MAGNETISM; OXIDES; INTERFACES; FERROMAGNETIC MATERIALS; SUPERCONDUCTORS

Citation Formats

Chakhalian, J., Freeland, J. W., Srajer, G., Strempfer, J., Khaliullin, G., Cezar, J. C., Charlton, T., Dalgliesh, R., Bernhard, C., Cristiani, G., Habermeier, H-U., Keimer, B., Experimental Facilities Division, Max Planck Inst. for Solid State Research, ESRF, and Rutherford Appleton Lab. Magnetism at the interface between ferromagnetic and superconducting oxides.. United States: N. p., 2006. Web. doi:10.1038/nphys272.
Chakhalian, J., Freeland, J. W., Srajer, G., Strempfer, J., Khaliullin, G., Cezar, J. C., Charlton, T., Dalgliesh, R., Bernhard, C., Cristiani, G., Habermeier, H-U., Keimer, B., Experimental Facilities Division, Max Planck Inst. for Solid State Research, ESRF, & Rutherford Appleton Lab. Magnetism at the interface between ferromagnetic and superconducting oxides.. United States. doi:10.1038/nphys272.
Chakhalian, J., Freeland, J. W., Srajer, G., Strempfer, J., Khaliullin, G., Cezar, J. C., Charlton, T., Dalgliesh, R., Bernhard, C., Cristiani, G., Habermeier, H-U., Keimer, B., Experimental Facilities Division, Max Planck Inst. for Solid State Research, ESRF, and Rutherford Appleton Lab. Sat . "Magnetism at the interface between ferromagnetic and superconducting oxides.". United States. doi:10.1038/nphys272.
@article{osti_914770,
title = {Magnetism at the interface between ferromagnetic and superconducting oxides.},
author = {Chakhalian, J. and Freeland, J. W. and Srajer, G. and Strempfer, J. and Khaliullin, G. and Cezar, J. C. and Charlton, T. and Dalgliesh, R. and Bernhard, C. and Cristiani, G. and Habermeier, H-U. and Keimer, B. and Experimental Facilities Division and Max Planck Inst. for Solid State Research and ESRF and Rutherford Appleton Lab.},
abstractNote = {No abstract prepared.},
doi = {10.1038/nphys272},
journal = {Nat. Phys.},
number = Apr. 2006,
volume = 2,
place = {United States},
year = {Sat Apr 01 00:00:00 EST 2006},
month = {Sat Apr 01 00:00:00 EST 2006}
}
  • The so-called proximity effect is the manifestation, across an interface, of the systematic competition between magnetic order and superconductivity. This phenomenon has been well documented and understood for conventional superconductors coupled with metallic ferromagnets; however it is still less known for oxide materials, where much higher critical temperatures are offered by copper oxide-based superconductors. In this paper, we show that, even in the absence of direct Cu–O–Mn covalent bonding, the interfacial CuO 2 planes of superconducting La 1.85Sr 0.15CuO 4 thin films develop weak ferromagnetism associated to the charge transfer of spin-polarised electrons from the La 0.66Sr 0.33MnO 3 ferromagnet.more » Theoretical modelling confirms that this effect is general to all cuprate/manganite heterostructures and the presence of direct bonding only affects the strength of the coupling. Finally, the Dzyaloshinskii–Moriya interaction, also at the origin of the weak ferromagnetism of bulk cuprates, propagates the magnetisation from the interface CuO 2 planes into the superconductor, eventually depressing its critical temperature.« less
  • To determine the {ital T}{sub {ital c}} dependence of the colossal magnetoresistance (CMR) exhibited by the ferromagnetic La{sub 0.7}A{sub 0.3}MnO{sub 3+{delta}} (A=Ba, Ca, Sr) system, we examine the magnetic-field and temperature-dependent resistivity and magnetization of a series of thin films that were grown via pulsed-laser deposition. The films had magnetic ordering temperatures ({ital T}{sub {ital c}}) ranging from 150 to 350 K. All samples display a large negative MR that is largest near {ital T}{sub {ital c}}, and samples with a low {ital T}{sub {ital c}} display significantly larger MR values than do samples with large {ital T}{sub {ital c}}{close_quote}s.more » The quantity {rho}({ital T}{sub {ital c}})/{rho}(4 K), the amount by which the resistivity is reduced by full ferromagnetic order, varies as exp({ital E}{sub {ital a}}/{ital T}{sub {ital c}}) with an activation energy {ital E}{sub {ital a}}=0.1 eV. These results indicate that the magnitude of the CMR effect in a given specimen is controlled not by {rho}({ital T}{sub {ital c}}), but by {ital T}{sub {ital c}} via the ratio {rho}({ital T}{sub {ital c}})/{rho}(4 K). Phenomenological scaling relationships are also reported that link {rho}({ital H},{ital T}) to both {ital H} and {ital M}({ital H},{ital T}). {copyright} {ital 1996 American Institute of Physics.}« less
  • In this paper we report the results of an extensive investigation of the La{sub 0.7}Ca{sub 0.3}Mn{sub 1{minus}x}Co{sub x}O{sub 3} system. Substitution of Mn by Co dilutes the double-exchange (DE) mechanism and changes the long range ferromagnetic order of La{sub 0.7}Ca{sub 0.3}MnO{sub 3} to a cluster glass-type ferromagnetic (FM) order similar to that observed in La{sub 0.7}Ca{sub 0.3}CoO{sub 3}. This happens even for the lowest Co substitution of x=0.05 and persists over the entire composition range studied (0.05{le}x{le}0.5). The Co substitution also destroys the metallic state and the resistivity increases by orders of magnitude even with a very small extent ofmore » Co substitution. The charge localization due to Co substitution is likely to have its origin in polaronic lattice distortion. The Co substitution also suppresses the colossal magnetoresistance (CMR) of the pure manganate (x=0) over the entire temperature and composition range and it becomes very small for x{ge}0.2. We conclude that the DE interaction and the resulting metallic state is very {open_quotes}fragile{close_quotes} and hence even a small amount of Co substitution can destroy the FM order, the metallic state, and the CMR. {copyright} {ital 1997} {ital The American Physical Society}« less
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