Measurement of Magnetic Exchange in Ferromagnet-Superconductor La2/3Ca1/3MnO3/YBa2Cu3O7 Bilayers

被引：16

作者：

Giblin, S. R. ^{[1
]}

Taylor, J. W. ^{[1
]}

Duffy, J. A. ^{[2
]}

Butchers, M. W. ^{[2
]}

Utfeld, C. ^{[3
]}

Dugdale, S. B. ^{[3
]}

Nakamura, T. ^{[4
]}

Visani, C. ^{[5
]}

Santamaria, J. ^{[5
]}

机构：

[1] Rutherford Appleton Lab, ISIS Facil, Chilton OX11 0QX, Oxon, England

[2] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

[3] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England

[4] SPring 8, Japan Synchrotron Radiat Res Inst, Sayo, Hyogo 6795198, Japan

[5] Univ Complutense Madrid, Dept Fis Aplicada, GFMC, E-28040 Madrid, Spain

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 13期

基金：

英国工程与自然科学研究理事会;

关键词：

RAY CIRCULAR-DICHROISM; COPPER-OXIDE METALS; PSEUDOGAP; INTERFACE;

D O I：

10.1103/PhysRevLett.109.137005

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The existence of coherent magnetic correlations in the normal phase of cuprate high-temperature superconductors has proven difficult to measure directly. Here we report on a study of ferromagnetic-superconductor bilayers of La2/3Ca1/3MnO3/YBa2Cu3O7 (LCMO/YBCO) with varying YBCO layer thicknesses. Using x-ray magnetic circular dichroism, we demonstrate that the ferromagnetic layer induces a Cu magnetic moment in the adjacent high-temperature superconductor. For thin samples, this moment exists at all temperatures below the Curie temperature of the LCMO layer. However, for a YBCO layer thicker than 12 unit cells, the Cu moment is suppressed for temperatures above the superconducting transition, suggesting this to be a direct measurement of magnetic coherence in the normal state of a superconducting oxide.

引用

页数：5

共 27 条

[1] X-RAY CIRCULAR-DICHROISM AND LOCAL MAGNETIC-FIELDS [J].

CARRA, P ;

THOLE, BT ;

ALTARELLI, M ;

WANG, XD .

PHYSICAL REVIEW LETTERS, 1993, 70 (05) :694-697

[2] Orbital reconstruction and covalent bonding at an oxide interface [J].

Chakhalian, J. ;

Freeland, J. W. ;

Habermeier, H.-U. ;

Cristiani, G. ;

Khaliullin, G. ;

van Veenendaal, M. ;

Keimer, B. .

SCIENCE, 2007, 318 (5853) :1114-1117

[3] Magnetism at the interface between ferromagnetic and superconducting oxides [J].

Chakhalian, J ;

Freeland, JW ;

Srajer, G ;

Strempfer, J ;

Khaliullin, G ;

Cezar, JC ;

Charlton, T ;

Dalgliesh, R ;

Bernhard, C ;

Cristiani, G ;

Habermeier, HU ;

Keimer, B .

NATURE PHYSICS, 2006, 2 (04) :244-248

[4] Possible spin-triplet superconducting phase in the La0.7Sr0.3MnO3/YBa2Cu3O7/La0.7Sr0.3MnO3 trilayer [J].

Dybko, K. ;

Werner-Malento, K. ;

Aleshkevych, P. ;

Wojcik, M. ;

Sawicki, M. ;

Przyslupski, P. .

PHYSICAL REVIEW B, 2009, 80 (14)

[5] Triplet supercurrents in clean and disordered half-metallic ferromagnets [J].

Eschrig, Matthias ;

Loefwander, Tomas .

NATURE PHYSICS, 2008, 4 (02) :138-143

[6] Magnetic order in the pseudogap phase of high-TC superconductors [J].

Fauque, B. ;

Sidis, Y. ;

Hinkov, V. ;

Pailhes, S. ;

Lin, C. T. ;

Chaud, X. ;

Bourges, P. .

PHYSICAL REVIEW LETTERS, 2006, 96 (19)

[7] SPring-8 twin helical undulator [J].

Hara, T ;

Tanaka, T ;

Tanabe, T ;

Marechal, XM ;

Kumagai, K ;

Kitamura, H .

JOURNAL OF SYNCHROTRON RADIATION, 1998, 5 :426-427

[8] Evidence from magnetoresistance measurements for an induced triplet superconducting state in La0.7Ca0.3MnO3/YBa2Cu3O7-δ multilayers [J].

Hu, T. ;

Xiao, H. ;

Visani, C. ;

Sefrioui, Z. ;

Santamaria, J. ;

Almasan, C. C. .

PHYSICAL REVIEW B, 2009, 80 (06)

[9]

Hubermeier H.-U., 2001, PHYSICA AMSTERDAM, V364-365, P298

[10] Long-range proximity effect in La2/3Ca1/3MnO3/(100)YBa2Cu3O7-δ ferromagnet/superconductor bilayers: Evidence for induced triplet superconductivity in the ferromagnet [J].

Kalcheim, Yoav ;

Kirzhner, Tal ;

Koren, Gad ;

Millo, Oded .

PHYSICAL REVIEW B, 2011, 83 (06)

← 1 2 3 →