Institute of Physics, National Chiao Tung University

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Institute of Physics, National Chiao Tung University Coexistence of Ferromagnetic order and superconductivity in YBa2Cu3O7/La0.7Ca0.3MnO3 bilayers Jiunn–Yuan Lin (林俊源) Quantum Matter Lab Institute of Physics, National Chiao Tung University

5Institute of Physics, Academia Sinica, Taipei 11529, Taiwan Jiunn-Yuan Lin,1,2 Shih-Wen Huang,2,3 L. Andrew Wray,2 Horng-Tay Jeng,4,5 J. M. Lee,6 M. C. Langer,3 V. T. Tra,2 J. M. Chen,6 Y. H. Chu,7,5 S. Roy,1 R. W. Schoenlein,3 and Yi-De Chuang1 Institute of Physics, National Chiao Tung University, Hsinchu 30010, Taiwan 2Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA 3Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA 4Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan 5Institute of Physics, Academia Sinica, Taipei 11529, Taiwan 6National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan 7Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, 30010, Taiwan

Rivalry between superconductivity and ferromagnetic order Contents Rivalry between superconductivity and ferromagnetic order YBCO/LCMO bilayers with termination control Resonant soft X-ray scattering spectroscopy (RSXS) Observation of coexistence of ferromagnetic order and superconductivity in YBCO Control of this coexistence by termination types 12/15/2014 NCTU 2013 Summer School

Rivalry between superconductivity and ferromagnetism s-wave p-wave d-wave Superconducting order parameters Ferromagnetic order parameter

Hi-Tc superconductor YBa2Cu3O7 d-wave supercondutivity, no magnetic order

Magnetism Beyond the interface

“The interface is the device.” ~Herbert Kroemer

TEM images

Synchrotron reflectivity measurement of a YBCO/LCMO bilayer at 80 K With YBCO / LCMO layer thickness of 15 nm / 7.5nm 6/29/2013 NCTU 2013 Summer School

The bilayers are superconducting!

Interface magnetism of YBCO/LCMO Chakhalian et al., 2006

Long range antiferromagnetic coupling across the interface due to DM interaction G. M. De Luca et al., 2014

X-ray absorption spectra and resonance profile of YBCO (001) Bragg peak (resonant soft X-ray scattering spectroscopy, RSXS)

Schematic illustration of the experimental geometry NCTU 2013 Summer School

Magnetism Beyond the interface

RSXS- temperature dependence

First principles calculations

No induced Magnetism Beyond the interface with La0.7Ca0.3O termination

RSXS- temperature dependence

First principles calculations

S-FM coexistence induces new states? FFLO state: cooper pairs with finite momentum H. Mayaffre et al., 2014

Majorona Fermions chiral p-wave superconductors C. W. J. Beenakeer, 2013

Summary (S. W. Huang et al., arXiv:1504.01820) The first observation of coexistence of ferromagnetic order and superconductivity in YBCO. This new quantum state certainly generates new possibilities.