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Titolo:
Andreev bound-state tunneling and ESR spectroscopy of high-temperature superconductors and observations of broken time-reversal symmetry
Autore:
Greene, LH; Aprili, M; Covington, M; Badica, E; Pugel, DE; Aubin, H; Xia, YM; Salamon, MB; Jain, S; Hinks, DG;
Indirizzi:
Univ Illinois, Dept Phys, Urbana, IL 61801 USA Univ Illinois Urbana IL USA 61801 linois, Dept Phys, Urbana, IL 61801 USA Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA Argonne Natl Lab Argonne IL USA 60439 Div Mat Sci, Argonne, IL 60439 USA
Titolo Testata:
JOURNAL OF SUPERCONDUCTIVITY
fascicolo: 5, volume: 13, anno: 2000,
pagine: 703 - 708
SICI:
0896-1107(200010)13:5<703:ABTAES>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
D-WAVE SUPERCONDUCTORS; YBA2CU3O7 THIN-FILMS; T-C SUPERCONDUCTORS; SURFACE-STATES; VORTEX-CORE; JUNCTIONS; CONDUCTANCE; DEPENDENCE; GAP;
Keywords:
Andreev bound state; tunneling spectroscopy; electron paramagnetic resonance spectroscopy; broken time-reversal symmetry; YBCO; BSCCO;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
58
Recensione:
Indirizzi per estratti:
Indirizzo: Greene, LH Univ Illinois, Dept Phys, 1110 W Green St, Urbana, IL 61801 USAUniv Illinois 1110 W Green St Urbana IL USA 61801 IL 61801 USA
Citazione:
L.H. Greene et al., "Andreev bound-state tunneling and ESR spectroscopy of high-temperature superconductors and observations of broken time-reversal symmetry", J SUPERCOND, 13(5), 2000, pp. 703-708

Abstract

An emphasis on reliable materials growth and development of new fabrication techniques has allowed us to investigate the electronic structure of high-temperature superconductors by planar quasiparticle tunneling and electronparamagnetic resonance (EPR) spectroscopies. The quasiparticle (QP) density of states (DoS) is investigated by tunneling into oriented thin films of Y1Ba2Cu3O7 (YBCO) and single crystals of Ba2Sr2Ca1Cu2O8 (BSCCO). Data are obtained as a function of crystallographic orientation, temperature, doping,damage, and applied magnetic field. These data demonstrate that the observed zero-bias conductance peak (ZBCP) is composed of Andreev bound states (ABS) which intrinsically form at a symmetry-breaking interface of an unconventional superconductor, for example, a (110)surface of d-wave YBCO. Tunneling into doped or ion-damaged YBCO provides a measure of the QP scattering rate below T-c. An applied field causes Doppler shift of the ABS, arising from the scalar product between the QP velocity and the superfluid momentum, v(F).P-s, observed as a splitting in the ZBCP. Magnetic hysteresis of the splitting is consistent with the effects of strong vortex pinning near the interface. The directional field dependence shows that the ABS is highly anisotropic in its transport. These results, plus in-plane crystallographic orientational dependence on single-crystal BSCCO, demonstrate the d-wave symmetry of this superconductor. Below similar to 8 K and in zero applied field, the ZBCP splits, indicating a transition into a superconducting state with spontaneously broken time-reversal symmetry (BTRS). EPR experiments are used to detect directly the spontaneous formation of the magnetic moments inthe BTRS state.

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Documento generato il 26/11/20 alle ore 11:43:16