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Zero-Bias Anomalies Observed in the Tunneling Spectra of Sr<sub>3</sub>(Ru<sub>0.84</sub>Mn<sub>0.16</sub>)<sub>2</sub>O<sub>7</sub>

ORAL

Abstract

The partial substitution of Mn for Ru in the bilayer ruthenate Sr3(Ru1-xMnx)2O7 stabilizes long-range antiferromagnetic (AFM) ordering with the highest transition temperature TN= 82 K for x = 0.16 [1]. Here, we report the observation of a well-defined symmetric zero-bias anomaly (ZBA) at 5.2 K in the scanning tunneling spectroscopy (STS) of x = 0.16. The temperature dependence of the ZBA shows thermal broadening and does not correlate with the bulk AFM transition. Consistent with this observation, there is no change in the ZBA with the application of a magnetic field (9T). This is in contrast to the case for x = 0, in which the ZBA is asymmetric about zero bias and magnetic field dependent which gradually vanished at 11T [2]. The more symmetric and narrower ZBA in x = 0.16 could originate from the distinct surface properties [3]. We will discuss the relationship between doping (disorder), the surface properties, and ZBA.


[1] B. Hu, G. T. McCandless, M. Menard, V. B. Nascimento, J. Y. Chan, E. W. Plummer, and R. Jin, Physical Review B 81, 184104 (2010).
[2] K. Iwaya et al., Physical Review Letters 99, 057208 (2007).
[3] C. Chen et al., Physical Review B 94, 085420 (2016).

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Presenters

  • Yifan Yang

    Louisiana State University, Baton Rouge

Authors

  • Yifan Yang

    Louisiana State University, Baton Rouge

  • Mingming Fu

    Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge, TN 37831, USA, Center for Nanophase Materials Sciences, Oak Ridge National Lab

  • Qiang Zou

    Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge, TN 37831, USA, CNMS, Oak Ridge National Lab

  • Rongying Jin

    Louisiana State University, Baton Rouge, Department of Physics & Astronomy, Louisiana State University, Louisiana State University, Baton Rouge, LA 70803 USA, Physics, Louisiana State University, Louisiana State University

  • Zheng Gai

    Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge, TN 37831, USA, Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, CNMS, Oak Ridge National Lab, Center for Nanophase Materials Sciences, Oak Ridge National Lab

  • Jiandi Zhang

    Louisiana State University, Baton Rouge

  • E Ward Plummer

    Louisiana State University, Baton Rouge, Department of Physics & Astronomy, Louisiana State University