Possible spin frustration in Nd$_2$Ti$_2$O$_7$ probed by muon spin relaxation

Hanjie Guo; Hui Xing; Jun Tong; Qian Tao; Isao Watanabe; Zhu-an Xu

doi:10.1088/0953-8984/26/43/436002

Possible spin frustration in Nd$_2$Ti$_2$O$_7$ probed by muon spin relaxation

Strongly Correlated Electrons 2014-10-21 v1 Materials Science

Authors: Hanjie Guo , Hui Xing , Jun Tong , Qian Tao , Isao Watanabe , Zhu-an Xu

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Abstract

Muon spin relaxation on Nd $_2$ Ti $_2$ O $_7$ (NTO) and NdLaTi $_2$ O $_7$ (NLTO) compounds are presented. The time spectra for both compounds are as expected for the paramagnetic state at high temperatures, but deviate from the exponential function below about 100 K. The muon spin relaxation rate increases with decreasing temperature firstly, and then levels off below about 10 K, which is reminiscent of the frustrated systems. An enhancement of the relaxation rate by a longitudinal field in the paramagnetic state is observed for NTO, and eliminated by a magnetic dilution for the NLTO sample. This suggests that the spectral density is modified by a magnetic dilution and thus indicates that the spins behave cooperatively rather than individually. Zero-field measurement at 0.3 K indicates that the magnetic ground state for NTO is ferromagnetic.

Keywords

muon spin relaxation spin frustration Nd$_2$Ti$_2$O$_7$ NdLaTi$_2$O$_7$ paramagnetic state magnetic dilution ferromagnetic ground state

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@article{arxiv.1410.4855,
  title  = {Possible spin frustration in Nd$_2$Ti$_2$O$_7$ probed by muon spin relaxation},
  author = {Hanjie Guo and Hui Xing and Jun Tong and Qian Tao and Isao Watanabe and Zhu-an Xu},
  journal= {arXiv preprint arXiv:1410.4855},
  year   = {2014}
}

Possible spin frustration in Nd$_2$Ti$_2$O$_7$ probed by muon spin relaxation

Abstract

Keywords

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