ISIS Neutron and Muon Source Data Journal

Probing the Superconducting Ground State of Single Crystal Organic Superconductor lambda-(BETS)2GaCl4

Abstract: lambda-(BETS)2GaCl4 is a non-magnetic anion-based organic superconductor SC attracting interest since its Fe analog becomes superconductor by applying 33 T. Both have similar Tc ~5 K. We measured TF and ZF-mSR down to 0.3K in the powder sample. The temperature dependence of the damping rate s(T) of the muon-spin precession related to the penetration depth was investigated in TF= 30 and 60 G. They indicate that SC is not stabilized even at 0.3 K or that there are nodes in the SC gap. We found a possible signature of time-reversal symmetry breaking (TRSB) since we detect slightly enhancement of relaxation rate below Tc in ZF-mSR. For extracting intrinsic & clear result, we are now planning to measure single crystals which can be aligned to make angular dependence measurement possible. We plan to align crystals in order to measure s(T) and TRSB and discuss SC gap symmetry by TF and ZF-mSR.

Principal Investigator: Dr Isao Watanabe
Experimenter: Professor Takehito Nakano
Experimenter: Dr Dita Puspita Sari
Experimenter: Dr Ko-ichi HIRAKI
Experimenter: Dr Yasuyuki Ishii
Experimenter: Dr Majed Abdel Jawad
Experimenter: Dr Retno Asih
Experimenter: Miss Harison Rozak
Experimenter: Professor Lieh-Jeng Chang

DOI: 10.5286/ISIS.E.RB1670565

ISIS Experiment Number: RB1670565

Publisher: STFC ISIS Neutron and Muon Source

Data format: RAW/Nexus
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Data Citation

The recommended format for citing this dataset in a research publication is as:
[author], [date], [title], [publisher], [doi]

For Example:
Dr Isao Watanabe et al; (2019): Probing the Superconducting Ground State of Single Crystal Organic Superconductor lambda-(BETS)2GaCl4, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1670565

Data is released under the CC-BY-4.0 license.