ISIS Neutron and Muon Source Data Journal

Superconducting Pairing Symmetry in a Hole-doped Organic Superconductor kappa-(ET)4Hg2.89Br8 probed by muSR

Abstract: Organic superconductors (SCs) generally have fixed band filling as 1/2 or 1/4. But, kappa-(ET)4Hg2.89Br8 (k-HgBr) is an exceptional one because 11%-hole doping electronic state from the 1/2-filled band is realized, while ET dimers form the triangular lattice. In the metallic state under pressure, a non-Fermi liquid behavior was observed in the low-pressure range and gradually changed to a Fermi-liquid one with a critical pressure Pc~0.5 GPa. This metallic state undergoes SC with a broad transition width at 4.3 K. The upper critical field in the perpendicular configuration, Bc2, under low-pressure obviously exceeds Pauli limit, Bp. There is no example of that Bc2 exceeds Bp among organic SCs which may indicate the nature of triplet superconductivity. As the first step, we would like to clarify whether triplet SC is realized in k-HgBr at ambient pressure down to 0.3 K by zero-field muSR.

Experimenter: Dr Isao Watanabe
Experimenter: Professor Hiromi Taniguchi
Local Contact: Dr Dita Puspita Sari
Experimenter: Dr Yasuyuki Ishii

DOI: 10.5286/ISIS.E.RB1970114

ISIS Experiment Number: RB1970114

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; (2020): Superconducting Pairing Symmetry in a Hole-doped Organic Superconductor kappa-(ET)4Hg2.89Br8 probed by muSR, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1970114

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