Gianrico Lamura¹, Daniel Tay², Roustem Khassanov³, Paola Gentile⁴, Chunqiang Xu⁵, Xianglin Ke⁶, Ifeanyi John Onuorah⁷, Pietro Bonfà^8,9*, Xiaofeng Xu^10*, Toni Shiroka^2,3*

1 CNR-SPIN, I-16152 Genova, Italy

2 Laboratorium für Festkörperphysik, ETH Zürich, CH-8093 Zürich, Switzerland

3 PSI Center for Neutron and Muon Sciences CNM, CH-5232 Villigen PSI, Switzerland

4 CNR-SPIN, I-84084 Fisciano (Salerno), Italy

5 School of Physical Science and Technology, Ningbo University, 315211 Ningbo, China

6 Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-2320, USA

7 Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, Parco Area delle Scienze 7/A, I-43124 Parma, Italy

8 Dipartimento di Scienze Fisiche, Informatiche e Matematiche, Università di Modena e Reggio Emilia, via Campi 213/a, 41125 Modena, Italy

9 CNR — Istituto Nanoscienze, via Campi 213/a, 41125 Modena, Italy

10 School of Physics, Zhejiang University of Technology, Hangzhou 310023, China

* Corresponding authors emails: pietro.bonfa@unimore.it, xuxiaofeng@zjut.edu.cn, toni.shiroka@psi.ch

DOI10.24435/materialscloud:d5-x1 [version v1]

Publication date: Mar 19, 2025

How to cite this record

Gianrico Lamura, Daniel Tay, Roustem Khassanov, Paola Gentile, Chunqiang Xu, Xianglin Ke, Ifeanyi John Onuorah, Pietro Bonfà, Xiaofeng Xu, Toni Shiroka, Anisotropic superconductivity in the quasi-one-dimensional superconductor, Materials Cloud Archive 2025.43 (2025), https://doi.org/10.24435/materialscloud:d5-x1

Description

The intermetallic quasi-one-dimensional binary superconductor V₂Ga₅ was recently found to exhibit a topologically nontrivial normal state, making it a natural candidate for a topological superconductor. By combining dc-magnetization, nuclear magnetic resonance, and muon-spin rotation (µSR) measurements on high-quality V₂Ga₅ single crystals, we investigate the electronic properties of its normal- and superconducting ground states. NMR measurements in the normal state indicate a strong anisotropy in both the line shifts and the relaxation rates. Such anisotropy persists also in the superconducting state, as shown by the magnetization and µSR-spectroscopy results. In the latter case, data collected at different temperatures, pressures, and directions of the magnetic field (with respect to the crystalline axes) evidence a fully-gapped, strongly anisotropic superconductivity. At the same time, hydrostatic pressure is shown to only lower the Tc value, but not to change the superfluid density nor its temperature dependence. Lastly, we discuss the search for topological signatures in the normal state of V₂Ga₅, as well as a peak splitting in the FFT of the µSR spectrum, possibly related to an unconventional vortex lattice. Our results suggest that V₂Ga₅ is a novel system, whose anisotropy plays a key role in determining its unusual electronic properties.

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Keywords

Superconductivity Nuclear Magnetic Resonance Muon Spin Rotation and Relaxation Spectroscopy