# Magnetic Field Effect on s-wave Superconductor LaRu4P12 Studied by 31P-NMR

## TL;DR

This study uses 31P-NMR measurements to explore how magnetic fields influence the nuclear spin-lattice relaxation rate in the s-wave superconductor LaRu4P12, revealing orbital pair-breaking effects.

## Contribution

It provides the first detailed NMR analysis of magnetic field effects on a conventional full-gap superconductor, highlighting the orbital pair-breaking mechanism.

## Key findings

- Suppression of the Hebel-Slichter peak with increasing magnetic field.
- The relaxation rate 1/T1 at 0.8 K scales with H^2.
- Behavior explained by orbital pair-breaking in a single-band s-wave superconductor.

## Abstract

We have performed 31P-NMR measurements on the s-wave superconductor LaRu4P12 to investigate the magnetic field effect of the nuclear spin-lattice relaxation rate 1/T1 on a conventional full-gap superconductor. With increasing magnetic field, the Hebel-Slichter peak immediately below Tc in 1=T1 was suppressed, and the magnetic field dependence of 1/T1 at 0.8 K, well below Tc, was proportional to H2. These behaviors can be fully understood by the orbital pair-breaking effect in a single-band s-wave superconductor