Abstract
The magnetic property of a thulium-based superconductor, Tm 5 Rh 6 Sn 18 (superconducting transition temperature T c = 2.2 K ), is investigated by muon spin relaxation ( μ SR ) . Below around 6 K, the development of a quasi-static local magnetic field is clearly inferred from the observation of spontaneous oscillation signal in the μ SR spectra under zero external field, where the magnetism persists even below T c . The internal magnetic field at the muon site, H μ , is estimated to be approximately 175 Oe. The fractional volume of the magnetic component is estimated to be 100%, strongly suggesting that the magnetism coexists with superconductivity.
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