Experimental evidence of Tc enhancement without the influence of spin fluctuations: NMR study on LaFeAsO1-xHx under a pressure of 3.0 GPa
Abstract
The electron-doped high-transition-temperature (Tc) iron-based pnictide superconductor LaFeAsO1-xHx has a unique phase diagram: superconducting (SC) double domes are sandwiched by antiferromagnetic phases at ambient pressure and they turn to a single dome with a maximum Tc that exceeds 45K at a pressure of 3.0 GPa. We studied whether spin fluctuations are involved in increasing Tc under a pressure of 3.0 GPa by using 75As nuclear magnetic resonance (NMR) technique. The 75As-NMR results for the powder samples show that Tc increases up to 48 K without the influence of spin fluctuations. The fact indicates that spin fluctuations are not involved in raising Tc, which implies that other factors, such as orbital degrees of freedom, may be important for achieving a high Tc of almost 50 K.
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