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The electron-doped high-transition-temperature (T_c) iron-based pnictidesuperconductor LaFeAsO_{1-x}H_x has a unique phase diagram: superconducting(SC) double domes are sandwiched by antiferromagnetic phases at ambientpressure and they turn to a single dome with a maximum T_c that exceeds 45K ata pressure of 3.0 GPa. We studied whether spin fluctuations are involved inincreasing T_c under a pressure of 3.0 GPa by using ^{75}As nuclear magneticresonance (NMR) technique. The ^{75}As-NMR results for the powder samples showthat T_c increases up to 48 K without the influence of spin fluctuations. Thefact indicates that spin fluctuations are not involved in raising T_c, whichimplies that other factors, such as orbital degrees of freedom, may beimportant for achieving a high T_c of almost 50 K.

Experimental evidence of $T_c$ enhancement without the influence of spin fluctuations: NMR study on LaFeAsO_{1-x}H_x under a pressure of 3.0 GPa