Fig. 3: Magnetotransport and magnetization of superconducting H2TiSe2. | Communications Physics

Fig. 3: Magnetotransport and magnetization of superconducting H2TiSe2.

From: Superconductivity induced by gate-driven hydrogen intercalation in the charge-density-wave compound 1T-TiSe2

Fig. 3

a, Resistivity ρ of a H2TiSe2 crystal as a function of temperature T in the superconducting transition, normalized by its normal-state value ρ0, for increasing magnetic field H applied orthogonal to the crystal ab plane. b, Same data of a plotted in semilogarithmic scale as a function of T−1, highlighting the Arrhenius behavior characteristic of thermally-activated flux flow (TAFF). The side panel shows the TAFF activation energy U as a function of μ0H. Dashed black line is the linear fit to the data in semilogarithmic scale which allows determining the characteristic energy U0 and magnetic field μ0H0. c, T-dependence of the magnetic moment m, recorded under zero-field cooling (ZFC) conditions with μ0H = 1 mT magnetic field applied perpendicular to the ab plane. The arrow indicates the T below which the magnetic moment starts deviating from its normal-state value, thus defining the diamagnetic onset temperature \({T}_{{{{{{{{\rm{c}}}}}}}}}^{{{{{{{{\rm{on}}}}}}}}}=3.6\pm 0.1\) K. d, ZFC magnetic moment as a function of H measured isothermally at T = 2 K. The line is a guide to the eyes. The inset shows a magnification of the low-field region, with a linear fit on the first six points (line). The arrow indicates the field above which the magnetic moment starts deviating from a linear dependence, thus defining the first critical field Hc1 = 1.3 ± 0.3 mT. e, H − T phase diagram of H2TiSe2 constructed by combining the results from resistivity and magnetization measurements on multiple different crystals. Shaded blue regions highlight the Meissner state and the TAFF state. Red and indigo circles are obtained from the data shown in a and d respectively. Blue and green circles are obtained from Supplementary Fig. 6a and b respectively. Dashed blue lines are linear fits to the resistive critical magnetic field Hc2 (defined as the threshold for reaching ρ(T) = 0.95ρ0) above and below the kink at T/Tc ≈ 0.85. The resistive Hc2 data for CuxTiSe226 and ion-gated TiSe230 are shown for comparison.

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