Line Plot from Scientific Research

Temperature dependence of boson density < n >= 1 − M / M s for various magnetic fields H around the QCP. The dashed line represents < n >= T / T 0 , and T 0 = 11 K = 2.2 J . The arrows indicate T c determined from the peak in d M /d T (Fig. 2e,f ). The solid line represents < n c >= Dk B T BEC (−ln( k B T BEC / E c ) + 2) with a cut-off energy E c = 0.2 mK and D = √3/2π J for J = 5 K (Fig. 3c ).

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