Anisotropic $H_{c2}$, thermodynamic and transport measurements, and pressure dependence of $T_{c}$ in K$_{2}$Cr$_{3}$As$_{3}$ single crystals

Tai Kong; Sergey L. Bud'ko; Paul C. Canfield

doi:10.1103/PhysRevB.91.020507

paper

Anisotropic $H_{c 2}$ , thermodynamic and transport measurements, and pressure dependence of $T_{c}$ in K $_{2}$ Cr $_{3}$ As $_{3}$ single crystals

arXiv:1501.01554 · doi:10.1103/PhysRevB.91.020507

Abstract

We present a detailed study of single crystalline K $_{2}$ Cr $_{3}$ As $_{3}$ and analyze its thermodynamic and transport properties, anisotropic $H_{c 2} (T)$ , and initial pressure-dependence of $T_{c}$ . In zero-field, the temperature-dependent resistivity is metallic. Deviation from a linear temperature-dependence is evident below 100 K and a $T^{3}$ -dependence is roughly followed from just above $T_{c}$ ( $\sim$ 10 K) to $\sim$ 40 K. Anisotropic $H_{c 2} (T)$ data were measured up to 140 kOe with field applied along and perpendicular to the rod-like crystals. For the applied field perpendicular to the rod, $H_{c 2} (T)$ is linear with a slope $\sim$ -70 kOe/K. For field applied along the rod, the slope is about -120 kOe/K below 70 kOe. Above 70 kOe, the magnitude of the slope decreases to $\sim$ -70 kOe/K. The electronic specific heat coefficient, $γ$ , just above $T_{c}$ , is 73 mJ/mol K $^{2}$ ; the Debye temperature, $Θ_{D}$ , is 220 K. The specific heat jump at the superconducting transition $Δ$ C $\sim$ 2.2 $γ T_{c}$ . Finally, for hydrostatic pressures up to $\sim$ 7 kbar, $T_{c}$ decreases under pressure linearly at a rate of -0.034 K/kbar.

arXiv commentfigures are revised

Anisotropic $H_{c 2}$ , thermodynamic and transport measurements, and pressure dependence of $T_{c}$ in K $_{2}$ Cr $_{3}$ As $_{3}$ single crystals

Abstract

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Anisotropic Hc2​, thermodynamic and transport measurements, and pressure dependence of Tc​ in K2​Cr3​As3​ single crystals

Abstract

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Cited by in corpus (52)

Anisotropic $H_{c 2}$ , thermodynamic and transport measurements, and pressure dependence of $T_{c}$ in K $_{2}$ Cr $_{3}$ As $_{3}$ single crystals