The upper critical field and its anisotropy in RbCr${}_3$As${}_3$

Abstract

The temperature dependence of the upper critical field ($H_{c2}$) in RbCrAs${}_3$ single crystals ($T_c\approx$ 7.3 K) has been determined by means of magnetoresistance measurements with temperature down to 0.35 K in static magnetic fields up to 38 T. The magnetic field was applied both for directions parallel ($H\parallel c$, $H_{c2}^{\parallel c}$) and perpendicular ($H\perp c$, $H_{c2}^{\perp c}$) to the Cr chains. The curves $H_{c2}^{\parallel c}(T)$ and $H_{c2}^{\perp c}(T)$ cross at $\sim$ 5.5 K. As a result, the anisotropy parameter $\gamma (T)=H_{c2}^{\perp c}/H_{c2}^{\parallel c}(T)$ increases from 0.5 near $T_c$ to 1.6 at low temperature. Fitting with the Werthamer-Helfand-Hohenberg (WHH) model yields zero-temperature critical fields of ${\mu }_0{H}_{c2}^{\parallel c}(0)\approx$ 27.2 T and ${\mu }_0{H}_{c2}^{\perp c}(0)\approx$ 43.4 T, both exceeding the BCS weak-coupling Pauli limit ${\mu }_0{H}_p=1.84T_c=13.4$ T. The results indicate that the paramagnetic pair breaking effect is strong for $H\parallel c$ but absent for $H\perp c$, which was further confirmed by the angle dependent magnetoresistance and $H_{c2}$ measurements.

6 pages, 5 figures

References in corpus (15)

• Nearly Isotropic superconductivity in (Ba,K)Fe2As2
• Superconductivity in the vicinity of antiferromagnetic order in CrAs
• Superconductivity in quasi-one-dimensional K${}_2$Cr${}_3$As${}_3$ with significant electron correlations
• Unconventional superconductivity in quasi-one-dimensional Rb${}_2$Cr${}_3$As${}_3$
• Superconductivity in quasi-one-dimensional Cs2Cr3As3 with large interchain distance
• Upper critical field, anisotropy, and superconducting properties of Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ single crystals
• Evidence for dominant Pauli paramagnetic effect in the upper critical fields of a FeTe0.6Se0.4 superconductor
• Anisotropic $H_{c2}$, thermodynamic and transport measurements, and pressure dependence of $T_c$ in K${}_2$Cr${}_3$As${}_3$ single crystals
• Superconductivity at 5 K in quasi-one-dimensional Cr-based KCr3As3 single crystals
• Multiband one-dimensional electronic structure and spectroscopic signature of Tomonoga-Luttinger liquid behavior in K${}_2$Cr${}_3$As${}_3$
• Superconductivity at 7.3 K in the 133-type Cr-based RbCr3As3 single crystals
• Strong Pauli paramagnetic effect in the upper critical field of KCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Peculiar properties of Cr${}_3$As${}_3$-chain-based superconductors
• Structural Instability and Magnetism of Superconducting KCr${}_3$As${}_3$
• Nodal-line pairing with 1D-3D coupled Fermi surfaces: a model motivated by Cr-based superconductors

Cited by in corpus (1)

• Upper critical fields in high-$T_{\mathrm{c}}$ superconductors