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arXiv 1407.0569cond-mat.supr-con
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高、低磁场下Yb $_{3}$ Rh $_{4}$ Sn $_{13}$中的涡旋玻璃相

Distinct vortex-glass phases in Yb$_{3}$Rh$_{4}$Sn$_{13}$ at high and low magnetic fields

D. G. Mazzone, J. L. Gavilano, R. Sibille, M. Ramakrishnan, C. D. Dewhurst, M. Kenzelmann

摘要:

用小角中子散射(SANS)方法研究了锡系超导体Yb $_{3}$ Rh $_{4}$ Sn $_{13}$混合态的涡旋晶格(VL)。VL、$ξ_L/a_0$和$ξ_T /a_0$的归一化纵向和横向相关长度的场依赖性揭示了两种明显的异常,它们与$μ_0H_l$ ~ $\approx$ ~700~G以下和$μ_{0}H_h$ ~ $\sim$ ~1.7~T以上的涡旋玻璃相有关($a_0$是涡旋间距离)。在1.7 T左右的高场下,纵向相关随场的增加而突然减小,表明由于相变到玻璃相,VL减弱(但不是完全破坏),低于$μ_{0}H_{c_2}$(1.8 K)~ $\approx$ ~2.5 T。$ξ_L/a_0$和$ξ_T /a_0$随着强度小于1~T的磁场的减小而逐渐减小,并趋于零。剪切弹性模量$c_{66}$和倾斜弹性模量$c_{44}$在临界场$μ_0H_l$ ~ $\approx$ ~700~G处消失,为无序诱导的涡旋玻璃转变提供了证据.对于低于700 G的场,观察到散射强度的“环”,$i.e.$,$μ_{0}H_{c_1}$ ~=~135~G~ $<$ ~ $μ_{0}H$ ~ $<$ ~~700~G.这种低场现象与在高场观察到的现象性质不同,在高场观察到的现象中,$ξ_L/a_0$而不是$ξ_T/a_0$突然减小到中间值。

英文摘要:

The vortex lattice (VL) in the mixed state of the stannide superconductor Yb$_{3}$Rh$_{4}$Sn$_{13}$ has been studied using small-angle neutron scattering (SANS). The field dependencies of the normalized longitudinal and transverse correlation lengths of the VL, $ξ_L/a_0$ and $ξ_T /a_0$, reveal two distinct anomalies that are associated with vortex-glass phases below $μ_0H_l$~$\approx$~700~G and above $μ_{0}H_h$~$\sim$~1.7~T ($a_0$ is the intervortex distance). At high fields, around 1.7~T, the longitudinal correlation decreases abruptly with increasing fields indicating a weakening (but not a complete destruction) of the VL due to a phase transition into a glassy phase, below $μ_{0}H_{c_2}$(1.8 K)~$\approx$~2.5~T. $ξ_L/a_0$ and $ξ_T /a_0$, gradually decrease for decreasing fields of strengths less than 1~T and tend towards zero. The shear elastic modulus $c_{66}$ and the tilting elastic modulus $c_{44}$ vanish at a critical field $μ_0H_l$~$\approx$~700~G, providing evidence for a disorder-induced transition into a vortex-glass. A 'ring' of scattered intensity is observed for fields lower than 700~G, $i.e.$, $μ_{0}H_{c_1}$~=~135~G~$<$~$μ_{0}H$~$<$~700~G. This low-field phenomenon is of different nature than the one observed at high fields, where $ξ_L/a_0$ but not $ξ_T/a_0$, decreases abruptly to an intermediate value.

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