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Distinct vortex-glass phases in Yb3Rh4Sn13 at high and low magnetic fields

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Mazzone Daniel et al.,
Project Superconductivity in Unconventional Metals and its Interplay with Magnetism
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Original article (peer-reviewed)

Journal OURNAL OF PHYSICS-CONDENSED MATTER
Volume (Issue) 27(24)
Page(s) 245701
Title of proceedings OURNAL OF PHYSICS-CONDENSED MATTER
DOI 10.1088/0953-8984/27/24/245701

Abstract

The vortex lattice (VL) in the mixed state of the stannide superconductor Yb3Rh4Sn13 has been studied using small-angle neutron scattering (SANS). The field dependences of the normalized longitudinal and transverse correlation lengths of the VL, xi(L)/a(0) and xi(T)/a(0), reveal two distinct anomalies that are associated with vortex-glass phases below mu H-0(l) approximate to 700G and above mu H-0(h) similar to 1.7T (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 mu H-0(c2) (1.8 K) approximate to 2.5T. xi(L)/a(0) and xi(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 mu H-0(l) approximate to 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. mu H-0(c1) = 135G < mu H-0 < 700 G. This low-field phenomenon is of different nature than the one observed at high fields, where xi(L)/a(0) but not xi(T)/a(0), decreases abruptly to an intermediate value.
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