Distinct vortex-glass phases in Yb3Rh4Sn13 at high and low magnetic fields.
J Phys Condens Matter
; 27(24): 245701, 2015 Jun 24.
Article
en En
| MEDLINE
| ID: mdl-26029819
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, ξ(L)/a0 and ξ(T)/a0, reveal two distinct anomalies that are associated with vortex-glass phases below µ0Hl ≈ 700 G and above µ0Hh â¼ 1.7 T (a0 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 µ0Hc2 (1.8 K) ≈2.5 T. ξ(L)/a0 and ξ(T)/a0, gradually decrease for decreasing fields of strengths less than 1 T and tend towards zero. The shear elastic modulus c66 and the tilting elastic modulus c44 vanish at a critical field µ0Hl ≈ 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. µ0Hc1 = 135 G < µ0H < 700 G. This low-field phenomenon is of different nature than the one observed at high fields, where ξ(L)/a0 but not ξ(T)/a0, decreases abruptly to an intermediate value.
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01-internacional
Base de datos:
MEDLINE
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En
Revista:
J Phys Condens Matter
Asunto de la revista:
BIOFISICA
Año:
2015
Tipo del documento:
Article
País de afiliación:
Suiza
Pais de publicación:
Reino Unido