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Sharp Magnetization Jump at the First-order Superconducting Transition in Sr2RuO4 | | Shunichiro Kittaka
; Akira Kasahara
; Toshiro Sakakibara
; Daisuke Shibata
; Shingo Yonezawa
; Yoshiteru Maeno
; Kenichi Tenya
; Kazushige Machida
; | | Date: |
3 Oct 2014 | | Abstract: | Magnetization and magnetic torque of a high-quality single crystal of
Sr$_2$RuO$_4$ have been measured down to 0.1 K under a precise control of the
magnetic-filed orientation. When the magnetic field is applied exactly parallel
to the $ab$ plane, a sharp magnetization jump, $4pidelta M$, of $(0.74 pm
0.15)$ G at the upper critical field $H_{{
m c2},{ab}} sim 15$ kOe with a
field hysteresis of 100 Oe is observed at low temperatures, evidencing the
first-order superconducting-normal transition. A strong magnetic torque
appearing when $H$ is slightly tilted away from the $ab$ plane confirms the
intrinsic anisotropy $varGamma=xi_a/xi_c$ of as large as 60 even at 100 mK,
in contrast with the observed $H_{{
m c2}}$ anisotropy of $sim 20$. The
present results raise fundamental issues in both the existing spin-triplet and
spin-singlet scenarios, providing in turn crucial hints toward resolution of
the superconducting nature of Sr$_2$RuO$_4$. | | Source: | arXiv, 1410.0798 | | Services: | Forum | Review | PDF | Favorites | |
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