Uncommonly high upper critical field of the pyrochlore superconductor KOs_2O_6 below the enhanced paramagnetic limit

by: T Shibauchi, L Krusin-Elbaum, Y Kasahara, Y Shimono, Y Matsuda, RD Mcdonald, CH Mielke, S Yonezawa, Z Hiroi, M Arai, T Kita, G Blatter, M Sigrist

Physical Review B (Condensed Matter and Materials Physics), Vol. 74, No. 22. (December 2006), 220506.

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DOI, NASA ADS, http://link.aps.org/abstract/PRB/v74/e220…

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Abstract

The entire temperature dependence of the upper critical field Hc2 in the beta -pyrochlore KOs2O6 is obtained from high-field resistivity and magnetic measurements. Both techniques identically give Hc2(T~=0K) not only surprisingly high (˜33T) , but also the approach to it is unusually temperature linear all the way below Tc(=9.6K) . We show that, while Hc2(0) exceeds a simple spin-singlet paramagnetic limit HP , it is well below an HP enhanced due to the missing spatial inversion symmetry reported recently in KOs2O6 , ensuring that the pair breaking here is executed by orbital degrees. Ab initio calculations of orbital Hc2 show that an unusual temperature dependence is reproduced if dominant s -wave superconductivity resides on the smaller closed Fermi surfaces.

@article{citeulike:2874756, abstract = {The entire temperature dependence of the upper critical field Hc2 in the beta -pyrochlore KOs2O6 is obtained from high-field resistivity and magnetic measurements. Both techniques identically give Hc2(T\~{}=0K) not only surprisingly high (˜33T) , but also the approach to it is unusually temperature linear all the way below Tc(=9.6K) . We show that, while Hc2(0) exceeds a simple spin-singlet paramagnetic limit HP , it is well below an HP enhanced due to the missing spatial inversion symmetry reported recently in KOs2O6 , ensuring that the pair breaking here is executed by orbital degrees. Ab initio calculations of orbital Hc2 show that an unusual temperature dependence is reproduced if dominant s -wave superconductivity resides on the smaller closed Fermi surfaces.}, author = {Shibauchi, T. and Krusin-Elbaum, L. and Kasahara, Y. and Shimono, Y. and Matsuda, Y. and Mcdonald, R. D. and Mielke, C. H. and Yonezawa, S. and Hiroi, Z. and Arai, M. and Kita, T. and Blatter, G. and Sigrist, M. }, citeulike-article-id = {2874756}, doi = {10.1103/PhysRevB.74.220506}, journal = {Physical Review B (Condensed Matter and Materials Physics)}, keywords = {experiment, kos2o6, pyrochlore, rattling}, month = {December}, number = {22}, pages = {220506+}, posted-at = {2008-06-09 08:25:54}, priority = {0}, publisher = {American Physical Society}, title = {Uncommonly high upper critical field of the pyrochlore superconductor KOs\_2O\_6 below the enhanced paramagnetic limit}, url = {http://dx.doi.org/10.1103/PhysRevB.74.220506}, volume = {74}, year = {2006} }

RIS record

TY - JOUR ID - citeulike:2874756 L3 - citeulike-article-id:2874756 TI - Uncommonly high upper critical field of the pyrochlore superconductor KOs_2O_6 below the enhanced paramagnetic limit JF - Physical Review B (Condensed Matter and Materials Physics) VL - 74 IS - 22 SP - 220506 PB - American Physical Society N2 - The entire temperature dependence of the upper critical field Hc2 in the beta -pyrochlore KOs2O6 is obtained from high-field resistivity and magnetic measurements. Both techniques identically give Hc2(T~=0K) not only surprisingly high (˜33T) , but also the approach to it is unusually temperature linear all the way below Tc(=9.6K) . We show that, while Hc2(0) exceeds a simple spin-singlet paramagnetic limit HP , it is well below an HP enhanced due to the missing spatial inversion symmetry reported recently in KOs2O6 , ensuring that the pair breaking here is executed by orbital degrees. Ab initio calculations of orbital Hc2 show that an unusual temperature dependence is reproduced if dominant s -wave superconductivity resides on the smaller closed Fermi surfaces. KW - experiment KW - kos2o6 KW - pyrochlore KW - rattling AU - Shibauchi, T AU - Krusin-Elbaum, L AU - Kasahara, Y AU - Shimono, Y AU - Matsuda, Y AU - Mcdonald, RD AU - Mielke, CH AU - Yonezawa, S AU - Hiroi, Z AU - Arai, M AU - Kita, T AU - Blatter, G AU - Sigrist, M PY - 2006/12// UR - http://dx.doi.org/10.1103/PhysRevB.74.220506 ER -

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