Anisotropy reversal of the upper critical field at low temperatures and spin-locked superconductivity in K2Cr3As3

F. F. Balakirev; T. Kong; M. Jaime; R. D. McDonald; C. H. Mielke; A. Gurevich; P. C. Canfield; S. L. Bud'Ko

doi:10.1103/PhysRevB.91.220505

Anisotropy reversal of the upper critical field at low temperatures and spin-locked superconductivity in K2Cr3As3

F. F. Balakirev, T. Kong, M. Jaime, R. D. McDonald, C. H. Mielke, A. Gurevich, P. C. Canfield, S. L. Bud'Ko

Research output: Contribution to journal › Article › peer-review

43 Scopus citations

Abstract

We report measurements of the anisotropic upper critical field Hc2(T) for K2Cr3As3 single crystals up to 60 T and T>0.6K. Our results show that the upper critical field parallel to the Cr chains, Hc2¥(T), exhibits a paramagnetically limited behavior, whereas the shape of the Hc2¥(T) curve (perpendicular to the Cr chains) has no evidence of paramagnetic effects. As a result, the curves Hc2¥(T) and Hc2¥(T) cross at T≈4K, so that the anisotropy parameter γH(T)=Hc2¥/Hc2¥(T) increases from γH(Tc)≈0.35 near Tc to γH(0)≈1.7 at 0.6 K. The paramagnetically limited behavior of Hc2¥(T) is inconsistent with triplet superconductivity but suggests a form of singlet superconductivity with the electron spins locked onto the direction of Cr chains.

Original language	English (US)
Article number	220505
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	91
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.91.220505
State	Published - Jun 23 2015
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.91.220505

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Anisotropy reversal of the upper critical field at low temperatures and spin-locked superconductivity in K2Cr3As3. / Balakirev, F. F.; Kong, T.; Jaime, M.; McDonald, R. D.; Mielke, C. H.; Gurevich, A.; Canfield, P. C.; Bud'Ko, S. L.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 91, No. 22, 220505, 23.06.2015.

Research output: Contribution to journal › Article › peer-review

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abstract = "We report measurements of the anisotropic upper critical field Hc2(T) for K2Cr3As3 single crystals up to 60 T and T>0.6K. Our results show that the upper critical field parallel to the Cr chains, Hc2¥(T), exhibits a paramagnetically limited behavior, whereas the shape of the Hc2¥(T) curve (perpendicular to the Cr chains) has no evidence of paramagnetic effects. As a result, the curves Hc2¥(T) and Hc2¥(T) cross at T≈4K, so that the anisotropy parameter γH(T)=Hc2¥/Hc2¥(T) increases from γH(Tc)≈0.35 near Tc to γH(0)≈1.7 at 0.6 K. The paramagnetically limited behavior of Hc2¥(T) is inconsistent with triplet superconductivity but suggests a form of singlet superconductivity with the electron spins locked onto the direction of Cr chains.",

author = "Balakirev, {F. F.} and T. Kong and M. Jaime and McDonald, {R. D.} and Mielke, {C. H.} and A. Gurevich and Canfield, {P. C.} and Bud'Ko, {S. L.}",

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AU - Kong, T.

AU - Jaime, M.

AU - McDonald, R. D.

AU - Mielke, C. H.

AU - Gurevich, A.

AU - Canfield, P. C.

AU - Bud'Ko, S. L.

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N2 - We report measurements of the anisotropic upper critical field Hc2(T) for K2Cr3As3 single crystals up to 60 T and T>0.6K. Our results show that the upper critical field parallel to the Cr chains, Hc2¥(T), exhibits a paramagnetically limited behavior, whereas the shape of the Hc2¥(T) curve (perpendicular to the Cr chains) has no evidence of paramagnetic effects. As a result, the curves Hc2¥(T) and Hc2¥(T) cross at T≈4K, so that the anisotropy parameter γH(T)=Hc2¥/Hc2¥(T) increases from γH(Tc)≈0.35 near Tc to γH(0)≈1.7 at 0.6 K. The paramagnetically limited behavior of Hc2¥(T) is inconsistent with triplet superconductivity but suggests a form of singlet superconductivity with the electron spins locked onto the direction of Cr chains.

AB - We report measurements of the anisotropic upper critical field Hc2(T) for K2Cr3As3 single crystals up to 60 T and T>0.6K. Our results show that the upper critical field parallel to the Cr chains, Hc2¥(T), exhibits a paramagnetically limited behavior, whereas the shape of the Hc2¥(T) curve (perpendicular to the Cr chains) has no evidence of paramagnetic effects. As a result, the curves Hc2¥(T) and Hc2¥(T) cross at T≈4K, so that the anisotropy parameter γH(T)=Hc2¥/Hc2¥(T) increases from γH(Tc)≈0.35 near Tc to γH(0)≈1.7 at 0.6 K. The paramagnetically limited behavior of Hc2¥(T) is inconsistent with triplet superconductivity but suggests a form of singlet superconductivity with the electron spins locked onto the direction of Cr chains.

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Anisotropy reversal of the upper critical field at low temperatures and spin-locked superconductivity in K2Cr3As3

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