Magnetic study of the UPt3 superconducting phases

Stephan Schöttl; Erwin A. Schuberth; Jan B. Kycia; William P. Halperin

doi:10.1016/S0921-4526(99)01554-9

Magnetic study of the UPt₃ superconducting phases

Stephan Schöttl, Erwin A. Schuberth^*, Jan B. Kycia, William P. Halperin

^*Corresponding author for this work

Physics and Astronomy

Research output: Contribution to journal › Conference article › peer-review

1 Scopus citations

Abstract

In order to distinguish the UPt₃ superconducting (s.c.) phases we have studied their magnetic properties at low fields in a SQUID magnetometer and up to fields > H_c2(0) with a capacitive torque-meter. With the SQUID we measure the magnetic penetration depth and find the second s.c. transition at T_c^- when the field is applied along the c-axis, but not with H⊥ĉ. This result, combined with power-law behavior at low temperature T, is most consistent with the two-dimensional E_2u s.c. order parameter. Below 20 mK we find an additional diamagnetic signal that we ascribe to the normal state magnetism. In high fields our torque measurements show a kink of the perpendicular magnetization component at the B-C phase line, pointing to an enhanced Ginzburg-Landau parameter in the C phase.

Original language	English (US)
Pages (from-to)	174-175
Number of pages	2
Journal	Physica B: Condensed Matter
Volume	280
Issue number	1-4
DOIs	https://doi.org/10.1016/S0921-4526(99)01554-9
State	Published - 2000
Event	22nd International Conference on Low Temperature Physics (LT-22) - Helsinki, Finland Duration: Aug 4 1999 → Aug 11 1999

Funding

We gratefully acknowledge discussions with Profs. J. Sauls, P.J. Hirschfeld, and Dr. D. Einzel. The work was supported by the NSF, Grant No. DMR-9705473.

Keywords

Heavy fermions
Penetration depth
Torque measurement
UPt

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Access to Document

10.1016/S0921-4526(99)01554-9

Cite this

@article{2cbd47d9b07a45698bb5ae4f100d8238,

title = "Magnetic study of the UPt3 superconducting phases",

abstract = "In order to distinguish the UPt3 superconducting (s.c.) phases we have studied their magnetic properties at low fields in a SQUID magnetometer and up to fields > Hc2(0) with a capacitive torque-meter. With the SQUID we measure the magnetic penetration depth and find the second s.c. transition at Tc- when the field is applied along the c-axis, but not with H⊥ĉ. This result, combined with power-law behavior at low temperature T, is most consistent with the two-dimensional E2u s.c. order parameter. Below 20 mK we find an additional diamagnetic signal that we ascribe to the normal state magnetism. In high fields our torque measurements show a kink of the perpendicular magnetization component at the B-C phase line, pointing to an enhanced Ginzburg-Landau parameter in the C phase.",

keywords = "Heavy fermions, Penetration depth, Torque measurement, UPt",

author = "Stephan Sch{\"o}ttl and Schuberth, {Erwin A.} and Kycia, {Jan B.} and Halperin, {William P.}",

note = "Funding Information: We gratefully acknowledge discussions with Profs. J. Sauls, P.J. Hirschfeld, and Dr. D. Einzel. The work was supported by the NSF, Grant No. DMR-9705473. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.; 22nd International Conference on Low Temperature Physics (LT-22) ; Conference date: 04-08-1999 Through 11-08-1999",

year = "2000",

doi = "10.1016/S0921-4526(99)01554-9",

language = "English (US)",

volume = "280",

pages = "174--175",

journal = "Physica B: Condensed Matter",

issn = "0921-4526",

publisher = "Elsevier B.V.",

number = "1-4",

}

TY - JOUR

T1 - Magnetic study of the UPt3 superconducting phases

AU - Schöttl, Stephan

AU - Schuberth, Erwin A.

AU - Kycia, Jan B.

AU - Halperin, William P.

N1 - Funding Information: We gratefully acknowledge discussions with Profs. J. Sauls, P.J. Hirschfeld, and Dr. D. Einzel. The work was supported by the NSF, Grant No. DMR-9705473. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.

PY - 2000

Y1 - 2000

N2 - In order to distinguish the UPt3 superconducting (s.c.) phases we have studied their magnetic properties at low fields in a SQUID magnetometer and up to fields > Hc2(0) with a capacitive torque-meter. With the SQUID we measure the magnetic penetration depth and find the second s.c. transition at Tc- when the field is applied along the c-axis, but not with H⊥ĉ. This result, combined with power-law behavior at low temperature T, is most consistent with the two-dimensional E2u s.c. order parameter. Below 20 mK we find an additional diamagnetic signal that we ascribe to the normal state magnetism. In high fields our torque measurements show a kink of the perpendicular magnetization component at the B-C phase line, pointing to an enhanced Ginzburg-Landau parameter in the C phase.

AB - In order to distinguish the UPt3 superconducting (s.c.) phases we have studied their magnetic properties at low fields in a SQUID magnetometer and up to fields > Hc2(0) with a capacitive torque-meter. With the SQUID we measure the magnetic penetration depth and find the second s.c. transition at Tc- when the field is applied along the c-axis, but not with H⊥ĉ. This result, combined with power-law behavior at low temperature T, is most consistent with the two-dimensional E2u s.c. order parameter. Below 20 mK we find an additional diamagnetic signal that we ascribe to the normal state magnetism. In high fields our torque measurements show a kink of the perpendicular magnetization component at the B-C phase line, pointing to an enhanced Ginzburg-Landau parameter in the C phase.

KW - Heavy fermions

KW - Penetration depth

KW - Torque measurement

KW - UPt

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DO - 10.1016/S0921-4526(99)01554-9

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VL - 280

SP - 174

EP - 175

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

IS - 1-4

T2 - 22nd International Conference on Low Temperature Physics (LT-22)

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