Field dependence of the specific heat in a heavy-fermion superconductor CeIrIn5

Yuya Aoki; Shunichiro Kittaka; Toshiro Sakakibara; Akito Sakai; Satoru Nakatsuji; Yasumasa Tsutsumi; Masanori Ichioka; Kazushige Machida

doi:10.1143/JPSJS.81SB.SB014

Field dependence of the specific heat in a heavy-fermion superconductor CeIrIn₅

Yuya Aoki, Shunichiro Kittaka, Toshiro Sakakibara, Akito Sakai, Satoru Nakatsuji, Yasumasa Tsutsumi, Masanori Ichioka, Kazushige Machida

Research Institute for Interdisciplinary Science

Research output: Contribution to journal › Article

1 Citation (Scopus)

Abstract

We investigated temperature, field, and field-orientation dependences of the specific heat of CeIrIn₅. The upper critical field H_c2 was determined down to 80 mK from the specific heat measurements and exhibits a slight suppression at low temperatures. We revealed that the specific heat at 80 mK increases proportional to the square root of H up to nearly H_c2 for both H ∥ ab and H ∥ c, implying the presence of line nodes and a weak contribution of the Pauli paramagnetic pair-breaking effect. Furthermore, we revealed that the specific heat shows a fourfold oscillation under a rotating magnetic field in the ab plane. This result indicates that CeIrIn ₅has fourfold symmetry around the c axis in its gap amplitude.

Original language	English
Article number	SB014
Journal	journal of the physical society of japan
Volume	81
Issue number	SUPPL.B
DOIs	https://doi.org/10.1143/JPSJS.81SB.SB014
Publication status	Published - Sep 2012

Keywords

Heavy fermion
Specific heat
Superconducting gap
Superconductor

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1143/JPSJS.81SB.SB014

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Aoki, Y., Kittaka, S., Sakakibara, T., Sakai, A., Nakatsuji, S., Tsutsumi, Y., Ichioka, M., & Machida, K. (2012). Field dependence of the specific heat in a heavy-fermion superconductor CeIrIn₅. journal of the physical society of japan, 81(SUPPL.B), [SB014]. https://doi.org/10.1143/JPSJS.81SB.SB014

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title = "Field dependence of the specific heat in a heavy-fermion superconductor CeIrIn5",

abstract = "We investigated temperature, field, and field-orientation dependences of the specific heat of CeIrIn5. The upper critical field Hc2 was determined down to 80 mK from the specific heat measurements and exhibits a slight suppression at low temperatures. We revealed that the specific heat at 80 mK increases proportional to the square root of H up to nearly Hc2 for both H ∥ ab and H ∥ c, implying the presence of line nodes and a weak contribution of the Pauli paramagnetic pair-breaking effect. Furthermore, we revealed that the specific heat shows a fourfold oscillation under a rotating magnetic field in the ab plane. This result indicates that CeIrIn 5has fourfold symmetry around the c axis in its gap amplitude.",

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T1 - Field dependence of the specific heat in a heavy-fermion superconductor CeIrIn5

AU - Aoki, Yuya

AU - Kittaka, Shunichiro

AU - Sakakibara, Toshiro

AU - Sakai, Akito

AU - Nakatsuji, Satoru

AU - Tsutsumi, Yasumasa

AU - Ichioka, Masanori

AU - Machida, Kazushige

PY - 2012/9

Y1 - 2012/9

N2 - We investigated temperature, field, and field-orientation dependences of the specific heat of CeIrIn5. The upper critical field Hc2 was determined down to 80 mK from the specific heat measurements and exhibits a slight suppression at low temperatures. We revealed that the specific heat at 80 mK increases proportional to the square root of H up to nearly Hc2 for both H ∥ ab and H ∥ c, implying the presence of line nodes and a weak contribution of the Pauli paramagnetic pair-breaking effect. Furthermore, we revealed that the specific heat shows a fourfold oscillation under a rotating magnetic field in the ab plane. This result indicates that CeIrIn 5has fourfold symmetry around the c axis in its gap amplitude.

AB - We investigated temperature, field, and field-orientation dependences of the specific heat of CeIrIn5. The upper critical field Hc2 was determined down to 80 mK from the specific heat measurements and exhibits a slight suppression at low temperatures. We revealed that the specific heat at 80 mK increases proportional to the square root of H up to nearly Hc2 for both H ∥ ab and H ∥ c, implying the presence of line nodes and a weak contribution of the Pauli paramagnetic pair-breaking effect. Furthermore, we revealed that the specific heat shows a fourfold oscillation under a rotating magnetic field in the ab plane. This result indicates that CeIrIn 5has fourfold symmetry around the c axis in its gap amplitude.

KW - Heavy fermion

KW - Specific heat

KW - Superconducting gap

KW - Superconductor

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