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 output: Contribution to journal › Article › peer-review

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)

Access to Document

10.1143/JPSJS.81SB.SB014

Cite this

Field dependence of the specific heat in a heavy-fermion superconductor CeIrIn₅. / Aoki, Yuya; Kittaka, Shunichiro; Sakakibara, Toshiro; Sakai, Akito; Nakatsuji, Satoru; Tsutsumi, Yasumasa; Ichioka, Masanori; Machida, Kazushige.

In: journal of the physical society of japan, Vol. 81, No. SUPPL.B, SB014, 09.2012.

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

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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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AU - Aoki, Yuya

AU - Kittaka, Shunichiro

AU - Sakakibara, Toshiro

AU - Sakai, Akito

AU - Nakatsuji, Satoru

AU - Tsutsumi, Yasumasa

AU - Ichioka, Masanori

AU - Machida, Kazushige

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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.

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