Abstract
To identify the superconducting gap symmetry in CeCoIn5 (Tc=2.3K), we measured the angle-resolved specific heat (Cφ) in a field rotated around the c axis down to a very low temperature, 0.05Tc, and made detailed theoretical calculations. In a field of 1 T, a sign reversal of the fourfold angular oscillation in Cφ was observed at T≃0.1Tc upon entering a quasiclassical regime where the maximum of Cφ corresponds to the antinodal direction, coinciding with the angle-resolved density of states (ADOS) calculation. The Cφ behavior, which exhibits minima along the [110] directions, unambiguously allows us to conclude dx2-y2 symmetry of this system. The ADOS-quasiclassical region is confined to a narrow T and H domain within T/Tc∼0.1 and 1.5 T (0.13Hc2).
| Original language | English |
|---|---|
| Article number | 037002 |
| Journal | Physical Review Letters |
| Volume | 104 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Jan 22 2010 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Sign reversal of field-angle resolved heat capacity oscillations in a heavy fermion superconductor CeCoIn5 and dx2-y2 pairing symmetry. / An, K.; Sakakibara, T.; Settai, R.; Onuki, Y.; Hiragi, M.; Ichioka, Masanori; Machida, K.
In: Physical Review Letters, Vol. 104, No. 3, 037002, 22.01.2010.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Sign reversal of field-angle resolved heat capacity oscillations in a heavy fermion superconductor CeCoIn5 and dx2-y2 pairing symmetry
AU - An, K.
AU - Sakakibara, T.
AU - Settai, R.
AU - Onuki, Y.
AU - Hiragi, M.
AU - Ichioka, Masanori
AU - Machida, K.
PY - 2010/1/22
Y1 - 2010/1/22
N2 - To identify the superconducting gap symmetry in CeCoIn5 (Tc=2.3K), we measured the angle-resolved specific heat (Cφ) in a field rotated around the c axis down to a very low temperature, 0.05Tc, and made detailed theoretical calculations. In a field of 1 T, a sign reversal of the fourfold angular oscillation in Cφ was observed at T≃0.1Tc upon entering a quasiclassical regime where the maximum of Cφ corresponds to the antinodal direction, coinciding with the angle-resolved density of states (ADOS) calculation. The Cφ behavior, which exhibits minima along the [110] directions, unambiguously allows us to conclude dx2-y2 symmetry of this system. The ADOS-quasiclassical region is confined to a narrow T and H domain within T/Tc∼0.1 and 1.5 T (0.13Hc2).
AB - To identify the superconducting gap symmetry in CeCoIn5 (Tc=2.3K), we measured the angle-resolved specific heat (Cφ) in a field rotated around the c axis down to a very low temperature, 0.05Tc, and made detailed theoretical calculations. In a field of 1 T, a sign reversal of the fourfold angular oscillation in Cφ was observed at T≃0.1Tc upon entering a quasiclassical regime where the maximum of Cφ corresponds to the antinodal direction, coinciding with the angle-resolved density of states (ADOS) calculation. The Cφ behavior, which exhibits minima along the [110] directions, unambiguously allows us to conclude dx2-y2 symmetry of this system. The ADOS-quasiclassical region is confined to a narrow T and H domain within T/Tc∼0.1 and 1.5 T (0.13Hc2).
UR - http://www.scopus.com/inward/record.url?scp=75149178022&partnerID=8YFLogxK
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U2 - 10.1103/PhysRevLett.104.037002
DO - 10.1103/PhysRevLett.104.037002
M3 - Article
AN - SCOPUS:75149178022
VL - 104
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 3
M1 - 037002
ER -