TY - JOUR
T1 - How ‘pairons’ are revealed in the electronic specific heat of cuprates
AU - Noat, Yves
AU - Mauger, Alain
AU - Nohara, Minoru
AU - Eisaki, Hiroshi
AU - Sacks, William
N1 - Funding Information:
One of us (WS) is grateful for visiting researcher and professorship, at AIST Tsukuba and Okayama University respectively, during the first half of 2020. Support at AIST was provided by a JSPS FY2019 Invitational Fellowship for Research in Japan, and we acknowledge Professors Hideo Aoki, Shin-ichi Uchida and Kohji Kishio for very fruitful discussions.
Publisher Copyright:
© Elsevier Ltd
PY - 2021/1
Y1 - 2021/1
N2 - Understanding the thermodynamic properties of high-Tc cuprate superconductors is a key step to establish a satisfactory theory of these materials. The electronic specific heat is highly unconventional, distinctly non-BCS, with remarkable doping-dependent features extending well beyond Tc. The pairon concept, bound holes in their local antiferromagnetic environment, has successfully described the tunneling and photoemission spectra. In this article, we show that the model explains the distinctive features of the entropy and specific heat throughout the temperature-doping phase diagram. Their interpretation connects unambiguously the pseudogap, existing up to T*, to the superconducting state below Tc. In the underdoped case, the specific heat is dominated by pairon excitations, following Bose statistics, while with increasing doping, both bosonic excitations and fermionic quasiparticles coexist.
AB - Understanding the thermodynamic properties of high-Tc cuprate superconductors is a key step to establish a satisfactory theory of these materials. The electronic specific heat is highly unconventional, distinctly non-BCS, with remarkable doping-dependent features extending well beyond Tc. The pairon concept, bound holes in their local antiferromagnetic environment, has successfully described the tunneling and photoemission spectra. In this article, we show that the model explains the distinctive features of the entropy and specific heat throughout the temperature-doping phase diagram. Their interpretation connects unambiguously the pseudogap, existing up to T*, to the superconducting state below Tc. In the underdoped case, the specific heat is dominated by pairon excitations, following Bose statistics, while with increasing doping, both bosonic excitations and fermionic quasiparticles coexist.
KW - Cuprates superconductors
KW - Electronic specific heat
KW - High-temperature superconductors
KW - Pseudogap
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U2 - 10.1016/j.ssc.2020.114109
DO - 10.1016/j.ssc.2020.114109
M3 - Article
AN - SCOPUS:85096220139
VL - 323
JO - Solid State Communications
JF - Solid State Communications
SN - 0038-1098
M1 - 114109
ER -