SPECIFIC HEAT EVIDENCE ON THE NORMAL STATE PSEUDOGAP
UThe electronic specific heat of underdoped cuprates reveals an absence of spectral weight below a shoulder at the pseudogap energy E g. With hole doping additional spectral weight with entropy ∼ k B/added hole appears on the flanks of the gap and E g decreases as E g= J(1− p/ p crit), where J≈1300...
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| Published in: | The Journal of physics and chemistry of solids Vol. 59; no. 10; pp. 2091 - 2094 |
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| Main Authors: | , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Elsevier Ltd
01-10-1998
|
| Online Access: | Get full text |
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| Summary: | UThe electronic specific heat of underdoped cuprates reveals an absence of spectral weight below a shoulder at the pseudogap energy
E
g. With hole doping additional spectral weight with entropy ∼
k
B/added hole appears on the flanks of the gap and
E
g decreases as
E
g=
J(1−
p/
p
crit), where
J≈1300
K and
p
crit∼0.18/CuO
2 plane. This leads to an abrupt cross-over to metallic behaviour and strong superconductivity when the gap closes at
p
crit∼
Jγ
n
/
k
B. We conclude that
E
g(
p) reflects the energy scale of correlated holes and spins, and is not due to superconducting fluctuations or additional competing interactions. |
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| ISSN: | 0022-3697 1879-2553 |
| DOI: | 10.1016/S0022-3697(98)00180-2 |