Calorimetric determination of the magnetic phase diagram of underdoped ortho II YBa2Cu3O6.54 single crystals

被引：26
|
作者：
Marcenat, C. [1 ,2 ]
Demuer, A. [3 ,4 ]
Beauvois, K. [5 ,6 ]
Michon, B. [5 ,6 ]
Grockowiak, A. [7 ]
Liang, R. [8 ,9 ]
Hardy, W. [8 ,9 ]
Bonn, D. A. [8 ,9 ]
Klein, T. [5 ,6 ]
机构：
[1] Univ Grenoble Alpes, INAC SPSMS, F-38000 Grenoble, France
[2] CEA, INAC SPSMS, F-38000 Grenoble, France
[3] Univ Grenoble Alpes, LNCMI, F-38042 Grenoble, France
[4] CNRS, LNCMI, F-38042 Grenoble, France
[5] Univ Grenoble Alpes, Inst NEEL, F-38042 Grenoble, France
[6] CNRS, Inst NEEL, F-38042 Grenoble, France
[7] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA
[8] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada
[9] Canadian Inst Adv Res, Toronto, ON M5G 1Z8, Canada
来源：
NATURE COMMUNICATIONS | 2015年 / 6卷
关键词：
FERMI-SURFACE; CHARGE ORDER; STRIPE ORDER; FIELD; FLUCTUATIONS; TRANSITION; STATE; HEAT;
D O I：
10.1038/ncomms8927
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
The recent discovery of a charge order in underdoped YBa(2)Cu(3)Oy raised the question of the interplay between superconductivity and this competing phase. Understanding the normal state of high-temperature superconductors is now an essential step towards the description of the pairing mechanism in those materials and determining the upper critical field is therefore of fundamental importance. We present here a calorimetric determination of the field- temperature phase diagram in underdoped YBa(2)Cu(3)Oy single crystals. We show that the specific heat saturates in high magnetic fields. This saturation is consistent with a normal state without any significant superconducting contribution and a total Sommerfeld coefficient gamma(N)similar to 6.5 +/- 1.5 mJ mol(-1) K-2 putting strong constraints on the theoretical models for the Fermi surface reconstruction.
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页数：5
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