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Volumn 80, Issue 10, 2011, Pages

Suppression of superconductivity by nonmagnetic disorder in organic superconductor κ-(BEDT-TTF)2Cu(NCS)2

Author keywords

(BEDT TTF) 2Cu(NCS)2; De Haas van Alphen oscillations; Disorder effect; Organic superconductor; Scattering time; X ray irradiation

Indexed keywords


EID: 80053585726     PISSN: 00319015     EISSN: 13474073     Source Type: Journal    
DOI: 10.1143/JPSJ.80.104703     Document Type: Article
Times cited : (17)

References (80)
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    • Note
    • The lattice parameters of-[(h-BEDT-TTF)1-x(h-BMDT-TTF)x]2- Cu(NCS)2 with x = 0:1 at room temperature are as follows: monoclinic, space group P21, a = 16:25-16:248-A, b = 8:46-8:440-A , c = 13:14-13:124-A, = 110:2 -110:30 , and Z = 2. For comparison with those of a nonsubstituted sample of x = 0, the parameters of-(BEDT-TTF)2Cu(NCS)2 reported by Urayama et al.25) are shown in parentheses. There is almost no difference in the lattice parameters induced by the BMDT-TTF molecule substitution within the present measurement accuracy.
  • 31
    • 80053598752 scopus 로고    scopus 로고
    • Note
    • The magnetic susceptibility measurements of the X-ray-irradiated-(h-BEDT- TTF)2Cu(NCS)2 showed only Pauli paramagnetism with weak Curie-like behavior at low temperatures below 10 K. The Curielike behavior may appear owing to the molecular defects introduced by X-ray irradiation. The concentration of the impurity spins (S = 1=2) is estimated to be approximately 0.05% per formula unit after 467 h of X-ray irradiation. This value is in agreement with the ESR measurements of the X-ray-irradiated-(BEDT-TTF)2Cu- [N(CN)2]Cl.66) The magnetic torque curves in the normal state at higher magnetic fields indicated only paramagnetic behavior at low temperatures, as shown in Fig. 3(b). The samples with partial BMDTTTF molecule substitution showed no detectable change in the paramagnetic behavior from the pristine sample.
  • 35
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    • 1(d), the demagnetization factor may change slightly, probably owing to the rounded crystal edge in the course of the repeat experiments of the X-ray irradiation at room temperature and the magnetization measurements at low temperatures for the same crystal
    • In the case of the X-ray-irradiated sample shown in Fig. 1(d), the demagnetization factor may change slightly, probably owing to the rounded crystal edge in the course of the repeat experiments of the X-ray irradiation at room temperature and the magnetization measurements at low temperatures for the same crystal.
    • The Case of the X-ray-irradiated Sample Shown in Fig
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    • Ch. Strack, C. Akinci, V. Pashchenko, B. Wolf, E. Uhrig, W. Assmus, M. Lang, J. Schreuer, L. Wiehl, J. A. Schlueter, J. Wosnitza, D. Schweitzer, J. Mü ller, and J. Wykhoff: Phys. Rev. B 72 (2005) 054511.
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    • Note
    • Hydrostatic pressures applied to the pristine sample lower Tc by approximately 4 K/kbar concurrently with a 3% increase in F and a 14% decrease in m for the -orbit.51,55) It seems reasonable to suppose here that the nature of the -orbit, which is another orbit of the Fermi surface, does not change so much, similarly to the -orbit, although the -orbit is not observed as the magnetic breakdown -orbit. This is because both the - and -orbits originate from the same degenerated band. No change in m and a small decrease in F in the -orbit of the present samples with the introduction of disorder indicate that we can reasonably exclude the possibility of significant modulation of the electronic states at the Fermi level as the origin of the large decrease in Tc.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.