1997
DOI: 10.1103/physrevlett.78.1992
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NMR Study of Carrier Doping Effects on Spin Gaps in the Spin LadderSr14xAx

Abstract: The discovery of high-T c superconductivity in lightly doped antiferromagnets has provided much interest in low-dimensional quantum spin systems. In order to obtain insight into the physics of the high-T c superconductivity, the Heisenberg spin-ladder systems, which consist of two (or more) chains of magnetic coupled ions, have been investigated intensively, since novel quantum phenomena appear in spin-ladder system [1-6]. The spin degree of freedom in the single ladder is well described by the Heisenberg Hami… Show more

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Cited by 109 publications
(57 citation statements)
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“…2 reveals the emergence of a zero temperature susceptibility which amounts to 53 % of the room temperature value. Our data at ambient pressure provide a confirmation for the depression of the spin gap upon doping, as previously announced in the Knight shift study of a Sr 5 Ca 9 Cu 24 O 41 single crystal [25] and also from T 1 data in the whole series corresponding to 0 ≤ x ≤ 9 [26]. However, what is remarkable in Fig.…”
Section: Resultssupporting
confidence: 89%
“…2 reveals the emergence of a zero temperature susceptibility which amounts to 53 % of the room temperature value. Our data at ambient pressure provide a confirmation for the depression of the spin gap upon doping, as previously announced in the Knight shift study of a Sr 5 Ca 9 Cu 24 O 41 single crystal [25] and also from T 1 data in the whole series corresponding to 0 ≤ x ≤ 9 [26]. However, what is remarkable in Fig.…”
Section: Resultssupporting
confidence: 89%
“…Up to now, the ground state of this spin-ladder superconductor in ambient pressure has not been well understood because of contradictive reports from different experimental methods. 9,10 Similar to the high temperature superconducting cuprates with 2D lattices, investigating the physics of the normal phase of Sr 14−x Ca x Cu 24 O 41 should provide a solid basis to understand the superconducting mechanism. Therefore, it is extremely important to reveal the physics of the normal state of this spin-ladder compound in order to find out the differences between Sr 14−x Ca x Cu 24 O 41 and other 2D superconductors, and further our understanding to their superconducting mechanisms.…”
Section: Introductionmentioning
confidence: 99%
“…16,17 On the theoretical side significant efforts were made to probe the possible existence of such a phase, either using numerical approaches [18][19][20] or starting from Mott insulating side. 21 As a way of investigating the physics of these states in a more controlled way and also in view of possible connections with experimental systems, [22][23][24][25][26] phases exhibiting orbital current patterns ͑OCP͒ were also considered in the context of two-leg ladders. 27,28 Indeed for this essentially onedimensional ͑1D͒ case, various analytical tools allow one to explore the consequences of such an unusual phase.…”
Section: Introductionmentioning
confidence: 99%