Spin Gap in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">HgBa</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow><mrow><msub><mrow><mi mathvariant="normal">Ca</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow><mrow><msub><mrow><mi mathvariant="normal">Cu</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow><mrow><msub><mrow><mi mathvariant="normal">O</mi></mrow><mrow><mn>8</mn><mo>+</mo><mi>δ</mi></mrow></msub></mrow></math></span> Single Crystals from <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>63</mn></mrow></msup></mrow></math></span>Cu NMR

M.-H. Julien; P. Carretta; M. Horvatić; C. Berthier; Y. Berthier; P. Ségransan; A. Carrington; D. Colson

doi:10.1103/PhysRevLett.76.4238

Spin Gap in ${HgBa}_{2} {Ca}_{2} {Cu}_{3} O_{8 + δ}$ Single Crystals from $^{63}$ Cu NMR

M.-H. Julien, P. Carretta, M. Horvatić, C. Berthier, Y. Berthier, P. Ségransan, A. Carrington, and D. Colson

Phys. Rev. Lett. 76, 4238 – Published 27 May 1996

Abstract

We report on $^{63} Cu$ NMR spectra, $T_{1}$ and $T_{2 G}$ measurements in single crystals of underdoped, three-layered, ${HgBa}_{2} {Ca}_{2} {Cu}_{3} O_{8 + δ}$ , with $T_{c} ≃ 115 K$ . We show clear evidence for the opening of a spin gap below $T^{*} ≃ 230 K$ , the highest temperature reported so far. Also, the characteristic energy of the spin fluctuations is found to be higher than in ${YBa}_{2} {Cu}_{3} O_{6 + x}$ ; both features are presumably related to the very high $T_{c}$ in this compound. Below $T^{*}$ , ${}^{63}T_{1}$ has the same temperature dependence in the three ${CuO}_{2}$ planes, which is difficult to explain within a pure interlayer spin pairing.

Received 17 October 1995

DOI:https://doi.org/10.1103/PhysRevLett.76.4238

Authors & Affiliations

M.-H. Julien¹, P. Carretta¹, M. Horvatić¹, C. Berthier^1,2, Y. Berthier², P. Ségransan², A. Carrington³, and D. Colson⁴

¹Grenoble High Magnetic Field Laboratory, Centre National de la Recherche Scientifique and Max-Planck-Institut für Festkörperforschung, Boîte Postale 166, 38042 Grenoble Cedex 9, France
²Laboratoire de Spectrométrie Physique, Université Joseph Fourier Grenoble 1 (URA 08 CNRS), Boîte Postale 87, 38402 Saint-Martin d'Hères Cedex, France
³Commissariat à l'Energie Atomique, Département de Recherche Fondamentale sur la Matière Condensée, Laboratoire de Cryophysique, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France
⁴Commissariat à l'Energie Atomique, Service de Physique de l'Etat Condensé, Saclay, 91191 Gif sur Yvette Cedex, France