SR study of CeRhIn under applied pressure

高圧下におけるCeRhInのSRによる研究

Heffner, R.*; 後神 達郎*; Andreica, D.*; 大石 一城*; 髭本 亘  ; 伊藤 孝   ; Amato, A.*; Spehling, J.*; Klauss, H. H.*; Bauer, E. D.*; Thompson, J. D.*; 植村 泰朋*

Heffner, R.*; Goko, Tatsuo*; Andreica, D.*; Oishi, Kazuki*; Higemoto, Wataru; Ito, Takashi; Amato, A.*; Spehling, J.*; Klauss, H. H.*; Bauer, E. D.*; Thompson, J. D.*; Uemura, Yasutomo*

At ambient pressure CeRhIn is an incommensurate antiferromagnet with Neel temperature = 3.8 K. The application of pressure reduces and yields (1) a state in which AFM coexists with superconductivity, and then (2) a superconducting state in the absence of AFM. We report transverse-field muon spin relaxation (SR) measurements at pressures 2.07 and 2.26 GPa in the pure superconducting state of single-crystalline CeRhIn. SR is sensitive to the local field distribution produced by the vortex lattice in a mixed superconducting state, allowing a measurement of the magnetic field penetration depth . We measured for applied field along the -axis as a function of temperature , and find (0) = 372(5) nm and 338(6) nm for = 2.07 GPa and 2.26 GPa, respectively. The -dependence of the superfluid density was found to be with = 1.9(2).