Quantum Critical Kondo Quasiparticles Probed By Esr In β-ybalb 4

Abstract

Electron spin resonance (ESR) can probe conduction electrons (CE) and local moment (LM) spin systems in different materials. A CE spin resonance (CESR) is observed in metallic systems based on light elements or with enhanced Pauli susceptibility. LM ESR can be seen in compounds with paramagnetic ions and localized d or f electrons. Here we report a remarkable and unprecedented ESR signal in the heavy-fermion superconductor β-YbAlB4 which behaves as a CESR at high temperatures and acquires characteristics of the Yb3 LM ESR at low temperature. This dual behavior strikes as an in situ unique observation of the Kondo quasiparticles in a quantum critical regime. The proximity to a quantum critical point may favor the appearance of this dual character of the ESR signal in β-YbAlB4. © 2011 American Physical Society.1072Tien, C., Yu, J., Duh, H., (1993) Jpn. J. Appl. Phys., 32, p. 2658. , JAPNDE 0021-4922 10.1143/JJAP.32.2658Sichelschmidt, J., (2003) Phys. Rev. Lett., 91, p. 156401. , PRLTAO 0031-9007 10.1103/PhysRevLett.91.156401Sichelschmidt, J., (2007) J. Phys. Condens. Matter, 19, p. 016211. , JCOMEL 0953-8984 10.1088/0953-8984/19/1/016211Krellner, C., Forster, T., Jeevan, H., Geibel, C., Sichelschmidt, J., Relevance of ferromagnetic correlations for the electron spin resonance in kondo lattice systems (2008) Physical Review Letters, 100 (6), p. 066401. , http://oai.aps.org/oai?verb=GetRecord&Identifier=oai:aps.org: PhysRevLett.100.066401&metadataPrefix=oai_apsmeta_2, DOI 10.1103/PhysRevLett.100.066401Abrahams, E., Wolfle, P., (2008) Phys. Rev. B, 78, p. 104423. , PRBMDO 1098-0121 10.1103/PhysRevB.78.104423Schlottmann, P., (2009) Phys. Rev. B, 79, p. 045104. , PRBMDO 1098-0121 10.1103/PhysRevB.79.045104Macaluso, R.T., Nakatsuji, S., Kuga, K., Thomas, E.L., Machida, Y., Maeno, Y., Fisk, Z., Chan, J.Y., Crystal structure and physical properties of polymorphs of LnAlB 4 (Ln = Yb, Lu) (2007) Chemistry of Materials, 19 (8), pp. 1918-1922. , DOI 10.1021/cm062244+Nakatsuji, S., (2008) Nature Phys., 4, p. 603. , NPAHAX 1745-2473 10.1038/nphys1002Duque, J.G.S., (2009) Phys. Rev. B, 79, p. 035122. , PRBMDO 1098-0121 10.1103/PhysRevB.79.035122Trovarelli, O., (2000) Phys. Rev. Lett., 85, p. 626. , PRLTAO 0031-9007 10.1103/PhysRevLett.85.626Gegenwart, P., (2002) Phys. Rev. Lett., 89, p. 056402. , PRLTAO 0031-9007 10.1103/PhysRevLett.89.056402Dyson, F.J., (1955) Phys. Rev., 98, p. 349. , PHRVAO 0031-899X 10.1103/PhysRev.98.349Tao, L.J., (1971) Phys. Rev. B, 4, p. 5. , PRBMDO 0556-2805 10.1103/PhysRevB.4.5Abragam, A., Bleaney, B., (1970) EPR of Transitions Ions, , Clarendon, OxfordSattler, J.P., Nemarich, J., (1970) Phys. Rev. B, 1, p. 4249. , PRBMDO 0556-2805 10.1103/PhysRevB.1.4249Rettori, C., (1981) Physica (Amsterdam), 107, p. 359. , PHYBE3 0378-4363 10.1016/0378-4363(81)90485-XHuber, D.L., (2004) Phys. Rev. B, 70, p. 125417. , PRBMDO 1098-0121 10.1103/PhysRevB.70.125417Oseroff, S.B., (1977) Phys. Rev. B, 15, p. 1283. , PRBMDO 0556-2805 10.1103/PhysRevB.15.1283Continetino, M., (2005) Braz. J. Phys., 35, p. 197. , BJPHE6 0103-9733 10.1590/S0103-97332005000100018Coleman, P., Pepin, C., Si, Q., Ramazashvili, R., How do Fermi liquids get heavy and die? (2001) Journal of Physics Condensed Matter, 13 (35), pp. R723-R738. , DOI 10.1088/0953-8984/13/35/202, PII S095389840124853XMonod, P., (1978) J. Phys. (Paris), 39, pp. 6-1472. , JOPQAG 0302-0738 10.1051/jphyscol:19786589Rettori, C., (1997) Phys. Rev. B, 55, p. 1016. , PRBMDO 0163-1829 10.1103/PhysRevB.55.1016Pagliuso, P.G., (1997) Phys. Rev. B, 56, p. 8933. , PRBMDO 0163-1829 10.1103/PhysRevB.56.8933Urbano, R.R., (2002) Phys. Rev. Lett., 89, p. 087602. , PRLTAO 0031-9007 10.1103/PhysRevLett.89.087602Likodimos, V., Koutandos, S., Pissas, M., Papavassiliou, G., Prassides, K., Conduction electron spin resonance in Mg1-xAl xB2 (2003) Europhysics Letters, 61 (1), pp. 116-121. , DOI 10.1209/epl/i2003-00257-1Sercheli, M.S., Kopelevich, Y., Ricardo Da Silva, R., Torres, J.H.S., Rettori, C., Evidence for internal field in graphite: A conduction electron spin-resonance study (2002) Solid State Communications, 121 (9-10), pp. 579-583. , DOI 10.1016/S0038-1098(01)00465-3, PII S0038109801004653Walmsley, L., Rettori, C., C-Axis resistivity in graphite-AlCl3 as found by CESR measurements (1990) Synthetic Metals, 36 (2), pp. 235-239. , DOI 10.1016/0379-6779(90)90056-QPfluger, P., (1983) Synth. Met., 8, p. 15. , SYMEDZ 0379-6779 10.1016/0379-6779(83)90004-8Nevidomskyy, A.H., Coleman, P., (2009) Phys. Rev. Lett., 102, p. 077202. , PRLTAO 0031-9007 10.1103/PhysRevLett.102.077202Si, Q., Rabello, S., Ingersent, K., Smith, J.L., Locally critical quantum phase transitions in strongly correlated metals (2001) Nature, 413 (6858), pp. 804-808. , DOI 10.1038/3510150