Experimental evidence for two-dimensional magnetic order in proton bombarded graphite

被引：102
作者：
Barzola-Quiquia, J. [1 ]
Esquinazi, P. [1 ]
Rothermel, M. [1 ]
Spemann, D. [1 ]
Butz, T. [1 ]
Garcia, N. [2 ]
机构：
[1] Univ Leipzig, Inst Expt Phys 2, D-04103 Leipzig, Germany
[2] Consejo Super Invest Cientif, Lab Fis Sistemas Pequenos & Nanotecnol, E-28006 Madrid, Spain
来源：
PHYSICAL REVIEW B | 2007年 / 76卷 / 16期
关键词：
D O I：
10.1103/PhysRevB.76.161403
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have bombarded graphite samples with protons at low temperatures and low fluences to attenuate the large thermal annealing produced during irradiation. The overall optimization of sample handling allowed us to find Curie temperatures T-c greater than or similar to 350 K at the fluences used. The magnetization versus temperature shows unequivocally a linear dependence, which can be interpreted as due to excitations of spin waves in a two-dimensional Heisenberg model with a weak uniaxial anisotropy.
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页数：4
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共 27 条
  • [1] Proton-induced magnetic order in carbon: SQUID measurements
    Barzola-Quiquia, J.
    Esquinazi, P.
    Rothermel, M.
    Spemann, D.
    Setzer, A.
    Butz, T.
    [J]. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 2007, 256 (01) : 412 - 418
  • [2] SPONTANEOUS BREAKDOWN OF CONTINUOUS SYMMETRIES NEAR 2 DIMENSIONS
    BREZIN, E
    ZINNJUSTIN, J
    [J]. PHYSICAL REVIEW B, 1976, 14 (07) : 3110 - 3120
  • [3] DORING W, 1961, Z NATURFORSCH PT A, VA 16, P1008
  • [4] Induced magnetic ordering by proton irradiation in graphite -: art. no. 227201
    Esquinazi, P
    Spemann, D
    Höhne, R
    Setzer, A
    Han, KH
    Butz, T
    [J]. PHYSICAL REVIEW LETTERS, 2003, 91 (22)
  • [5] Esquinazi P, 2002, PHYS REV B, V66, DOI 10.1103/PhysRevB.66.024429
  • [6] Ferromagnetic spots in graphite produced by proton irradiation
    Han, KH
    Spemann, D
    Esquinazi, P
    Höhne, R
    Riede, V
    Butz, T
    [J]. ADVANCED MATERIALS, 2003, 15 (20) : 1719 - +
  • [7] SPIN-WAVES IN A FERROMAGNET WITH RANDOMLY DISORDERED BONDS
    JONES, RC
    YATES, GJ
    [J]. JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1975, 8 (11): : 1705 - 1717
  • [8] Graphene: carbon in two dimensions
    Katsnelson, Mikhail I.
    [J]. MATERIALS TODAY, 2007, 10 (1-2) : 20 - 27
  • [9] Integer quantum Hall effect in graphite
    Kempa, H
    Esquinazi, P
    Kopelevich, Y
    [J]. SOLID STATE COMMUNICATIONS, 2006, 138 (03) : 118 - 122
  • [10] Magnetic-field-driven superconductor-insulator-type transition in graphite
    Kempa, H
    Kopelevich, Y
    Mrowka, F
    Setzer, A
    Torres, JHS
    Höhne, R
    Esquinazi, P
    [J]. SOLID STATE COMMUNICATIONS, 2000, 115 (10) : 539 - 542
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